Function evaluate_slice_index

Lib/test/test_slice.py:14–25

Helper function to convert a slice argument to an integer, and raise TypeError with a suitable message on failure.

(arg)

def evaluate_slice_index(arg):
    """
    Helper function to convert a slice argument to an integer, and raise
    TypeError with a suitable message on failure.

    """
    if hasattr(arg, '__index__'):
        return operator.index(arg)
    else:
        raise TypeError(
            "slice indices must be integers or "
            "None or have an __index__ method")

def slice_indices(slice, length):
    """