第七章第4讲:python函数的作用域:局部变量与全局变量


1.局部变量:只在函数体内,函数运行之前或运行结束之后,该变量无效

def calculateTax(price,tax_rate):
    print(price)
    taxTotal = price * tax_rate
    return taxTotal

my_price = int(input("Enter a price:"))
totalPrice = calculateTax(my_price,8)
print("Price = ",my_price,",","TotalPrice = ",totalPrice)
# print(price)

 2.全局变量:在主程序(函数外或函数内)到都是生效的

def calculateTax(price,tax_rate):
   print("全局变量Myptice:", my_price)
    taxTotal = price * tax_rate
    return taxTotal

my_price = int(input("Enter a price:"))
totalPrice = calculateTax(my_price,8)
print("Price = ",my_price,",","TotalPrice = ",totalPrice)
print("Myprice = ",my_price)

 

 3.全局变量在函数体内的修改

def calculateTax(price,tax_rate):
    # print(price)
    my_price=100
    print("全局变量Myptice:", my_price)
    taxTotal = price * tax_rate
    return taxTotal

my_price = int(input("Enter a price:"))
totalPrice = calculateTax(my_price,8)
print("Price = ",my_price,",","TotalPrice = ",totalPrice)
print("Myprice = ",my_price)

结果:
Enter a price:3
全局变量Myptice: 100
Price =  3 , TotalPrice =  24
Myprice =  3

 


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