def remove_leading(needle, haystack):
if haystack[:len(needle)] == needle:<EOL><INDENT>return haystack[len(needle):]<EOL><DEDENT>return haystack<EOL>
Remove leading needle string (if exists).

    >>> remove_leading('Test', 'TestThisAndThat')
    'ThisAndThat'
    >>> remove_leading('Test', 'ArbitraryName')
    'ArbitraryName'