python中hashlib md5

如下两种方法，结果相同

import hashlib
import time

m = hashlib.md5()
m.update(str(time.time()).encode('utf-8'))
print(m.hexdigest())

m2 = hashlib.md5(str(time.time()).encode('utf-8'))
print(m2.hexdigest())

# ad8720ac04abb38e20d79093b18505c1
# ad8720ac04abb38e20d79093b18505c1

或

import hashlib
import time

m = hashlib.md5()
m.update(str(time.time()).encode('utf-8'))
m.update('lcg'.encode('utf-8'))
print(m.hexdigest())

m2 = hashlib.md5((str(time.time())+'lcg').encode('utf-8'))
print(m2.hexdigest())

# 0f1bd01d97cd41525cd79b27b6e0b5ba
# 0f1bd01d97cd41525cd79b27b6e0b5ba