Python序列解包

元组的序列解包
range对象的序列解包
迭代对象的序列解包
列表的序列解包
字典的序列解包
序列解包与遍历
序列解包的其它用法

元组的序列解包

x,y,z = (1,2,3)

print(x,y,z)

1 2 3

a_tuple = 4,5,6   #(4,5,6)

(x,y,z) = a_tuple

print(x,y,z)

4 5 6

range对象的序列解包

x,y,z,m,n = range(5)

print(x,y,z,m,n)

0 1 2 3 4

迭代对象的序列解包

x,y,z,m,n = map(str, range(5))

x,y,z,m,n

('0', '1', '2', '3', '4')

列表的序列解包

x_list = [1,2,3,4,5,6,7]

x0,x1,x2,x3,x4,x5,x6 = x_list

x5

6

x,y,z = sorted([7,32,5])

print(x,y,z)

5 7 32

字典的序列解包

dict1 = {'a':1,'b':2,'c':3}

b,c,d = dict1.items()

print(b,c,d)

('a', 1) ('b', 2) ('c', 3)

b,c,d = dict1

b,c,d

('a', 'b', 'c')

b,c,d = dict1.values()

b,c,d

(1, 2, 3)

序列解包与遍历

keys = ['x1','x2','x3','x4']

values = [1,2,3,4]

for k,v in zip(keys, values):

     print(k,v)

x1 1

x2 2

x3 3

x4 4

x = ['a','b','c']

for index, x_value in enumerate(x):

     print('索引{0}和x的元素{1}'.format(index,x_value))

索引0和x的元素a

索引1和x的元素b

索引2和x的元素c

dict2 = {'a':1,'b':2,'c':3}

for k,v in dict2.items():

     print(k,v)

a 1

b 2

c 3

序列解包的其它用法

print(*[1,2,3,4],5,*(6,7))

1 2 3 4 5 6 7

*range(4),4

(0, 1, 2, 3, 4)

{*range(3),3,4,*(5,6,7)}

{0, 1, 2, 3, 4, 5, 6, 7}

{'x':1,**{'y':2}}

{'x': 1, 'y': 2}