python str,list,tuple转换

1. str转list
list = list(str)

2. list转str
str= ''.join(list)

3. tuple list相互转换
tuple=tuple(list)
list=list(tuple)

4. tuple 转换为字符串
In [1]: a = ('a',)

In [2]: ''.join(a)
Out[2]: 'a'