python-列表方法(44)

# >>> alist= [1,2,3,'bob','alice']
# >>> alist[0] = 10   #列表脚标为0的字符改为10
# >>> alist
# [10, 2, 3, 'bob', 'alice']
# >>> alist[1:3] = [20,30]    #将列表脚标为1，2(不包括3)的字符改为20和30
# >>> alist
# [10, 20, 30, 'bob', 'alice']
# >>> alist[2:2] = [22,24,26,28]  #在脚标为2的后面再加字符
# >>> alist
# [10, 20, 22, 24, 26, 28, 30, 'bob', 'alice']
#
# >>> alist.append(100)   #向alist列表中加入字符100
# >>> alist
# [10, 20, 22, 24, 26, 28, 30, 'bob', 'alice', 100]
# >>> alist.remove(24)    #移除alist列表中24这个字符
# >>> alist
# [10, 20, 22, 26, 28, 30, 'bob', 'alice', 100]
# >>> alist.index('bob')  #查看脚标
# 6
# >>> blist = alist.copy()
# >>> blist
# [10, 20, 22, 26, 28, 30, 'bob', 'alice', 100]
# >>> alist.insert(1,15)  #向列表的脚标为1的字符后面加入字符15
# >>> alist
# [10, 15, 20, 22, 26, 28, 30, 'bob', 'alice', 100]
# >>> alist.pop() #默认弹出列表最后一个字符
# 100
# >>> alist
# [10, 15, 20, 22, 26, 28, 30, 'bob', 'alice']
# >>> alist.pop(2)    #弹出列表的脚标为2的字符
# 20
# >>> alist
# [10, 15, 22, 26, 28, 30, 'bob', 'alice']
# >>> alist.pop(alist.index('bob'))   #弹出字符...
# 'bob'
# >>> alist
# [10, 15, 22, 26, 28, 30, 'alice']
# >>> alist.sort()    #排序，类型不同，所以报错
# Traceback (most recent call last):
#   File "<stdin>", line 1, in <module>
# TypeError: '<' not supported between instances of 'str' and 'int'
# >>> alist.reverse() #列表顺序反转
# >>> alist
# ['alice', 30, 28, 26, 22, 15, 10]
# >>> alist.count(20) #统计20在列表中的个数
# 0
# >>> alist.clear()   #清除列表的内容
# >>> alist
# []
# >>> alist.append('new') #向列表中追加内容
# >>> alist
# ['new']
# >>> alist.extend('new') #单纯的字符串会被拆开
# >>> alist
# ['new', 'n', 'e', 'w']
# >>> alist.extend(['hello','word','hehe'])
# >>> alist
# ['new', 'n', 'e', 'w', 'hello', 'word', 'hehe']