如何将字符串转换为datetime

#!/usr/bin/env python

# -*- coding:utf-8 -*-

import datetime

import time

# 日期时间字符串

st = "2017-11-23 16:10:10"

# 当前日期时间

dt = datetime.datetime.now()

# 当前时间戳

sp = time.time()

# 1.把datetime转成字符串

def datetime_toString(dt):

    print("1.把datetime转成字符串: ", dt.strftime("%Y-%m-%d %H:%M:%S"))

# 2.把字符串转成datetime

def string_toDatetime(st):

    print("2.把字符串转成datetime: ", datetime.datetime.strptime(st, "%Y-%m-%d %H:%M:%S"))

# 3.把字符串转成时间戳形式

def string_toTimestamp(st):

    print("3.把字符串转成时间戳形式:", time.mktime(time.strptime(st, "%Y-%m-%d %H:%M:%S")))

# 4.把时间戳转成字符串形式

def timestamp_toString(sp):

    print("4.把时间戳转成字符串形式: ", time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(sp)))

# 5.把datetime类型转外时间戳形式

def datetime_toTimestamp(dt):

    print("5.把datetime类型转外时间戳形式:", time.mktime(dt.timetuple()))

# 1.把datetime转成字符串

datetime_toString(dt)

# 2.把字符串转成datetime

string_toDatetime(st)

# 3.把字符串转成时间戳形式

string_toTimestamp(st)

# 4.把时间戳转成字符串形式

timestamp_toString(sp)

# 5.把datetime类型转外时间戳形式

datetime_toTimestamp(dt)