Python学习-函数基本操作-优快云博客

def function(): #定义一个函数
a = 1
b = 2
c = a + b
print (“a =”, a)
print (“b =”, b)
print (“c =”, c)
print (“a+b=”, c)
function()
‘’’
结果为：
a = 1
b = 2
c = 3
a+b= 3
‘’’

def function2(a,b): #定义带有参数的函数，参数a、b只在函数内部发生作用
c = a+b
print(“a =”, a)
print(“b =”, b)
print(“c =”, c)
print(“a+b=”, c)
function2(10,20)
‘’’
结果为:
a = 10
b = 20
c = 30
a+b= 30
‘’’

def function3(a=10,b=20): #设置函数的默认值
c = a + b
print(“a =”, a)
print(“b =”, b)
print(“c =”, c)
print(“a+b=”, c)
function3()
‘’’
结果为：
a = 10
b = 20
c = 30
a+b= 30
‘’’
function3(50)
‘’’
结果为：
a = 50
b = 20
c = 70
a+b= 70
‘’’
function3(30,40)
‘’’
结果为：
a = 30
b = 40
c = 70
a+b= 70
‘’’

def function4(a,b=20): # 函数的一个参数没有赋值，另一个赋值
c = a + b
print(“a =”, a)
print(“b =”, b)
print(“c =”, c)
print(“a+b=”, c)
function3(50) #为没有赋值的参数赋值
‘’’
结果为：
a = 50
b = 20
c = 70
a+b= 70
‘’’

a = 1000
def function5(b=20):
global a #使用全局变量
c = a + b
print(“a =”, a)
print(“b =”, b)
print(“c =”, c)
print(“a+b=”, c)
function5()
‘’’
结果为：
a = 1000
b = 20
c = 1020
a+b= 1020
‘’’

def add(a,b):
c = a+b
return c
d= add(1,2)
print(d)