day 04 list,元祖

1,作业讲解

 # s = '132a4b5c'
 # s1 = s[0]+s[2]+s[1]
 # print(s1)

 index = 0
 # while 1:
 #     print(s[index])
 #     index+=1
 #     if index == len(s):break

 # 如: conten = input ('请输入内容)

 # 如果用户输入：5+9  或 5+ 9或5 + 9,然后进行分割计算
 # content = input('>>>').strip()
 # index = content.find('+')
 # a =  int (content[0:index])
 # b =  int(content[index+1:])
 # print(a+b)

 # 任意输入一串文字+数字，统计出数字的个数
 s = input('请输入：')
 count = 0
 for i in s:
     if i.isdigit():
         count += 1
 print(count)
 # #使用while和for循环分别打印字符串s='fkld'中的每个元素
 # s='asferd'
 # for i in  s:
 #     print(i)
 #while

 # 

2.list相关内容

1.list基础操作

 # 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)

2.append增加

 # li = ['alex',[1,2,3],'wusir','egon','女神','taibai']
 # li.append('日天')
 # li.append(1)
 # print(li)
 # li = ['alex',[1,2,3],'wusir','egon','女神','taibai']
 # while 1:
 #     yuangong=input('输入姓名：')
 #     if yuangong.strip().upper()== 'Q':
 #         break
 #         li.append('yuangong ')
 # print(li)

（1）指定位置添加

# li = ['alex',[1,2,3],'wusir','egon','女神','taibai']
# li.insert(4,'春哥')
# print(li)

（2）迭代添加

 # li = ['alex',[1,2,3],'wusir','egon','女神','taibai']
 # li.extend('二哥')
 # li.extend('1,2,3')
 # print(li)

3.删除

 # li = ['alex',[1,2,3],'wusir','egon','女神','taibai']
 # name=li.pop(1) #返回值
 # # name=li.pop()#默认删除最后一个
 # print(name,li)

（1）按元素删除

 #li.remove('taibai)#按元素删
 #print(li)

（2）清空

 #li.clear()#清空
 #print(li)

（3）切片删除

#del li
# li = ['alex',[1,2,3],'wusir','egon','女神','taibai']
# del li[0:2]#切片删除
# print(li)

4.改

 # li[0] = '男神'
 # li[0] = [1,2,3]
 #切片
 # li[0:3] = '云姐hahhakdkald'
 # li[0:3] = [1,2,3,'春哥','泰格']
 # print(li)

5.查

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

6.公共发方法

 # l = len(li)
 # print(l)
 # num=li.count('taibai')
 # print(num)
 # print(li.index('wusir'))

 # li = [1,4,2,6,3]
 #正序排序
 # li.sort()
 # print(li)
 #反向排序
 # li.sort(reverse=True)
 # print(li)
 #反转
 # li.reverse()
 # print(li)

7.列表嵌套

 li = ['taibai','武藤兰','苑昊',['alex','egon',89],23]
 # print(li[1][1])
 # print(li[0].capitalize())
 # name=li[0].capitalize()
 # li[0]=name
 # print(li)
 # li[2]='苑日天'
 # print(li)
 # li[2]=li[2].replace('昊','日天')
 # print(li)
 li[3][0]=li[3][0].upper()
 print(li)li = ['taibai','武藤兰','苑昊',['alex','egon',89],23]
 # print(li[1][1])
 # print(li[0].capitalize())
 # name=li[0].capitalize()
 # li[0]=name
 # print(li)
 # li[2]='苑日天'
 # print(li)
 # li[2]=li[2].replace('昊','日天')
 # print(li)
 li[3][0]=li[3][0].upper()
 print(li)

3.元祖相关内容

1.元祖基础操作

 #元祖 只读列表 ，可循环查询，可切片
 #儿子不能改，孙子可能可以改
 #
 # tu = (1,2,3,'alex',[2,3,4,'taibai'],'egon')
 # print(tu[3])
 # print(tu[0:4])
 # for i in tu:
 #     print(i)
 # tu[4][3]=tu[4][3].upper()
 # print(tu)
 # tu[4].append('sb')
 # print(tu)

2.字符连接

 # s='alex'
 #字符连接
 # s1='_'.join(s)
 # print(s1)

3.list——>str

str——>list

#列表转化成字符串 list——>str  join
# li = ['alex', 'wusir', 'egon', '女神', 'taibai']
# s = '####'.join(li)
#
# #str——>list  split()
# print(s)

4.range

 #range
 # for i in range(0,100):
 #     print(i)
 # for i in range(100):
 # #     print(i)
 # for i in range(0,100,3):
 #     print(i)
 # for i in range(100,0,-2):
 #     print(i)
 # for i in range(100,-1,-2):
 #     print(i)

5,打印列表元素，并且打印元素是列表里的元素

 li=[1,2,3,5,'alex',[2,3,4,5,'alex'],'afds']
 #
 # for i in li:
 #     if type(i)==list:
 #       for j in i:
 #           print(j)
 #     else:
 #      print(i)
 for i in range(len(li)):
      if type(li[i]) == list:
          for j in li[i]:
              print(j)
      else:
          print(li[i])
 # for i in li:
 #     if type(i) == list:
 #         for k in i:
 #             print(k)
 #     else:print(i)