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The so-called function refers to: the code of certain specific functions is composed into a whole, and this whole is called a function.
What is the definition of a function : It’s equivalent to defining a function that can complete certain events; it’s like building a tool yourself.
Define function format:
def test(): print('----嘻嘻----') print('----这是我的第一个函数----')
What is a function call: If you just define a function, it actually cannot It is automatically executed and must be called.
# In layman's terms: defining a function is equivalent to creating a tool, and calling a function is equivalent to using this tool to accomplish what you want to do.
# 定义一个函数 def test(): print('----嘻嘻----') print('----这是我的第一个函数----') # 调用函数 test()
Running result:
开发中,经常需要打印一些调试的信息,此时就又必须要输出时间,这就需要一些时间函数。
1. 获取当前日期:time.time()
import time # 引入time模块 currentTime = time.time() print("当前时间戳为:", currentTime)
运行结果 :
2. 获取元组形式的时间戳:time.local(time.time())
import time localtime = time.localtime(time.time()) print ( "本地时间为 :", localtime)
运行结果 :
import time localtime = time.asctime( time.localtime(time.time()) ) print ( "本地时间为 :", localtime)
运行结果 :
1. 日期输出格式化 datetime => string
import datetime now = datetime.datetime.now() now.strftime('%Y-%m-%d %H:%M:%S')
2. 日期输出格式化 string => datetime
import datetime t_str = '2019-04-07 16:11:21' d = datetime.datetime.strptime(t_str, '%Y-%m-%d %H:%M:%S') print(d)
运行结果:
strptime是datetime类的静态方法。
3. 日期比较操作
在datetime模块中有timedelta类,这个类的对象用于表示一个时间间隔,比如两个日期或者时间的差别。
构造方法:
import datetime datetime.timedelta(days=0, seconds=0, microseconds=0, milliseconds=0, minutes=0, hours=0, weeks=0)
所有的参数都有默认值0,这些参数可以是int或float,正的或负的。
可以通过 timedelta.days、tiemdelta.seconds 等获取相应的时间值。
timedelta 类的实例,支持加、减、乘、除等操作,所得的结果也是 timedelta 类的实例。
import datetime year = datetime.timedelta(days=365) t_years = year *10 new_years = ten_years - year print(t_years) print(new_years)
运行结果:
date、time和datetime类也支持与timedelta的加、减运算。
datetime1 = datetime2 + timedelta timedelta = datetime1 - datetime2
这样,可以很方便的实现一些功能。
import calendar dar = calendar.month(2016, 8) print ( "2016年8月份的日历:") print (dar)
运行结果:
import random a = random.uniform(1, 5) print("a =", a) b = random.randint(10, 50) print ("b =", b) c = random.randrange(0, 51, 2) print ("c =", c)
运行结果:
本文详细的讲解了Python基础之函数的定义,调用 。介绍了常用的三种函数的使用方法。通过一个个的小项目使读者更好的认识和运用函数,希望可以帮助你更好的学习Python。
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