class forDatas:
  def __init__(self):
    pass
  def str_list_tuple(self):
    s = 'abcde12345'
    print('s:', s, type(s))
    # str to list
    l = list(s)
    print('l:', l, type(l))
    # str to tuple
    t = tuple(s)
    print('t:', t, type(t))
    # str转化为list/tuple，直接进行转换即可
    # 由list/tuple转换为str，则需要借助join()函数来实现
    # list to str
    s1 = ''.join(l)
    print('s1:', s1, type(s1))
    # tuple to str
    s2 = ''.join(t)
    print('s2:', s2, type(s2))

 """
    S.join(iterable) -> str
    
    Return a string which is the concatenation of the strings in the
    iterable. The separator between elements is S.
    """

s = 'asdf1234'
sss = '@'.join(s)
print(type(sss), sss)