[newbie] how to make program suggest to install missing modules

[Chris Warrick]

On Dec 12, 2014 11:56 AM, "hugocoolens" <hugocoolens at gmail.com> wrote:
>
> On Monday, December 8, 2014 9:00:13 PM UTC+1, sohca... at gmail.com wrote:
> > On Monday, December 8, 2014 10:46:47 AM UTC-8, Jean-Michel Pichavant
wrote:
> > > ----- Original Message -----
> > > > From: sohcahtoa82 at gmail.com
> > > > try:
> > > >     import someModule
> > > > except ImportError:
> > > >     print "Module is missing"
> > > >     # handle it!
> > > >
> > > > Just make sure to attempt to import it again after making the call
to
> > > > pip to install it.
> > >
> > > Note that ImportError may be raised for other reasons than a missing
module.
> > >
> > > Check https://docs.python.org/2/library/imp.html and the
imp.find_module, it could be a safer way to check for a missing module.
> > >
> > > JM
> > >
> > >
> > > -- IMPORTANT NOTICE:
> > >
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> > Good point.
> > Of course, imp.find_module ALSO throws ImportError if the module can't
be found, but at least in that case, you'd know the exact cause.
>
> Thanks for the suggestions, you can see here below what I came up with.
> All suggestions/corrections welcome:
>
> #!/usr/bin/env python
> import imp
> import os
> import sys
> try:
>     imp.find_module('rtlsdr')
> except ImportError:
>     print('Module rtlsdr is missing')
>     print("I'll try to install it")
>     os.system('sudo pip install pyrtlsdr')
>     try:
>         imp.find_module('rtlsdr')
>     except ImportError:
>         sys.exit('Sorry could not install module rtlsdr, contact your
> local Python-guru')
> import rtlsdr
> print('Module rtlsdr succesfully imported')
>
>
>
> --
> https://mail.python.org/mailman/listinfo/python-list

This is bad practice. The user should install it themselves: sudo pip may
interfere with virtualenv and OS package managers. Just tell the user what
to install and call it a day.

-- 
Chris Warrick <https://chriswarrick.com/>
Sent from my Galaxy S3.
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