sys.setrecursionlimit(1<<64)
Line 3: OverflowError: Python int too large to convert to C long
max: 2**64-1, (1<<64) - 1
sys.setrecursionlimit(1<<31)
Line 3: OverflowError: signed integer is greater than maximum
signed integer should be -1<<31 ~ (1<<31) - 1, -2**32 ~ 2**32
原文：http://www.cnblogs.com/huashiyiqike/p/4590528.html