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import pydoop.hdfs as hdfs


def kv_pair(s):
    return s.split("=", 1)


def a_file_that_can_be_read(x):
    with open(x, 'r'):
        pass
    return x


def a_hdfs_file(x):
    _, _, _ = hdfs.path.split(x)
    return x


def a_comma_separated_list(x):
    # FIXME unclear how does one check for bad lists...
    return x
