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python on Linux

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  python on Linux Igor Korot <ikorot01@gmail.com> - 2014-10-09 21:21 -0700
    Re: python on Linux John Gordon <gordon@panix.com> - 2014-10-10 04:37 +0000
    Re: python on Linux Irmen de Jong <irmen.NOSPAM@xs4all.nl> - 2014-10-10 08:31 +0200
      Re: python on Linux Chris Angelico <rosuav@gmail.com> - 2014-10-10 17:58 +1100
        Re: python on Linux Irmen de Jong <irmen.NOSPAM@xs4all.nl> - 2014-10-10 09:48 +0200
      Re: python on Linux Peter Pearson <pkpearson@nowhere.invalid> - 2014-10-10 15:44 +0000
        Re: python on Linux Chris Angelico <rosuav@gmail.com> - 2014-10-11 02:53 +1100
      Re: python on Linux Ian Kelly <ian.g.kelly@gmail.com> - 2014-10-10 09:52 -0600

#78920 — python on Linux

Hi, ALL,
When I am on Windows, I can write something like this:

sys.path.append('C:\Users\Igor\Documents\MyLib')

Now, when I'm on Linux, can I do this:

sys.path.append('~/MyLib')

?

I.e., will '~' sign be expanded correctly?

Thank you.

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#78921

In <mailman.14733.1412914913.18130.python-list@python.org> Igor Korot <ikorot01@gmail.com> writes:

> sys.path.append('~/MyLib')

> I.e., will '~' sign be expanded correctly?

Not as written.

Use os.path.expanduser() to get user's home directories.

-- 
John Gordon         Imagine what it must be like for a real medical doctor to
gordon@panix.com    watch 'House', or a real serial killer to watch 'Dexter'.

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#78925

On 10-10-2014 6:21, Igor Korot wrote:
> Hi, ALL,
> When I am on Windows, I can write something like this:
> 
> sys.path.append('C:\Users\Igor\Documents\MyLib')

While this might work on your system, it may not work on others.

- you need to escape the backslashes (or just use forward slashes, they work on windows too)
- not all windows installations and versions have their user folders in
C:\Users\<username>. On windows too, you'll have to use something like %USERPROFILE% to
get to the correct directory if you want it to work correctly in all cases.


Irmen

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#78928

On Fri, Oct 10, 2014 at 5:31 PM, Irmen de Jong <irmen.NOSPAM@xs4all.nl> wrote:
> On 10-10-2014 6:21, Igor Korot wrote:
>> Hi, ALL,
>> When I am on Windows, I can write something like this:
>>
>> sys.path.append('C:\Users\Igor\Documents\MyLib')
>
> While this might work on your system, it may not work on others.
>
> - you need to escape the backslashes (or just use forward slashes, they work on windows too)
> - not all windows installations and versions have their user folders in
> C:\Users\<username>. On windows too, you'll have to use something like %USERPROFILE% to
> get to the correct directory if you want it to work correctly in all cases.

AIUI you can use os.path.expanduser() on Windows as well, and it'll
take care of USERPROFILE.

ChrisA

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#78933

On 10-10-2014 8:58, Chris Angelico wrote:

> AIUI you can use os.path.expanduser() on Windows as well, and it'll
> take care of USERPROFILE.

Nice, didn't know that!
I've been using the appdirs module (https://pypi.python.org/pypi/appdirs/) as well to
avoid constructing paths manually altogether.

Irmen

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#78955

On Fri, 10 Oct 2014 08:31:04 +0200, Irmen de Jong wrote:
> On 10-10-2014 6:21, Igor Korot wrote:

>> When I am on Windows, I can write something like this:
>> 
>> sys.path.append('C:\Users\Igor\Documents\MyLib')
>
> While this might work on your system, it may not work on others.
>
> - you need to escape the backslashes (or just use forward slashes,
> they work on windows too)

And remember that os.path.join() will join path fragments with
the right kind of slashes for your operating system.

-- 
To email me, substitute nowhere->runbox, invalid->com.

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#78957

On Sat, Oct 11, 2014 at 2:44 AM, Peter Pearson
<pkpearson@nowhere.invalid> wrote:
> On Fri, 10 Oct 2014 08:31:04 +0200, Irmen de Jong wrote:
>> On 10-10-2014 6:21, Igor Korot wrote:
>
>>> When I am on Windows, I can write something like this:
>>>
>>> sys.path.append('C:\Users\Igor\Documents\MyLib')
>>
>> While this might work on your system, it may not work on others.
>>
>> - you need to escape the backslashes (or just use forward slashes,
>> they work on windows too)
>
> And remember that os.path.join() will join path fragments with
> the right kind of slashes for your operating system.

That's fine if you have the parts separately already, but when it's
primarily a single literal string, just use slashes and save yourself
the trouble.

ChrisA

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#78956

On Fri, Oct 10, 2014 at 12:31 AM, Irmen de Jong <irmen.NOSPAM@xs4all.nl> wrote:
> - you need to escape the backslashes (or just use forward slashes, they work on windows too)

Or use a raw string. There is usually no reason to have escape
sequences at all in a file system path.

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