Python：datetime模块总结

1. 介绍

datetime库中定义的几个类：

具体详细方法和总结，参考这篇文章《datetime 时间和日期模块》 

2.格式化输出字符串

可以按照需要格式化输出字符串：datetime.datetime.strftime("format")

代码例子：

import datetime
t = datetime.datetime.now()
print(t.strftime("%Y%m%d"),type(t.strftime("%Y%m%d")))
print(t.strftime("%Y-%m_%d:%H-%M:%S"))
 
# 输出
# 20220909 
# 2022-09_09:10-41:33

 3. 常用代码

 1）计算时间差：

import datetime
# 2022-04-24 10:51:23.677632
start_time = datetime.datetime(2022, 4, 24, 10, 51, 23, 677632)
# 2022-04-25 11:52:35.713161
end_time = datetime.datetime(2022, 4, 24, 10, 51, 24, 687638)
delta = end_time-start_time
# 获取timedelta对象经过单位换算后的总秒数
print("seconds: ", delta.seconds)
# 获取timedelta对象经过单位换算后的总微秒数
print("microseconds: ", delta.microseconds)
# 获取timedelta对象包含的总秒数
print("total_seconds: ", delta.total_seconds())
# 四舍五入，保留2位小数
print("total_seconds: ", round(delta.total_seconds(),2))
 
# 输出
# seconds:  1
# seconds:  10006
# total_seconds:  1.010006
# total_seconds:  1.01

测试计时例子：

import datetime
import time
start_time = datetime.datetime.now()
print("start_time:",start_time)
# 强制等待10秒时间,import time
time.sleep(10) 
end_time = datetime.datetime.now()
print("end_time:",end_time)
delta = end_time-start_time
# 获取timedelta对象经过单位换算后的总秒数
print("seconds: ", delta.seconds)
# 获取timedelta对象经过单位换算后的总微秒数
print("microseconds: ", delta.microseconds)
# 获取timedelta对象包含的总秒数
print("total_seconds: ", delta.total_seconds())
# 四舍五入，保留2位小数
print("total_seconds: ", round(delta.total_seconds(),2))
 
# 输出
start_time: 2022-09-09 10:54:49.917227
end_time: 2022-09-09 10:54:59.917423
seconds:  10
microseconds:  196
total_seconds:  10.000196
total_seconds:  10.0