什么是monkey patch（猴子补丁）

import socket

print(socket.socket)


print("After monkey patch")
from gevent import monkey
monkey.patch_socket()
print(socket.socket())

import select
print(select.select)
monkey.patch_select()
print("After monkey patch")
print(select.select)


import time
print(time.time())

def _time():
    return 1234

time.time = _time
print(time.time())    # 这样就实现了运行替换，所谓的monkey patch