Python apend & extend 使用说明

列表操作

append()函数

a.append(b)：是将b原封不动的追加到a的末尾上，会改变a的值，其中，b可为列表、元组、字符串、一串数/字符/字符串

append 列表

a = [1, 2, 3]
b = ['a','b']
a.append(b)
print(a) # [1, 2, 3, ['a', 'b']]

append 元组

a = [1, 2, 3]
b = ('a','b')
a.append(b)
print(a) # [1, 2, 3, ('a', 'b')]

append 字符串

a = [1, 2, 3]
b = 'nice'
a.append(b)
print(a) # [1, 2, 3, 'nice']

一串数/字符/字符串
会将b转化为元组追加到a的末尾上

数字

a = [1, 2, 3]
b = 9,6
a.append(b)
print(a) # [1, 2, 3, (9, 6)]

字符

a = [1, 2, 3]
b = 'a','b'
a.append(b)
print(a) # [1, 2, 3, ('a', 'b')]

字符串

a = [1, 2, 3]
b = 'nice','hi'
a.append(b)
print(a) # [1, 2, 3, ('nice', 'hi')]

extend()函数

a.extend(b)：是将b拆开后追加到a的末尾上，会改变a的值，其中，b可为列表、元组、字符串、一串数/字符/字符串

列表

a = [1, 2, 3]
b = ['a','b']
a.extend(b)
print(a) # [1, 2, 3, 'a', 'b']

元组

a = [1, 2, 3]
b = ('a','b')
a.extend(b)
print(a) # [1, 2, 3, 'a', 'b']

字符串

a = [1, 2, 3]
b = 'nice'
a.extend(b)
print(a) # [1, 2, 3, 'n', 'i', 'c', 'e']

一串数/字符/字符串

数字

a = [1, 2, 3]
b = 9,6
a.extend(b)
print(a) # [1, 2, 3, 9, 6]

字符

a = [1, 2, 3]
b = 'a','b'
a.extend(b)
print(a) # [1, 2, 3, 'a', 'b']

字符串

a = [1, 2, 3]
b = 'nice','word'
a.extend(b)
print(a) # [1, 2, 3, 'nice', 'word']

说明：字符串和元组中都没有append()和extend()函数

a = [1, 2, 3]
b = 'nice','word'
tt = {'name':'令狐冲','age':25}
a.extend(tt)
print(a) # [1, 2, 3, 'name', 'age']

字典extend 只进行 key 的 extend

a = [1, 2, 3]
b = 'nice','word'
tt = {'name':'令狐冲','age':25}
a.append(tt)
print(a) #[1, 2, 3, {'name': '令狐冲', 'age': 25}]

 对字典进行append KV 作为整体进来了