Python 嵌套

1 要yuanhao的首字母大写  

li = [1,2,5,'taibai','yuanhao',[1,'alex',3,],True]
li[4] = 'Yuanhao'
print(li)

li[4] = 'yuanhao'upper()
print(li)

2 把wang 后边加个yan,并打印出来

li = [ 1,3,4 ,'wang','True',33,'yy']
s1 = li[3].replace('','yan')
s1 = li[3]
li[3] = li[3][0:4] + 'yan'
print(li)

3 把wang 大写

li = [ 1,3,4 ,'wang','True',33,'yy']
li[3] = li[3].upper()
print(li)
[1, 3, 4, 'WANG', 'True', 33, 'yy']

4 列表正常排序注意格式 和前面一样

li = ['1','3','7','5','2','6']
li.sort()
print(li)

['1', '2', '3', '5', '6', '7']

5倒序（反序）.sort(reverse = False)  正常排序    (rerverse = True)倒序，      有区别于reverse 反转

li = ['1','3','7','5','2','6']
li.reverse()
print(li)

['6', '2', '5', '7', '3', '1']

li = ['1','3','7','5','2','6']
li.sort(reverse=True)
print(li)

['7', '6', '5', '3', '2', '1']

51,元祖tupe()

li = （'1','3',['ddd','qwqw',1212],'7','5','2','6'）
只能查看不能修改
[ddd] 能修改  
print(li[4])  '5'

6 range用法  范围 相当于迭代对象，又步长， 

for i in range (1,10):
    print(i)

1
2
3
4
5
6
7
8
9

for i in range (1,10，2):
    print(i)

1
3
5
7
9

li = ['1','3','7',[ 11,33,44,55,], 2 ,'6']
for i in range (0,len(li)):
    if i == 3 :
        for k in (li[3]):
            print(k)
    else:
        print(li[i])

注意 len是长度 是个数字

方法一
li = [1,3,4,'alex',[3,7,8,'taibai'],5,2]

for i in li :
    if type(i) == list :
        for a in i:
            print(a)
    else:
        print(i)

方法2
for i in range (0 ,len(li)):
    if i == 4:
        for a in li[i] :
            print(a)
    else :
        print(li[i])
打印100 到1  的用法：

for i in range (100,0,-1)
　　print(i)