def __len__()

in torchdata/datapipes/iter/util/samplemultiplexer.py [0:0]

• 10 lines of code
• 6 McCabe index (conditional complexity)

    def __len__(self) -> int:
        if self.length is not None:
            if self.length == -1:
                raise TypeError(f"{type(self).__name__} instance doesn't have valid length")
            return self.length
        if all(isinstance(dp, Sized) for dp, _ in self.pipes_and_weights):
            self.length = sum(len(dp) for dp, _ in self.pipes_and_weights)
        else:
            self.length = -1
        return len(self)