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Else statement executing when it shouldnt

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  Else statement executing when it shouldnt eli m <techgeek201@gmail.com> - 2013-01-20 20:40 -0800
    Re: Else statement executing when it shouldnt Roy Smith <roy@panix.com> - 2013-01-20 23:47 -0500
    Re: Else statement executing when it shouldnt Chris Angelico <rosuav@gmail.com> - 2013-01-21 15:52 +1100
      Re: Else statement executing when it shouldnt eli m <techgeek201@gmail.com> - 2013-01-20 20:55 -0800
      Re: Else statement executing when it shouldnt eli m <techgeek201@gmail.com> - 2013-01-20 20:55 -0800
    Re: Else statement executing when it shouldnt eli m <techgeek201@gmail.com> - 2013-01-20 20:54 -0800
      Re: Else statement executing when it shouldnt alex23 <wuwei23@gmail.com> - 2013-01-20 22:00 -0800
        Re: Else statement executing when it shouldnt Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-01-21 08:04 +0000
    Re: Else statement executing when it shouldnt René Klačan <rene.klacan@gmail.com> - 2013-01-21 05:54 +0100
      Re: Else statement executing when it shouldnt eli m <techgeek201@gmail.com> - 2013-01-20 20:57 -0800
        Re: Else statement executing when it shouldnt René Klačan <rene.klacan@gmail.com> - 2013-01-21 06:06 +0100
        Re: Else statement executing when it shouldnt René Klačan <rene.klacan@gmail.com> - 2013-01-21 06:07 +0100
          Re: Else statement executing when it shouldnt Thomas Boell <tboell@domain.invalid> - 2013-01-22 16:39 +0100
            Re: Else statement executing when it shouldnt Chris Angelico <rosuav@gmail.com> - 2013-01-23 02:42 +1100
              Re: Else statement executing when it shouldnt Thomas Boell <tboell@domain.invalid> - 2013-01-22 16:48 +0100
                Re: Else statement executing when it shouldnt Chris Angelico <rosuav@gmail.com> - 2013-01-23 03:07 +1100
                Re: Else statement executing when it shouldnt Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-01-22 23:22 +0000
                  Re: Else statement executing when it shouldnt René Klačan <rene.klacan@gmail.com> - 2013-01-23 01:34 +0100
                  Re: Else statement executing when it shouldnt Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-01-22 22:11 -0500
                Re: Else statement executing when it shouldnt alex23 <wuwei23@gmail.com> - 2013-01-22 17:28 -0800
                  Re: Else statement executing when it shouldnt Thomas Boell <tboell@domain.invalid> - 2013-01-23 12:22 +0100
                    Re: Else statement executing when it shouldnt Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2013-01-23 15:35 +0200
                      Re: Else statement executing when it shouldnt Jerry Hill <malaclypse2@gmail.com> - 2013-01-23 09:53 -0500
                      Re: Else statement executing when it shouldnt Frank Millman <frank@chagford.com> - 2013-01-25 10:15 +0200
            Re: Else statement executing when it shouldnt Duncan Booth <duncan.booth@invalid.invalid> - 2013-01-22 15:48 +0000
              Re: Else statement executing when it shouldnt Duncan Booth <duncan.booth@invalid.invalid> - 2013-01-22 15:52 +0000
      Re: Else statement executing when it shouldnt eli m <techgeek201@gmail.com> - 2013-01-20 20:57 -0800
    Re: Else statement executing when it shouldnt Mitya Sirenef <msirenef@lightbird.net> - 2013-01-20 23:57 -0500
      Re: Else statement executing when it shouldnt eli m <techgeek201@gmail.com> - 2013-01-20 20:59 -0800
        Re: Else statement executing when it shouldnt Mitya Sirenef <msirenef@lightbird.net> - 2013-01-21 01:09 -0500
      Re: Else statement executing when it shouldnt eli m <techgeek201@gmail.com> - 2013-01-20 20:59 -0800
        Re: Else statement executing when it shouldnt alex23 <wuwei23@gmail.com> - 2013-01-20 21:46 -0800
    Re: Else statement executing when it shouldnt alex23 <wuwei23@gmail.com> - 2013-01-20 21:56 -0800
      Re: Else statement executing when it shouldnt eli m <techgeek201@gmail.com> - 2013-01-21 07:37 -0800
        Re: Else statement executing when it shouldnt Chris Angelico <rosuav@gmail.com> - 2013-01-22 05:44 +1100

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#37138 — Else statement executing when it shouldnt

an else statement is running when it shouldnt be. It is on the last line. Whenever i am in the math or game function, when i type in main, it goes back to the start of the program, but it also says not a valid function. I am stumped!
Here is my code:
#Cmd 
#Created By Eli M.
#import modules
import random
import math
gtn = 0
print ("Type in help for a list of cmd functions")
#initiate main loop
cmd = 0
while cmd == 0:
#ask for input on function
    function = raw_input("Type in a function:")
    #start math loop
    if function == "math":
        run = 0
        while run == 0:
            #ask for math operation
            type = raw_input("What math operation do you want to use?")
            if type == "multiplication":
                x = raw_input("Type in your first number:")
                y = raw_input("Multiply your first number by:")
                try:
                    ans = int(x) * int(y)
                    print (ans)
                    try:
                        ans = float(x) * float(y)
                        print (ans)
                    except ValueError, err:
                        print ("Not a valid number")
                except OverflowError, err:
                    print ("Number too large")
            #division math function
            if type == "division":
                x = raw_input("Type in your first number:")
                y = raw_input("Divide your first number by:")
                try:
                    ans = float(x) / float(y)
                    print (ans)
                except ZeroDivisionError, err:
                    print ("Can't divide by zero")
                except ValueError, err:
                    print ("Not a valid number")
                except OverflowError, err:
                    print ("Number too large")
                    #subtraction math function
            if type == "subtraction":
                x = raw_input("Type in your first number:")
                y = raw_input("Subtract your first number by:")
                try:
                    ans = float(x) - float(y)
                    print (ans)
                except ValueError, err:
                    print ("Not a valid number")
            #addition math function
            if type == "addition":
                x = raw_input("Type in your first number:")
                y = raw_input("Add your first number by:")
                try:
                    ans = float(x) + float(y)
                    print (ans)
                except ValueError, err:
                    try:
                        ans = int(x) + int(y)
                        print (ans)
                    except ValueError, err:
                        print ("Not a valid number")
                except OverflowError, err:
                    print ("Number too large")
            #square root math function
            if type == "square root":
                x = raw_input("Type in your number:")
                try:
                    y = float(x)
                    z = math.sqrt(y)
                    print (z)
                except ValueError, err:
                    print ("Not a valid number")
                except OverflowError, err:
                    print ("Number too large")
            
            #to the power of... math function
            if type == "power":
                    x = raw_input("Type in your number:")
                    y = raw_input("Multiply your first number by the power of:")
                    try:
                        ans = float(x) ** float(y)
                        print (ans)
                    except OverflowError, err:
                        print ("Number too large")
                    except ValueError, err:
                        print ("Not a valid number")
            #break the math loop
            if type == "main":
                run = 1
            #absolute value math function
            if type == "absolute value":
                try:
                    x = float(raw_input("Type in your number:"))
                    y = math.fabs(x)
                    print (y)
                except ValueError, err:
                    print ("Not a valid number")
    if function == "random number":
        try:
            x = int(raw_input("Minimum number:"))
            y = int(raw_input("Maximum number:"))
            num = random.randint(x, y)
            print (num)
        except ValueError, err:
            print ("Not a valid number")
    if function == "games":
        games = 0
        while games == 0:
            gamechoice = raw_input("What game do you want to play:")
            if gamechoice == "guess the number":
                run = 0
                while run == 0:
                    print ("I am thinking of a number between 1 and 20")
                    num = random.randint(1, 20)
                    num = int(num)
                    guesses = 0
                    guessestaken = 0
                    while guesses == 0:
                        try:
                            guess = raw_input("Your guess:")
                            guess = int(guess)
                            guessestaken = (guessestaken) + 1
                            guessestaken = int(guessestaken)
                            if guess == (num):
                                print 'Correct! It took you', int(guessestaken), 'guesses!'
                                playagain = raw_input("Do you want to play again?")
                                if playagain == "yes":
                                    guesses = 1
                                if playagain == "no":
                                    run = 1
                                    guesses = 1
                            if guess > num:
                                print ("My number is lower")
                            if guess < num:
                                print ("My number is higher")
                        except TypeError, err:
                            print ("Not a valid number")
            if gamechoice == "main":
                games = 1
            
    #help function
    if function == "help":
        helpfunc = 0
        while helpfunc == 0:
            #show functions
            print ("Functions:")
            print ("Math: multiplication, division, subtraction, addition, square root, power, absolute value")
            print ("Random Number")
            print ("Games: Guess the number")
            helpmain = raw_input("Type in main to go back")
            if helpmain == "main":
                #end helpfunction loop
                helpfunc = 1
                cmd = 0     
	else:
		print ("Not a valid function")

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#37140

In article <2cc6791f-ba56-406c-a5b0-b23023caf4bb@googlegroups.com>,
 eli m <techgeek201@gmail.com> wrote:

> an else statement is running when it shouldnt be. It is on the last line. 
> Whenever i am in the math or game function, when i type in main, it goes back 
> to the start of the program, but it also says not a valid function. I am 
> stumped!
> Here is my code:

[many lines of code elided]

TL;DNR :-)

A basic debugging technique is to try to find the minimum amount of code 
that can reproduce the problem.

Find some hunk of lines that you're pretty sure can't be at fault, and 
delete them.  See if you can still reproduce the problem.  Assuming you 
can, delete another hunk of code.  Keep going until you're down to the 
smallest possible amount of code which demonstrates the problem.

There's a couple of good things that come out of this.  One is that it's 
likely that in the course of doing this, you'll figure out what's wrong.  
The other is that if you can't figure it out, at least now you'll have 
something that's easy to show somebody else when you ask for help.

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#37141

On Mon, Jan 21, 2013 at 3:40 PM, eli m <techgeek201@gmail.com> wrote:
> an else statement is running when it shouldnt be. It is on the last line. Whenever i am in the math or game function, when i type in main, it goes back to the start of the program, but it also says not a valid function. I am stumped!

Check your indentation levels. I see a few things here that look odd:

>     if function == "help":
>         while helpfunc == 0:
>             if helpmain == "main":
>         else:

What is the else meant to bind to? The innermost if? The 'if function
== "help"'? It's currently binding to the while.

Recommendation: Break this up! Your main loop is huge! It's way too
easy to get lost in it. And while you're at it, consider unifying some
of the similar blocks of code. The solution to both issues is simple:
Use functions. Have you been taught about them yet?

Also, side tip: Be honest about homework. I'm fairly sure that's what
this is. :)

ChrisA

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#37144

On Sunday, January 20, 2013 8:52:12 PM UTC-8, Chris Angelico wrote:
> On Mon, Jan 21, 2013 at 3:40 PM, eli m <techgeek201@gmail.com> wrote:
> 
> > an else statement is running when it shouldnt be. It is on the last line. Whenever i am in the math or game function, when i type in main, it goes back to the start of the program, but it also says not a valid function. I am stumped!
> 
> 
> 
> Check your indentation levels. I see a few things here that look odd:
> 
> 
> 
> >     if function == "help":
> 
> >         while helpfunc == 0:
> 
> >             if helpmain == "main":
> 
> >         else:
> 
> 
> 
> What is the else meant to bind to? The innermost if? The 'if function
> 
> == "help"'? It's currently binding to the while.
> 
> 
> 
> Recommendation: Break this up! Your main loop is huge! It's way too
> 
> easy to get lost in it. And while you're at it, consider unifying some
> 
> of the similar blocks of code. The solution to both issues is simple:
> 
> Use functions. Have you been taught about them yet?
> 
> 
> 
> Also, side tip: Be honest about homework. I'm fairly sure that's what
> 
> this is. :)
> 
> 
> 
> ChrisA

Its not homework. It is a personal project.

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#37150

On Sunday, January 20, 2013 8:52:12 PM UTC-8, Chris Angelico wrote:
> On Mon, Jan 21, 2013 at 3:40 PM, eli m <techgeek201@gmail.com> wrote:
> 
> > an else statement is running when it shouldnt be. It is on the last line. Whenever i am in the math or game function, when i type in main, it goes back to the start of the program, but it also says not a valid function. I am stumped!
> 
> 
> 
> Check your indentation levels. I see a few things here that look odd:
> 
> 
> 
> >     if function == "help":
> 
> >         while helpfunc == 0:
> 
> >             if helpmain == "main":
> 
> >         else:
> 
> 
> 
> What is the else meant to bind to? The innermost if? The 'if function
> 
> == "help"'? It's currently binding to the while.
> 
> 
> 
> Recommendation: Break this up! Your main loop is huge! It's way too
> 
> easy to get lost in it. And while you're at it, consider unifying some
> 
> of the similar blocks of code. The solution to both issues is simple:
> 
> Use functions. Have you been taught about them yet?
> 
> 
> 
> Also, side tip: Be honest about homework. I'm fairly sure that's what
> 
> this is. :)
> 
> 
> 
> ChrisA

Its not homework. It is a personal project.

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#37142

On Sunday, January 20, 2013 8:40:47 PM UTC-8, eli m wrote:
hint: Use the comments in the code to find out where my error is.
> 
> Here is my code:
> 
> #Cmd 
> 
> #Created By Eli M.
> 
> #import modules
> 
> import random
> 
> import math
> 
> gtn = 0
> 
> print ("Type in help for a list of cmd functions")
> 
> #initiate main loop
> 
> cmd = 0
> 
> while cmd == 0:
> 
> #ask for input on function
> 
>     function = raw_input("Type in a function:")
> 
>     #start math loop
> 
>     if function == "math":
> 
>         run = 0
> 
>         while run == 0:
> 
>             #ask for math operation
> 
>             type = raw_input("What math operation do you want to use?")
> 
>             if type == "multiplication":
> 
>                 x = raw_input("Type in your first number:")
> 
>                 y = raw_input("Multiply your first number by:")
> 
>                 try:
> 
>                     ans = int(x) * int(y)
> 
>                     print (ans)
> 
>                     try:
> 
>                         ans = float(x) * float(y)
> 
>                         print (ans)
> 
>                     except ValueError, err:
> 
>                         print ("Not a valid number")
> 
>                 except OverflowError, err:
> 
>                     print ("Number too large")
> 
>             #division math function
> 
>             if type == "division":
> 
>                 x = raw_input("Type in your first number:")
> 
>                 y = raw_input("Divide your first number by:")
> 
>                 try:
> 
>                     ans = float(x) / float(y)
> 
>                     print (ans)
> 
>                 except ZeroDivisionError, err:
> 
>                     print ("Can't divide by zero")
> 
>                 except ValueError, err:
> 
>                     print ("Not a valid number")
> 
>                 except OverflowError, err:
> 
>                     print ("Number too large")
> 
>                     #subtraction math function
> 
>             if type == "subtraction":
> 
>                 x = raw_input("Type in your first number:")
> 
>                 y = raw_input("Subtract your first number by:")
> 
>                 try:
> 
>                     ans = float(x) - float(y)
> 
>                     print (ans)
> 
>                 except ValueError, err:
> 
>                     print ("Not a valid number")
> 
>             #addition math function
> 
>             if type == "addition":
> 
>                 x = raw_input("Type in your first number:")
> 
>                 y = raw_input("Add your first number by:")
> 
>                 try:
> 
>                     ans = float(x) + float(y)
> 
>                     print (ans)
> 
>                 except ValueError, err:
> 
>                     try:
> 
>                         ans = int(x) + int(y)
> 
>                         print (ans)
> 
>                     except ValueError, err:
> 
>                         print ("Not a valid number")
> 
>                 except OverflowError, err:
> 
>                     print ("Number too large")
> 
>             #square root math function
> 
>             if type == "square root":
> 
>                 x = raw_input("Type in your number:")
> 
>                 try:
> 
>                     y = float(x)
> 
>                     z = math.sqrt(y)
> 
>                     print (z)
> 
>                 except ValueError, err:
> 
>                     print ("Not a valid number")
> 
>                 except OverflowError, err:
> 
>                     print ("Number too large")
> 
>             
> 
>             #to the power of... math function
> 
>             if type == "power":
> 
>                     x = raw_input("Type in your number:")
> 
>                     y = raw_input("Multiply your first number by the power of:")
> 
>                     try:
> 
>                         ans = float(x) ** float(y)
> 
>                         print (ans)
> 
>                     except OverflowError, err:
> 
>                         print ("Number too large")
> 
>                     except ValueError, err:
> 
>                         print ("Not a valid number")
> 
>             #break the math loop
> 
>             if type == "main":
> 
>                 run = 1
> 
>             #absolute value math function
> 
>             if type == "absolute value":
> 
>                 try:
> 
>                     x = float(raw_input("Type in your number:"))
> 
>                     y = math.fabs(x)
> 
>                     print (y)
> 
>                 except ValueError, err:
> 
>                     print ("Not a valid number")
> 
>     if function == "random number":
> 
>         try:
> 
>             x = int(raw_input("Minimum number:"))
> 
>             y = int(raw_input("Maximum number:"))
> 
>             num = random.randint(x, y)
> 
>             print (num)
> 
>         except ValueError, err:
> 
>             print ("Not a valid number")
> 
>     if function == "games":
> 
>         games = 0
> 
>         while games == 0:
> 
>             gamechoice = raw_input("What game do you want to play:")
> 
>             if gamechoice == "guess the number":
> 
>                 run = 0
> 
>                 while run == 0:
> 
>                     print ("I am thinking of a number between 1 and 20")
> 
>                     num = random.randint(1, 20)
> 
>                     num = int(num)
> 
>                     guesses = 0
> 
>                     guessestaken = 0
> 
>                     while guesses == 0:
> 
>                         try:
> 
>                             guess = raw_input("Your guess:")
> 
>                             guess = int(guess)
> 
>                             guessestaken = (guessestaken) + 1
> 
>                             guessestaken = int(guessestaken)
> 
>                             if guess == (num):
> 
>                                 print 'Correct! It took you', int(guessestaken), 'guesses!'
> 
>                                 playagain = raw_input("Do you want to play again?")
> 
>                                 if playagain == "yes":
> 
>                                     guesses = 1
> 
>                                 if playagain == "no":
> 
>                                     run = 1
> 
>                                     guesses = 1
> 
>                             if guess > num:
> 
>                                 print ("My number is lower")
> 
>                             if guess < num:
> 
>                                 print ("My number is higher")
> 
>                         except TypeError, err:
> 
>                             print ("Not a valid number")
> 
>             if gamechoice == "main":
> 
>                 games = 1
> 
>             
> 
>     #help function
> 
>     if function == "help":
> 
>         helpfunc = 0
> 
>         while helpfunc == 0:
> 
>             #show functions
> 
>             print ("Functions:")
> 
>             print ("Math: multiplication, division, subtraction, addition, square root, power, absolute value")
> 
>             print ("Random Number")
> 
>             print ("Games: Guess the number")
> 
>             helpmain = raw_input("Type in main to go back")
> 
>             if helpmain == "main":
> 
>                 #end helpfunction loop
> 
>                 helpfunc = 1
> 
>                 cmd = 0     
> 
> 	else:
> 
> 		print ("Not a valid function")

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#37156

On Jan 21, 2:54 pm, eli m <techgeek...@gmail.com> wrote:
> hint: Use the comments in the code to find out where my error is.

Pro-tip: when people you're asking for help tell you how you can make
it easier for them to help you, a snide response isn't the correct
approach.

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#37165

On Sun, 20 Jan 2013 22:00:10 -0800, alex23 wrote:

> On Jan 21, 2:54 pm, eli m <techgeek...@gmail.com> wrote:
>> hint: Use the comments in the code to find out where my error is.
> 
> Pro-tip: when people you're asking for help tell you how you can make it
> easier for them to help you, a snide response isn't the correct
> approach.

Alex, thank you for saying this. I can now delete my *much* less polite 
version saying the same thing.




-- 
Steven

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#37143

[Multipart message — attachments visible in raw view] — view raw

You have to break while loop not to execute else branch

Rene

On Mon, Jan 21, 2013 at 5:40 AM, eli m <techgeek201@gmail.com> wrote:

> an else statement is running when it shouldnt be. It is on the last line.
> Whenever i am in the math or game function, when i type in main, it goes
> back to the start of the program, but it also says not a valid function. I
> am stumped!
> Here is my code:
> #Cmd
> #Created By Eli M.
> #import modules
> import random
> import math
> gtn = 0
> print ("Type in help for a list of cmd functions")
> #initiate main loop
> cmd = 0
> while cmd == 0:
> #ask for input on function
>     function = raw_input("Type in a function:")
>     #start math loop
>     if function == "math":
>         run = 0
>         while run == 0:
>             #ask for math operation
>             type = raw_input("What math operation do you want to use?")
>             if type == "multiplication":
>                 x = raw_input("Type in your first number:")
>                 y = raw_input("Multiply your first number by:")
>                 try:
>                     ans = int(x) * int(y)
>                     print (ans)
>                     try:
>                         ans = float(x) * float(y)
>                         print (ans)
>                     except ValueError, err:
>                         print ("Not a valid number")
>                 except OverflowError, err:
>                     print ("Number too large")
>             #division math function
>             if type == "division":
>                 x = raw_input("Type in your first number:")
>                 y = raw_input("Divide your first number by:")
>                 try:
>                     ans = float(x) / float(y)
>                     print (ans)
>                 except ZeroDivisionError, err:
>                     print ("Can't divide by zero")
>                 except ValueError, err:
>                     print ("Not a valid number")
>                 except OverflowError, err:
>                     print ("Number too large")
>                     #subtraction math function
>             if type == "subtraction":
>                 x = raw_input("Type in your first number:")
>                 y = raw_input("Subtract your first number by:")
>                 try:
>                     ans = float(x) - float(y)
>                     print (ans)
>                 except ValueError, err:
>                     print ("Not a valid number")
>             #addition math function
>             if type == "addition":
>                 x = raw_input("Type in your first number:")
>                 y = raw_input("Add your first number by:")
>                 try:
>                     ans = float(x) + float(y)
>                     print (ans)
>                 except ValueError, err:
>                     try:
>                         ans = int(x) + int(y)
>                         print (ans)
>                     except ValueError, err:
>                         print ("Not a valid number")
>                 except OverflowError, err:
>                     print ("Number too large")
>             #square root math function
>             if type == "square root":
>                 x = raw_input("Type in your number:")
>                 try:
>                     y = float(x)
>                     z = math.sqrt(y)
>                     print (z)
>                 except ValueError, err:
>                     print ("Not a valid number")
>                 except OverflowError, err:
>                     print ("Number too large")
>
>             #to the power of... math function
>             if type == "power":
>                     x = raw_input("Type in your number:")
>                     y = raw_input("Multiply your first number by the power
> of:")
>                     try:
>                         ans = float(x) ** float(y)
>                         print (ans)
>                     except OverflowError, err:
>                         print ("Number too large")
>                     except ValueError, err:
>                         print ("Not a valid number")
>             #break the math loop
>             if type == "main":
>                 run = 1
>             #absolute value math function
>             if type == "absolute value":
>                 try:
>                     x = float(raw_input("Type in your number:"))
>                     y = math.fabs(x)
>                     print (y)
>                 except ValueError, err:
>                     print ("Not a valid number")
>     if function == "random number":
>         try:
>             x = int(raw_input("Minimum number:"))
>             y = int(raw_input("Maximum number:"))
>             num = random.randint(x, y)
>             print (num)
>         except ValueError, err:
>             print ("Not a valid number")
>     if function == "games":
>         games = 0
>         while games == 0:
>             gamechoice = raw_input("What game do you want to play:")
>             if gamechoice == "guess the number":
>                 run = 0
>                 while run == 0:
>                     print ("I am thinking of a number between 1 and 20")
>                     num = random.randint(1, 20)
>                     num = int(num)
>                     guesses = 0
>                     guessestaken = 0
>                     while guesses == 0:
>                         try:
>                             guess = raw_input("Your guess:")
>                             guess = int(guess)
>                             guessestaken = (guessestaken) + 1
>                             guessestaken = int(guessestaken)
>                             if guess == (num):
>                                 print 'Correct! It took you',
> int(guessestaken), 'guesses!'
>                                 playagain = raw_input("Do you want to play
> again?")
>                                 if playagain == "yes":
>                                     guesses = 1
>                                 if playagain == "no":
>                                     run = 1
>                                     guesses = 1
>                             if guess > num:
>                                 print ("My number is lower")
>                             if guess < num:
>                                 print ("My number is higher")
>                         except TypeError, err:
>                             print ("Not a valid number")
>             if gamechoice == "main":
>                 games = 1
>
>     #help function
>     if function == "help":
>         helpfunc = 0
>         while helpfunc == 0:
>             #show functions
>             print ("Functions:")
>             print ("Math: multiplication, division, subtraction, addition,
> square root, power, absolute value")
>             print ("Random Number")
>             print ("Games: Guess the number")
>             helpmain = raw_input("Type in main to go back")
>             if helpmain == "main":
>                 #end helpfunction loop
>                 helpfunc = 1
>                 cmd = 0
>         else:
>                 print ("Not a valid function")
> --
> http://mail.python.org/mailman/listinfo/python-list
>

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#37146

On Sunday, January 20, 2013 8:54:13 PM UTC-8, René Klačan wrote:
> You have to break while loop not to execute else branch
> 
> 
> Rene
> 
> 
> 
Can you explain in more detail please.

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#37151

[Multipart message — attachments visible in raw view] — view raw

Examples:

# else branch will be executed
i = 0
while i < 5:
    i += 1
else:
    print('loop is over')


# else branch will be executed
i = 0
while i < 5:
    i += 1
    if i == 7:
        print('i == 7')
        break
else:
    print('loop is over')


# else branch wont be executed
i = 0
while i < 5:
    i += 1
    if i == 3:
        print('i == 3')
        break
else:
    print('loop is over')

On Mon, Jan 21, 2013 at 5:57 AM, eli m <techgeek201@gmail.com> wrote:

> On Sunday, January 20, 2013 8:54:13 PM UTC-8, René Klačan wrote:
> > You have to break while loop not to execute else branch
> >
> >
> > Rene
> >
> >
> >
> Can you explain in more detail please.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

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#37152

[Multipart message — attachments visible in raw view] — view raw

Examples:

# else branch will be executed
i = 0
while i < 5:
    i += 1
else:
    print('loop is over')


# else branch will be executed
i = 0
while i < 5:
    i += 1
    if i == 7:
        print('i == 7')
        break
else:
    print('loop is over')


# else branch wont be executed
i = 0
while i < 5:
    i += 1
    if i == 3:
        print('i == 3')
        break
else:
    print('loop is over')

On Mon, Jan 21, 2013 at 5:57 AM, eli m <techgeek201@gmail.com> wrote:

> On Sunday, January 20, 2013 8:54:13 PM UTC-8, René Klačan wrote:
> > You have to break while loop not to execute else branch
> >
> >
> > Rene
> >
> >
> >
> Can you explain in more detail please.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

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#37287

On Mon, 21 Jan 2013 06:07:08 +0100
René Klačan <rene.klacan@gmail.com> wrote:

> Examples:
> 
> # else branch will be executed
> i = 0
> while i < 5:
>     i += 1
> else:
>     print('loop is over')
> 
> 
> # else branch will be executed
> i = 0
> while i < 5:
>     i += 1
>     if i == 7:
>         print('i == 7')
>         break
> else:
>     print('loop is over')
> 
> 
> # else branch wont be executed
> i = 0
> while i < 5:
>     i += 1
>     if i == 3:
>         print('i == 3')
>         break
> else:
>     print('loop is over')

Huh?! I would have expected all your examples to raise a SyntaxError or
IndentationError. Why don't they? Is 'else' not required to have a
matching 'if'?

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#37288

On Wed, Jan 23, 2013 at 2:39 AM, Thomas Boell <tboell@domain.invalid> wrote:
> Huh?! I would have expected all your examples to raise a SyntaxError or
> IndentationError. Why don't they? Is 'else' not required to have a
> matching 'if'?

Other things can have else, including 'for' and 'while' loops. :)

ChrisA

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#37291

On Wed, 23 Jan 2013 02:42:27 +1100
Chris Angelico <rosuav@gmail.com> wrote:

> On Wed, Jan 23, 2013 at 2:39 AM, Thomas Boell <tboell@domain.invalid> wrote:
> > Huh?! I would have expected all your examples to raise a SyntaxError or
> > IndentationError. Why don't they? Is 'else' not required to have a
> > matching 'if'?
> 
> Other things can have else, including 'for' and 'while' loops. :)

I must say, that's bound to be confusing for anyone who knows any
language other than Python (or none, even).  Syntax like that is "an
accident waiting to happen"...

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#37296

On Wed, Jan 23, 2013 at 2:48 AM, Thomas Boell <tboell@domain.invalid> wrote:
> On Wed, 23 Jan 2013 02:42:27 +1100
> Chris Angelico <rosuav@gmail.com> wrote:
>
>> On Wed, Jan 23, 2013 at 2:39 AM, Thomas Boell <tboell@domain.invalid> wrote:
>> > Huh?! I would have expected all your examples to raise a SyntaxError or
>> > IndentationError. Why don't they? Is 'else' not required to have a
>> > matching 'if'?
>>
>> Other things can have else, including 'for' and 'while' loops. :)
>
> I must say, that's bound to be confusing for anyone who knows any
> language other than Python (or none, even).  Syntax like that is "an
> accident waiting to happen"...

It can be confusing and does take that bit of learning, but it's SO
handy. In C code, I sometimes simulate it with a 'goto' and a comment,
but the actual keyword is much clearer.

ChrisA

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#37366

On Tue, 22 Jan 2013 16:48:35 +0100, Thomas Boell wrote:

> On Wed, 23 Jan 2013 02:42:27 +1100
> Chris Angelico <rosuav@gmail.com> wrote:
> 
>> On Wed, Jan 23, 2013 at 2:39 AM, Thomas Boell <tboell@domain.invalid>
>> wrote:
>> > Huh?! I would have expected all your examples to raise a SyntaxError
>> > or IndentationError. Why don't they? Is 'else' not required to have a
>> > matching 'if'?
>> 
>> Other things can have else, including 'for' and 'while' loops. :)
> 
> I must say, that's bound to be confusing for anyone who knows any
> language other than Python (or none, even).  Syntax like that is "an
> accident waiting to happen"...

Oh it's even worse than that. I reckon that nearly everyone thinks that 
for...else runs the "else" clause if the for loop is empty, at least the 
first time they see it. Or for the slow of thinking like me, the first 
few dozen times.

# this is wrong, but it looks right
for x in sequence:
    do_something_with(x)
else:
    print "sequence is empty"


But no, that's not what it does. `for...else` is actually more like this:


# this is right
for x in sequence:
    do_something_with(x)
    if condition:
        break
else:
    print "condition was never true"


That's right. The `else` block *unconditionally* executes after the `for` 
block. The only way to skip it is to use `break`, which skips all the way 
out of the combined for...else statement.

This is a very useful feature, very badly named.



-- 
Steven

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#37385

[Multipart message — attachments visible in raw view] — view raw

it seems that lot of you are forgeting about this case:

for i in [1,2,3,4,5]:
    print i
else:
    print('this will be printed also because cycle wasnt broke')

so the one case when else branch is executed is when condition is not
satisfied and the other case is when there is no break executed during the
cycle

On Wed, Jan 23, 2013 at 12:22 AM, Steven D'Aprano <
steve+comp.lang.python@pearwood.info> wrote:

> On Tue, 22 Jan 2013 16:48:35 +0100, Thomas Boell wrote:
>
> > On Wed, 23 Jan 2013 02:42:27 +1100
> > Chris Angelico <rosuav@gmail.com> wrote:
> >
> >> On Wed, Jan 23, 2013 at 2:39 AM, Thomas Boell <tboell@domain.invalid>
> >> wrote:
> >> > Huh?! I would have expected all your examples to raise a SyntaxError
> >> > or IndentationError. Why don't they? Is 'else' not required to have a
> >> > matching 'if'?
> >>
> >> Other things can have else, including 'for' and 'while' loops. :)
> >
> > I must say, that's bound to be confusing for anyone who knows any
> > language other than Python (or none, even).  Syntax like that is "an
> > accident waiting to happen"...
>
> Oh it's even worse than that. I reckon that nearly everyone thinks that
> for...else runs the "else" clause if the for loop is empty, at least the
> first time they see it. Or for the slow of thinking like me, the first
> few dozen times.
>
> # this is wrong, but it looks right
> for x in sequence:
>     do_something_with(x)
> else:
>     print "sequence is empty"
>
>
> But no, that's not what it does. `for...else` is actually more like this:
>
>
> # this is right
> for x in sequence:
>     do_something_with(x)
>     if condition:
>         break
> else:
>     print "condition was never true"
>
>
> That's right. The `else` block *unconditionally* executes after the `for`
> block. The only way to skip it is to use `break`, which skips all the way
> out of the combined for...else statement.
>
> This is a very useful feature, very badly named.
>
>
>
> --
> Steven
> --
> http://mail.python.org/mailman/listinfo/python-list
>

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#37401

On Wed, 23 Jan 2013 01:34:02 +0100, René Kla?an <rene.klacan@gmail.com>
declaimed the following in gmane.comp.python.general:

> it seems that lot of you are forgeting about this case:
> 
> for i in [1,2,3,4,5]:
>     print i
> else:
>     print('this will be printed also because cycle wasnt broke')
> 
> so the one case when else branch is executed is when condition is not
> satisfied and the other case is when there is no break executed during the
> cycle
>

	The short summary is that the "else:" is performed ANY TIME the loop
exits normally... Only an internal "break" will skip the "else:".
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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#37392

On Jan 23, 1:48 am, Thomas Boell <tbo...@domain.invalid> wrote:
> I must say, that's bound to be confusing for anyone who knows any
> language other than Python (or none, even).  Syntax like that is "an
> accident waiting to happen"...

No, ignorantly expecting every language to conform to every other is
the pending accident.

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