7、列表练习题

names = ['old_driver','rain','jack','shanshan','peiqi','black_girl']   #创建一个空列表，添加元素
names.insert(-1,'alex')  #在black_girl 前插入一个 alex
print(names)

names[3] = '姗姗'  #把shanshan改成中文
print(names)

names2 = ['oldboy','oldgirl']  #在names列表中插入列表['oldboy','oldgirl']
names.insert(2,names2)
print(names)

print(names.index('peiqi')) #返回peiqi的索引值

number = [1,2,3,4,5,6,2]  #创建新列表，并把列表合并到names
names.extend(number)
print(names)

print(names[4:7]) #取出names列表中4-7的元素

print(names[2:10:2])  #取出names2-10的元素，步长为2

print(names[-3:])  #取出names列表中最后三个元素

# for i in names:
#     print(names.index(i),i) #打印出每个元素的索引值和元素

# count = 0
# for i in names:
#     print(count,i)
#     count += 1

# for i in enumerate(names): #枚举
#     print(i)

# for index, i in enumerate(names):
#     print(i)

# for i in names:  #自己写的，想不出来，错的
#     if names.index(i)%2 == 0:
#         names[i] = -1
#         print(names.index(i), i )
# print(names)

# for index, i in enumerate(names):
#     if index%2 ==0:  #是否为偶数，%是整除
#         names[index] = -1
#         print(index,i)
# print(names)