winreg.PyHKEY.__enter__()

PyHKEY.__enter__() PyHKEY.__exit__(*exc_info)

The HKEY object implements __enter__() and __exit__() and thus supports the context protocol for the with statement:

with OpenKey(HKEY_LOCAL_MACHINE, "foo") as key:
    ...  # work with key

will automatically close key when control leaves the with block.