Python中关于函数的具体用法范例以及介绍

def 函数名():
    执行语句
函数名()    #调用函数

def info():
    print("人生苦短我用python")
info()

def test1(a,b):   # a,b为参数
    c=a+b
    print(c)
test1(1,2)  # 调用带有参数的函数时，需要在小括号中，传递数据

def 函数名(参数1,参数2):
    代码块
函数名(值1,值2)

def fun(a,b):
    print("a:",a)
    print("b:",b)
fun(2,3)

def 函数名(参数1,参数2):
    代码块
函数名(参数1=值1,参数2=值2)

def fun(a,b):
    print("a:",a)
    print("b:",b)
fun(a=2,b=3)

def fun(a,b):
    print("a:",a)
    print("b:",b)
fun(3,b=2)

def fun(a,b):
    print("a:",a)
    print("b:",b)
fun(a=3,2)

def printinfo(name,age=20):
    print("name:",name)
    print("age:",age)
printinfo(name="jack")

def printinfo(*args,**kwargs):
    print("args:",args)
    print("kwargs:",kwargs)
printinfo(参数)

def printinfo(*args):
    print("args:",args)
printinfo(100,200,300,400)

def printinfo(**kwargs):
    print("kwargs:",kwargs)
printinfo(a=100,b=200,c=300,d= 400)

def fun(位置参数,*args,缺省参数,**kwargs):
    代码块
fun(参数值)

def sun(a,*args,b=22,**kwargs):
    print("a：",a)
    print("args：",args)
    print("b：",b)
    print("kwargs：",kwargs)
sun(100,200,300,b=2,m=3,n=4)

def sum():
    代码块
    return 值
sum()

def sum(a,b):
    return a+b
result = sum(1,2)   #保存函数的返回值
print(result)

def create_nums(num):
    print("---1---")
    if num == 100:
        print("---2---")
        return num + 1  # 函数中下面的代码不会被执行，因为return除了能够将数据返回之外，还有一个隐藏的功能：结束函数
        print("return执行之后不会继续执行")
    else:
        print("wewe")
        return "输入不是100"
print(create_nums(100))

def divid(a, b):
    add = a+b    #相加
    reduct = a-b    #相减
    return add, reduct  #默认是元组
result = divid(5, 2)
print(result)

def printMenu():
    print('--------------------------')
    print('      xx涮涮锅 点菜系统')
    print('')
    print('  1.  羊肉涮涮锅')
    print('  2.  牛肉涮涮锅')
    print('  3.  猪肉涮涮锅')
    print('--------------------------')

def getTemperature():
    # 这里是获取温度的一些处理过程
    # 为了简单起见，先模拟返回一个数据
    return 24
tem=getTemperature()
print(tem)

# 计算1~num的累积和
def calculateNum(num):
    result = 0
    i = 1
    while i<=num:
        result = result + i
        i+=1
    return result
cal=calculateNum(100)
print(cal)

def testb():
    print("testb start")
    print("testb testb  执行")
    print("testb end")
def testa():
    print("testa start")
    testb()
    print("testa end")
testa()

g = lambda x :x+1
print(g(1))

def g(x):
    return x + 1
print(g(1))

def func(a,b,c):
    return a+b+c
print(func(1,4,7))

def func1(a,b,c):
    return (a+b+c)/3
print(func1(2,3,4))

def func2(a,b,c):
    d=(a+b+c)/3
    return a-d,b-d,c-d
print(func2(5,8,2))