How to know the system is Debian or CentOS in Python?

I want to write some install scripts by python, it should know the OS to choose either apt command or yum command.

It seems sys.开发者_运维技巧platform can tell 'win32' or the others, but how to know it is working on Debian or CentOS in Python?

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The platform module in the standard library has what you want.

import platform
print platform.linux_distribution()

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If you just need to know whether to use yum or apt, one approach is simply to pick one of those commands and try it. If it works, it works; if not, catch the exception and try the other command.