元祖

#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)

s = 'alex'
s1 = 'sb'.join(s)
print(s1)
#列表转化成字符串  list -----> str    join
li = ['taibai','alex','wusir','egon','女神',]
s = '++++'.join(li)
#str ----->list   split()
print(s)


#range  [1,2,3,4,5,6,.......100........]
#顾头不顾尾，
for i in range(3,10):
     print(i)
for i in range(10):
     print(i)
for i in range(0,10,3):
     print(i)
#运行不报错
for i in range(0, 10, -1):
         print(i)

for i in range(10,0,-2):
     print(i)
for i in range(10,-1,-2):
     print(i)

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