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From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Newsgroups: comp.lang.python
Subject: Re: How to make Python interpreter a little more strict?
Date: Sat, 26 Mar 2016 14:02:48 -0400
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Xref: csiph.com comp.lang.python:105782

On Fri, 25 Mar 2016 15:06:08 +0300, Aleksander Alekseev <afiskon@devzen.ru>
declaimed the following:

>Hello
>
>Recently I spend half an hour looking for a bug in code like this:
>
>eax@fujitsu:~/temp$ cat ./t.py 
>#!/usr/bin/env python3
>
>for x in range(0,5):
>    if x % 2 == 0:
>        next
>    print(str(x))
>
>eax@fujitsu:~/temp$ ./t.py 
>0
>1
>2
>3
>4
>
>Is it possible to make python complain in this case? Or maybe solve
>such an issue somehow else?

	By trying it out in the interactive window? (Note: Python 2.7 -- though
Python 3 doesn't need the "str(x)" either -- print will still ask for the
printable form of x.

>>> for x in range(0,5):
... 	if (x % 2) == 0:
... 		next
... 	print x
... 	
<built-in function next>
0
1
<built-in function next>
2
3
<built-in function next>
4
>>> 

>>> for x in range(0,5):
... 	if (x % 2) == 0:
... 		next()
... 	print x
... 
Traceback (most recent call last):
  File "<interactive input>", line 3, in <module>
TypeError: next expected at least 1 arguments, got 0
>>> 

>>> for x in range(0,5):
... 	if (x % 2) == 0:
... 		continue
... 	print x
... 
1
3
>>> 
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/