在Python中获得与Java相同的左移 [英] Get the same shift left in Python as Java

问题描述

具体地说，我想使用这个号码:

Specifically I want to take this number:

x = 1452610545672622396

并执行

x ^= (x << 21) // In Python I do x ^= (x << 21) & 0xffffffffffffffff

我想获得: -6403331237455490756，这是我在Java中获得的东西

I want to get: -6403331237455490756, which is what I get in Java

代替:12043412836254060860，这是我在Python中获得的(这是我不想要的)

instead of: 12043412836254060860, which is what I get in Python (which is what I don't want)

在Java中，我这样做:

In Java I do:

long x = 1452610545672622396;
x ^= (x << 21);

推荐答案

您可以使用

You can use 64bit signed int like java using ctypes.c_longlong, please see example below:

from ctypes import c_longlong as ll

x = 1452610545672622396

output = ll(x^(x<<21))

print output
print output.__class__

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