Class CustomOpenHook

Lib/test/test_fileinput.py:269–274

            pass

        class CustomOpenHook:
            def __init__(self):
                self.invoked = False
            def __call__(self, *args, **kargs):
                self.invoked = True
                return open(*args, encoding="utf-8")

        t = self.writeTmp("\n")
        custom_open_hook = CustomOpenHook()