test_isinstance.py 文件源码

def blowstack(fxn, arg, compare_to):
    # Make sure that calling isinstance with a deeply nested tuple for its
    # argument will raise RuntimeError eventually.
    tuple_arg = (compare_to,)


    if test_support.check_impl_detail(cpython=True):
        RECURSION_LIMIT = sys.getrecursionlimit()
    else:
        # on non-CPython implementations, the maximum
        # actual recursion limit might be higher, but
        # probably not higher than 99999
        #
        RECURSION_LIMIT = 99999

    for cnt in xrange(RECURSION_LIMIT+5):
        tuple_arg = (tuple_arg,)
        fxn(arg, tuple_arg)