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

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I'd like to add the following to a python-program:

when a module (take rtlsdr as an example) is not installed on the system I'd 
like to ask the program something like:

module rtlsdr is missing, shall I install it? y or n
if n -->sorry but then I can't run this program and quit program
if y -->execute this command:
os.system(sudo pip install pyrtlsdr)

continue program

can anyone here show me how to perform this properly?

thanks in advance
hugo

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[newbie] how to make program suggest to install missing modules "hugocoolens" <hugocoolens@1:249/999.remove-cdt-this> - 2014-12-09 11:32 -0500
  Re: [newbie] how to make program suggest to install missing modules sohcahtoa82@gmail.com.remove-cdt-this - 2014-12-09 11:32 -0500

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