Python-apt is a wrapper to use features of apt from python.

It contains the following modules:

C++ Wrapper:
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apt_pkg - access to libapt-pkg (wrapper to the lowlevel c++ code)
apt_inst - access to libapt-inst (wrapper to the lowlevel c++ code)

Python module:
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WARNING: the API of this module is not stable yet

apt - high level python interface build on top of apt_pkg, apt_inst