trace manipulations to os.environ in python

example.py

# to investigate which code is manipulating os.environ
class trace(dict):
    def __delitem__(self, k):
        self._trace(k)
        super().__delitem__(k)

    def _trace(self, k):
        import inspect
        curframe = inspect.currentframe()
        calframe = inspect.getouterframes(curframe, 2)
        caller = calframe[2][3]
        caller = getattr(caller, '__name__', caller)
        print(f'{caller} deleted {k}')

    def pop(self, k=None, d=None):
        self._trace(k)
        return super().pop(k, d)

import os
os.environ = trace(os.environ)