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python package confusion

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  python package confusion Lipska the Kat <lipska@lipskathekat.com> - 2012-07-23 11:02 +0100
    Re: python package confusion Dave Angel <d@davea.name> - 2012-07-23 06:19 -0400
      Re: python package confusion Lipska the Kat <lipska@lipskathekat.com> - 2012-07-23 11:54 +0100
    Re: python package confusion Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-07-23 06:22 -0400
      Re: python package confusion Lipska the Kat <lipska@lipskathekat.com> - 2012-07-23 12:02 +0100
        Re: python package confusion David <bouncingcats@gmail.com> - 2012-07-23 21:16 +1000
          Re: python package confusion Lipska the Kat <lipska@lipskathekat.com> - 2012-07-23 12:43 +0100
      Re: python package confusion Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-24 05:38 +0000
        Re: python package confusion Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-07-24 03:49 -0400

#25844 — python package confusion

Hello again pythoners

I'm trying to understand the python package stuff

I have the following directory

/home/lipska/python/dev/mods

In this directory I have two files, both executable

----------------------

#! /usr/bin/env python3.2

# fibo.py Fibonacci numbers module

def fib(n):    # write Fibonacci series up to n
     a, b = 0, 1
     while b < n:
         print(b, end=' ')
         a, b = b, a+b
     print()

----------------------

#! /usr/bin/env python3.2

# test.py fibo module test program

import fibo

fibo.fib(1000)

-----------------------

The PYTHONPATH ev is set to /home/lipska/python/dev/mods:.
in .bashrc

The following interactive session works thusly

lipska@ubuntu:~/python/dev/mods$ python3.2
Python 3.2.3 (default, Jul 17 2012, 14:23:10)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import fibo
 >>> fibo.fib(1000)
1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987
 >>>

However if I try and run test.py as an executable I get the following error

lipska@ubuntu:~/python/dev/mods$ test.py
Traceback (most recent call last):
   File "./test.py", line 5, in <module>
     fib(1000)
NameError: name 'fib' is not defined

if I print sys.path I get the following

 >>> print(sys.path)
['', '/usr/local/lib/python32.zip', '/usr/local/lib/python3.2', 
'/usr/local/lib/python3.2/plat-linux2', 
'/usr/local/lib/python3.2/lib-dynload', 
'/home/lipska/.local/lib/python3.2/site-packages', 
'/usr/local/lib/python3.2/site-packages']

The documentation states that ...

sys.path is initialized from these locations:

     the directory containing the input script (or the current directory).
     PYTHONPATH (a list of directory names, with the same syntax as the 
shell variable PATH).

But apparently the additional locations I specify in .bashrc are not 
being added to sys.path

I also have an empty file __init__.py in the mods directory

Not sure what I'm doing wrong here

Any help much appreciated.

Lipska


-- 
Lipska the Kat: Troll hunter, Sandbox destroyer
and Farscape dreamer of Aeryn Sun.

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#25845

On 07/23/2012 06:02 AM, Lipska the Kat wrote:
> Hello again pythoners
>
> I'm trying to understand the python package stuff
>
> I have the following directory
>
> /home/lipska/python/dev/mods
>
> In this directory I have two files, both executable
>
> ----------------------
>
> #! /usr/bin/env python3.2
>
> # fibo.py Fibonacci numbers module
>
> def fib(n):    # write Fibonacci series up to n
>     a, b = 0, 1
>     while b < n:
>         print(b, end=' ')
>         a, b = b, a+b
>     print()
>
> ----------------------
>
> #! /usr/bin/env python3.2
>
> # test.py fibo module test program
>
> import fibo
>
> fibo.fib(1000)
>
> -----------------------
>
> The PYTHONPATH ev is set to /home/lipska/python/dev/mods:.
> in .bashrc
>
> The following interactive session works thusly
>
> lipska@ubuntu:~/python/dev/mods$ python3.2
> Python 3.2.3 (default, Jul 17 2012, 14:23:10)
> [GCC 4.6.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import fibo
> >>> fibo.fib(1000)
> 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987
> >>>
>
> However if I try and run test.py as an executable I get the following
> error
>
> lipska@ubuntu:~/python/dev/mods$ test.py
> Traceback (most recent call last):
>   File "./test.py", line 5, in <module>
>     fib(1000)
> NameError: name 'fib' is not defined
>

That line isn't the way you showed it in the source.  You showed us
source as  fibo.fib(1000), and the error message shows it as fib(1000)

So you're either cutting & pasting wrong, or you have two test.py files.

-- 

DaveA

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#25847

On 23/07/12 11:19, Dave Angel wrote:
> On 07/23/2012 06:02 AM, Lipska the Kat wrote:
>> Hello again pythoners

snip

> That line isn't the way you showed it in the source.  You showed us
> source as  fibo.fib(1000), and the error message shows it as fib(1000)
>
> So you're either cutting&  pasting wrong, or you have two test.py files.

jeez, you are right. I must be getting old. <embarrased>

Apologies for wasting your time.

Lipska

-- 
Lipska the Kat: Troll hunter, Sandbox destroyer
and Farscape dreamer of Aeryn Sun.

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#25846

On Mon, Jul 23, 2012 at 6:02 AM, Lipska the Kat <lipska@lipskathekat.com> wrote:
> The PYTHONPATH ev is set to /home/lipska/python/dev/mods:.
> in .bashrc

Did you export it? Show us your .bashrc, or the relevant line in it
exactly. (And make sure that it isn't defined multiple times).

Also adding . to the import search path is probably a bad diea.

> lipska@ubuntu:~/python/dev/mods$ test.py
> Traceback (most recent call last):
>   File "./test.py", line 5, in <module>
>     fib(1000)
> NameError: name 'fib' is not defined

Neither of the files you described in your email message contain the
line "fib(1000)", so you pasted the wrong files.

> I also have an empty file __init__.py in the mods directory

This only matters if you want to "import mods".

-- Devin

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#25848

On 23/07/12 11:22, Devin Jeanpierre wrote:
> On Mon, Jul 23, 2012 at 6:02 AM, Lipska the Kat<lipska@lipskathekat.com>  wrote:
>> The PYTHONPATH ev is set to /home/lipska/python/dev/mods:.
>> in .bashrc
>
> Did you export it? Show us your .bashrc, or the relevant line in it
> exactly. (And make sure that it isn't defined multiple times).

forgot to export it <stupid> <stupid> <stupid>

> Also adding . to the import search path is probably a bad diea.

I removed it

>> lipska@ubuntu:~/python/dev/mods$ test.py
>> Traceback (most recent call last):
>>    File "./test.py", line 5, in<module>
>>      fib(1000)
>> NameError: name 'fib' is not defined
> Neither of the files you described in your email message contain the
> line "fib(1000)", so you pasted the wrong files.

See grovelling apology in other reply

>
>> I also have an empty file __init__.py in the mods directory
>
> This only matters if you want to "import mods".

huh .. OK, I'll read again

Thanks for taking the time to reply
It all works now

Lipska <slinks away to hide>

-- 
Lipska the Kat: Troll hunter, Sandbox destroyer
and Farscape dreamer of Aeryn Sun.

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#25849

On 23/07/2012, Lipska the Kat <lipska@lipskathekat.com> wrote:

> Hello again pythoners
 [snip]
 > Any help much appreciated.

Hi Lipska

Glad you got it sorted.

In case you are not aware of this:
  Tutor maillist  -  Tutor@python.org
  http://mail.python.org/mailman/listinfo/tutor

The tutor list caters specifically for requests for basic assistance
such as you made in this thread, and code review such as in your
thread prior. It too is a busy list, and many of the people who have
responded to your previous threads here are also present there, so
you'll get the same high quality answers there too.

By the way, I had a followup to my previous message to you re git, and
emailed it to you directly because it would be off-topic here, but the
email bounced. It seems that you are displaying an invalid email
address, at least here I get:
$ ping lipskathekat.com
ping: unknown host lipskathekat.com
So if you are interested in that, feel free to email me directly, or
not as you wish.

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#25853

On 23/07/12 12:16, David wrote:
> On 23/07/2012, Lipska the Kat<lipska@lipskathekat.com>  wrote:
>
>> Hello again pythoners
>   [snip]
>   >  Any help much appreciated.
>
> Hi Lipska
>
> Glad you got it sorted.
>
> In case you are not aware of this:
>    Tutor maillist  -  Tutor@python.org
>    http://mail.python.org/mailman/listinfo/tutor

I'll certainly look into it, thanks. It was more a problem of trying to 
do too many things at once and doing none of them well. Pathetic excuse 
I know but it's the best I've got. :-(

> So if you are interested in that, feel free to email me directly, or
> not as you wish.

I've sent you  message

Lipska

-- 
Lipska the Kat: Troll hunter, Sandbox destroyer
and Farscape dreamer of Aeryn Sun.

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#25953

On Mon, 23 Jul 2012 06:22:45 -0400, Devin Jeanpierre wrote:

> Also adding . to the import search path is probably a bad diea.


I don't know about a bad idea or not, but it is certainly redundant, 
because Python automatically adds '' (equivalent to '.') to the very 
start of the search path.


-- 
Steven

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#25960

On Tue, Jul 24, 2012 at 1:38 AM, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> I don't know about a bad idea or not, but it is certainly redundant,
> because Python automatically adds '' (equivalent to '.') to the very
> start of the search path.

No, it only does that if Python is reading commands from stdin, or if
Python was run with the -c option, or maybe some other situations. It
doesn't do it if you just run a program, as in "python myfile.py".

-- Devin

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