python拆包、交换变量的值

def get_my_info():
    high = 178
    weight = 100
    age = 18
    return high, weight, age


# result = get_my_info()
# print(result)

my_high, my_weight, my_age = get_my_info()
print(my_high)
print(my_weight)
print(my_age)

总结：

• 拆包时要注意，需要拆的数据的个数要与变量的个数相同，否则程序会异常

• 除了对元组拆包之外，还可以对列表、字典等拆包

    In [17]: a, b = (11, 22)
    In [18]: a
    Out[18]: 11
    In [19]: b
    Out[19]: 22
  
    In [20]: a, b = [11, 22]
    In [21]: a
    Out[21]: 11
    In [22]: b
    Out[22]: 22
  
    In [23]: a, b = {"m":11, "n":22}  # 取出来的是key，而不是键值对
    In [24]: a
    Out[24]: 'm'
    In [25]: b
    Out[25]: 'n'
  

<2> 交换2个变量的值

# 第1种方式
# a = 4
# b = 5
# c = 0
#
# c = a
# a = b
# b = c
#
# print(a)
# print(b)

# 第2种方式
# a = 4
# b = 5
# a = a+b  # a=9, b=5
# b = a-b  # a=9, b=4
# a = a-b  # a=5, b=4
# print(a)
# print(b)

# 第3种方式
a, b = 4, 5
a, b = b, a

print(a)
print(b)