python可以对元组和字典进行拆包或解包操作。
1、拆包：元组
示例代码1：
def return_num():
return 100, 200
num1, num2 = return_num()
print(num1) # 100
print(num2) # 200
运行结果：
示例代码2：
def return_num1():
return 100, 200
def return_num2():
return 100, 200, 300
def return_num3():
return 100, 200, 300, 400, 500
def func(num1, num2):
print(num1, num2)
def func2(num1, num2, *args):
print(num1, num2, args)
if __name__ == '__main__':
func(*return_num1())
# func(*return_num2()) # 报错：TypeError: func() takes 2 positional arguments but 3 were given
func2(*return_num1())
func2(*return_num2())
func2(*return_num3())
运行结果：
2、拆包：字典
示例代码1：
dict1 = {'name': 'TOM', 'age': 18}
a, b = dict1
# 对字典进⾏拆包，取出来的是字典的key
print(a) # name
print(b) # age
print(dict1[a]) # TOM
print(dict1[b]) # 18
运行结果：
示例代码2：
dic = {'aa': 'AA', 'bb': 'BB'}
dic2 = {'aa': 'AA', 'bb': 'BB', 'cc': 'CC'}
dic3 = {'aa': 'AA'}
def func(aa, bb):
print(aa, bb)
if __name__ == '__main__':
func(**dic)
# func(**dic2) # 此时报错：TypeError: func() got an unexpected keyword argument 'cc'
# func(**dic3) # 此时报错：TypeError: func() missing 1 required positional argument: 'bb'
运行结果：
示例代码3：
dic = {'aa': 'AA', 'bb': 'BB'}
dic2 = {'aa': 'AA', 'bb': 'BB', 'cc': 'CC', 'dd': 'DD'}
dic3 = {'aa': 'AA'}
def func(aa, bb, **kwargs):
print(aa, bb, kwargs)
print(aa, bb, kwargs.get('cc'))
if __name__ == '__main__':
func(**dic)
func(**dic2)
运行结果：
