'Case-sensitive path existence check
>>> sdist._cs_path_exists(__file__)
True
>>> sdist._cs_path_exists(__file__.upper())
False'

@staticmethod
def _cs_path_exists(fspath):

    if (not os.path.exists(fspath)):
        return False
    abspath = os.path.abspath(fspath)
    (directory, filename) = os.path.split(abspath)
    return (filename in os.listdir(directory))
