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time-machine is intended to combine the advantages of freezegun and libfaketime
Python modules. It works without LD_PRELOAD but still mocks the standard
library functions everywhere they may be referenced. It does so by modifying
the built-in functions at the C level, to point them through wrappers that
return different values when mocking. Normally in Python, built-in functions
are immutable, but time-machine overcomes this by using C code to replace their
function pointers.