列表操作

li = ['alex',[1,2,3],'wusir','egon','女神','taibai']
 l1 = li[0]
 print(l1)
 l2 = li[1]
 print(l2)
 l3 = li[0:3]
print(l3)

li = ['alex','wusir','egon','女神','taibai']

#增加 append insert
 li.append('日天')
 li.append(1)
 print(li)
 while 1:
     username = input('>>>')
     if username.strip().upper() == 'Q':
         break
     else:
         li.append(username)
 print(li)
 li.insert(4,'春哥')
 print(li)
 li.extend('二哥')
 li.extend([1,2,3])
 print(li)

#删
li = ['taibai','alex','wusir','egon','女神',]
 name = li.pop(1)  # 返回值
 name = li.pop()  # 默认删除最后一个
 print(name,li)

 li.remove('taibai')  # 按元素去删除
 print(li)

 li.clear()  # 清空
 print(li)

 del li
 del li[0:2]  # 切片去删除
 print(li)

#改
 li[0] = '男兽'
 li[0] = [1,2,3]
#切片
 li[0:3] = '云姐plfdslkmgdfjglk'
 li[0:3] = [1,2,3,'春哥','咸鱼哥']
 print(li)

#查
 for i in li:
     print(i)
 print(li[0:2])

#公共方法：

 l = len(li)
 print(l)
num = li.count('taibai')
 print(num)
 print(li.index('wusir'))
 li = [1,5,4,7,6,2,3]
# #正向排序
 li.sort()
 print(li)
# #反向排序
  li.sort(reverse=True)
  print(li)
# #反转
li.reverse()
 print(li)

 #遍历相关

li = ['alex','taibai','wusir','egon']
for i in li:
    print(li.index(i),i)

for index,i in enumerate(li,1):
    print(index,i)