[Python-ideas] install pip packages from Python prompt

[Stephan Houben]

Hi Antoine,

2017-10-29 20:31 GMT+01:00 Antoine Rozo <antoine.rozo at gmail.com>:

> Hi,
>
> What would be the difference with current pip module?
> pip.main(['install', 'some_package'])
>


My understanding is that direct use of the `pip` module is explicitly not
recommended.

Stephan




>
> 2017-10-29 20:26 GMT+01:00 Alex Walters <tritium-list at sdamon.com>:
>
>> I have a somewhat better, imo, implementation of a pip object to be
>> loaded into the repl.
>>
>>
>>
>> class pip:
>>
>>     def __call__(self, *a, **kw):
>>
>>         sys.stderr.write(str(self))
>>
>>
>>
>>     def __repr__(self):
>>
>>         return str(self)
>>
>>
>>
>>     def __str__(self):
>>
>>         return “Please run pip from your system command prompt”
>>
>>
>>
>>
>>
>>
>>
>> *From:* Python-ideas [mailto:python-ideas-bounces+tritium-list=
>> sdamon.com at python.org] *On Behalf Of *Stephan Houben
>> *Sent:* Sunday, October 29, 2017 3:19 PM
>> *To:* Python-Ideas <python-ideas at python.org>
>> *Subject:* [Python-ideas] install pip packages from Python prompt
>>
>>
>>
>> Hi all,
>>
>> Here is in somewhat more detail my earlier proposal for
>>
>> having in the interactive Python interpreter a `pip` function to
>>
>> install packages from Pypi.
>>
>> Motivation: it appears to me that there is a category of newbies
>>
>> for which "open a shell and do `pip whatever`" is a bit too much.
>>
>> It would, in my opinion, simplify things a bit if they could just
>>
>> copy-and-paste some text into the Python interpreter and have
>>
>> some packages from pip installed.
>>
>> That would simplify instructions on how to install package xyz,
>>
>> without going into the vagaries of how to open a shell on various
>>
>> platforms, and how to get to the right pip executable.
>>
>> I think this could be as simple as:
>>
>>   def pip(args):
>>       import sys
>>       import subprocess
>>       subprocess.check_call([sys.executable, "-m", "pip"] + args.split())
>>
>>       print("Please re-start Python now to use installed or upgraded
>> packages.")
>>
>> Note that I added the final message about restarting the interpreter
>>
>> as a low-tech solution to the problem of packages being already
>>
>> imported in the current Python session.
>>
>> I would imagine that the author of package xyz would then put on
>>
>> their webpage something like:
>>
>>   To use, enter in your Python interpreter:
>>
>>      pip("install xyz --user")
>>
>> As another example, consider prof. Baldwin from Woolamaloo university
>>
>> who teaches a course "Introductory Python programming for Sheep Shavers".
>>
>> In his course material, he instructs his students to execute the
>>
>> following line in their Python interpreter.
>>
>>    pip("install woolamaloo-sheepshavers-goodies --user")
>>
>> which will install a package which will in turn, as dependencies,
>>
>> pull in a number of packages which are relevant for sheep shaving but
>>
>> which have nevertheless irresponsibly been left outside the stdlib.
>>
>> Stephan
>>
>>
>>
>>
>>
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>>
>>
>
>
> --
> Antoine Rozo
>
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>
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