list

list 是有序的，可变的

str，tuple不可变

str中的count 可切片，

list中的count不可切片

字符串---->list     用split
List---->字符串    用join

d = 'name:a1,age'print(d.split('a'))    ### ['n', 'me:', '1,', 'ge']d2 = ['n', 'me:', '1,', 'ge']print('a'.join(d2))    ### name:a1,age

list1 = ['t1','t2','t1','t3']# 增list1.append()  # 末尾加list1.extend()  # 区别于append，这个可迭代（一个个添加）list1.insert(list1.index('t1')+1,0)    ##按索引加# 删list1.pop()     # 按索引删，有返回值,索引超出范围则报错list1.remove()  # 按元素删,只删遇到的第一个list1.clear()   # 清空列表del list1[2]    # 按索引，切片删# 改list1[0] = 't6'# 按索引改list1[0:2] = '曼珠沙华'# 切片：先删除 后 迭代添加list1[0:2] = ['meng','yang',123]   ###['meng', 'yang', 123, 't1', 't3']# 查# 索引，切片查list1.index() # 按元素查print(list1)

list2 = [1,8,3,6,5,7,9]list2.sort()            # 正序排序  [1,3,5,6,7,8,9]list2.sort(reverse=True)# 倒序排序  [9,8,7,6,5,3,1]list2.reverse()  # 序列翻转  [9,7,5,6,3,8,1]print(list2)tuple可查看可切片不可更改，若元祖里面有列表，可以改列表里面的元素不能排序range(1,10,3)   # 相当于可迭代对象

# ++++++++++++++++++++++++++list3 = ['芳华','绝dai',245,['meijie',1,'nvrenhua']]# list3[1][3:] = '代'     ### 错的list3[1] = list3[1][0:1] + '代'print(list3)list3[3][0] = list3[3][0].upper()print(list3)

将list3 中的数据逐个打印，若遇到子列表也逐个打印list3 = ['芳华','绝dai',245,['meijie',1,'nvrenhua']]

① 

for i in list3:    if type(i) == list:        for j in i:            print(j)    else:        print(i)

②

for i in list3:    if list3.index(i) == 3:        for j in list3[3]:            print(j)    else:        print(i)

③

for i in range(0,len(list3)):    if i == 3:        for j in list3[i]:   # list3[3]            print(j)    else:        print(list3[i])

补充：（列表元祖转化）

tu = (1,2,3)l = list(tu)print(l,type(l))   # [1, 2, 3] <class 'list'>li = [4,5,6]print(tuple(li),type(tuple(li)))   # (4, 5, 6) <class 'tuple'>print(list('abc'))   # ['a', 'b', 'c']