>>>L = [1, 2, 3]

[1, 2, 3]

>>>L = list('spam')      # str

['s', 'p', 'a', 'm']

>>>L = list(range(1, 5))    # range

[1, 2, 3, 4]

>>>L = list(map(ord, 'spam'))   # map

[115, 112, 97, 109]

>>>L = [1, 2, 3, 4]

>>>L[1:2] = [5, 6]      # 等号右边不一定只能是数组，只要是一个可迭代对象就行

>>>L

[1, 5, 6, 3, 4]

>>>L[:0] = [7, 8]      # 在头部插入

>>>L

[7, 8, 1, 5, 6, 3, 4]

>>>L[len(L):] = [9, 10]   # 在尾部插入

>>>L

[7, 8, 1, 5, 6, 3, 4, 9, 10]

>>>L[:] = []    # 删除全部元素

>>>L

[]

>>>L = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

>>>L[1::2] = [11, 12, 13, 14, 15]       # slice赋值同样支持步长，但是如果=两边的序列个数不匹配，则会报错

>>>L

[1, 11, 3, 12, 5, 13, 7, 14, 9, 15]

# 连接符+创建一个新的list，不改变原来的

>>>A = [1, 2]

>>>B = [3, 4]

>>>A + B

[1, 2, 3, 4]

>>>A

[1, 2]

>>>B

[3, 4]

# apend接收的参数是一个对象，并且返回值为None

>>>A = [1, 2]

>>>R = A.append([3, 4])

>>>A

[1, 2, [3, 4]]

>>>R     # 什么也不会打印

# extend 接收的参数是一个可迭代对象，并且返回值是None

>>>A = [1, 2]

>>>R = A.extend([3, 4])

>>>A

[1, 2, 3, 4]

>>>R   # 什么也不会打印