元组

#!/usr/bin/env python 
# -*- coding:utf-8 -*-
# 元组:又叫只读列表 可循环查询,可切片  ps:儿子不能变,孙子可能可以变

tu = (1, 2, 3, 'alex', [2, 3, 4, 'taibai'], 'egon')
print(tu[3])
print(tu[0:4])
for index in tu:
    print(index)

print(tu)
tu[4][3] = tu[4][3].upper() 
# 能修改的原因是,这步操作的对象是一个list
print(tu)

tu[4].append('sb')
print(tu)

s = 'alex'
s1 = '_'.join(s) 
# 在可迭代对象中添加连接符
# iterable:可迭代对象,除了数字和布尔
print(s1)

# 字符串 列表互相转换
li = ['xiaohu', 'alex',  'wusir','tiger', '女神']
s = '+++'.join(li) 
# join返回的是一个字符串
print(s)
list_s = s.split('+++')
print(list_s)

# range[1,2,3,4,......,1000,.....],顾头不顾尾

for i in range(0, 10, 3):
    print(i)

for i in range(10, 0, -1):
    print(i)

for i in range(0, 10, -1):
    print(i)

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