【Python爬虫】- 第4天列表、元组、集合练习题

一、定义列表:list1 = ['life','is','short'],

           list2 = ['you','need','python']

   完成以下几个要求：

1）输出python及其下标

list1 = ['life','is','short']
list2 = ['you','need','python']
print(list2.index('python'))

2）在list2后追加 '!' , 在 'short' 后添加 ',' 

list1 = ['life','is','short']
list2 = ['you','need','python']
n=list1.index('short')
list1.insert(n+1,',')
print(list1)

3）将两个字符串合并后，排序并输出其长度

list1 = ['life','is','short']
list2 = ['you','need','python']
list1.extend(list2)
print(len(list1))
print(list1,list1.sort())

4）将 'python' 改为 'python3'

list1 = ['life','is','short']
list2 = ['you','need','python']
list2[list2.index('python')]='python3'
print(list2)

4）移除之前添加的 '!' 和 ','

list1 = ['life','is','short',',']
list2 = ['you','need','python','!']
list1.remove(',')
list2.remove(list2[list2.index('!')])
print(list1,list2)

二、自己定义元组并练习常用方法（输出元组长度、指定位置元素等）

tup1 = (1,2,3,4,5,6,7)
tup2 = ('you', 'need', 'python')
print(tup1[0])
print(len(tup2))

三、定义列表：

     list1 = ['life','is','short'],

     list2 = ['you','need','python']

     list3 = [1,2,3,4,5,3,4,2,1,5,7,9]

   完成以下操作：

1）构造集合 list_set1

list1 = ['life', 'is', 'short']
list2 = ['you', 'need', 'python']
list3 = [1, 2, 3, 4, 5, 3, 4, 2, 1, 5, 7, 9]
list_set1=set(list1+list2+list3)
print(list_set1)

2）将list1和list2合并构造集合 list_set2

list1 = ['life', 'is', 'short']
list2 = ['you', 'need', 'python']
list3 = [1, 2, 3, 4, 5, 3, 4, 2, 1, 5, 7, 9]
list_set2=set(list1+list2)
print(list_set2)

3）输出两个集合的长度

list_set1=set(list1+list2+list3) list_set2=set(list1+list2) print(len(list_set1),len(list_set2))

4）将两个集合合并后移除 'python'

list_set1.update(list_set2)
list_set1.remove('python')
print(list_set1)

5）在合并后的新列表中添加 'python3'

list_set1.add('python3')
print(list_set1)