Method replace

Lib/collections/__init__.py:1596–1601

(self, old, new, maxsplit=-1)

        return self.data.partition(sep)

    def replace(self, old, new, maxsplit=-1):
        if isinstance(old, UserString):
            old = old.data
        if isinstance(new, UserString):
            new = new.data
        return self.__class__(self.data.replace(old, new, maxsplit))

    def rfind(self, sub, start=0, end=_sys.maxsize):
        if isinstance(sub, UserString):