Redundant features in python library, PyQt

[jladasky at itu.edu]

Python's standard library has (to take three examples) threads, processes, and  datetime functions.  Meanwhile, PyQt has QThread, QProcess, and QDateTime.

Does this redundancy exist for C++ programmers who are programming Qt directly, and who may lack a standard C++ library with these features?  Are the Python wrappers simply provided for completeness, or do these libraries truly function differently?  When writing a PyQt application, how does one choose between the standard library and the PyQt library?