human
Complete the below
def libxml2debug(testfunction):

    ''''Decorator for debugging libxml2 memory leaks inside a function.
    We\'ve found libxml2 memory leaks are something very weird, and can happen
    sometimes depending on the order where tests are run. So this decorator
    enables libxml2 memory leaks debugging only when the environment variable
    LIBXML2_DEBUGLEAKS is set.'
    '''

=====
Write me a the Python code you requested?
assistant
#Here is the Python code you requested.
    try:
        import libxml2
    except ImportError:
        return testfunction
    def newfunc(*args, **kwargs):
        libxml2.debugMemory(1)
        testfunction(*args, **kwargs)
        libxml2.cleanupParser()
        leaked_bytes = libxml2.debugMemory(0)
        assert (leaked_bytes == 0), ('libxml2    memory    leak    detected:    %d    bytes' % leaked_bytes)
    if ('LIBXML2_DEBUGLEAKS' in os.environ):
        return newfunc
    else:
        return testfunction