字符串和list互转
str to list:
>>> str = "123456"
>>> list(str)
['1', '2', '3', '4', '5', '6']
>>> str2 = "123 abc hello"
>>> str2.split() #按空格分割成字符串
['123', 'abc', 'hello']
或者
>>> str2.split(" ")
['123', 'abc', 'hello']
list to str:
方法： ''.john(list)
如：
>>> list = ['a','b','c']
>>> ''.join(list)
'abc'
另外：
>>> lst = [1, 2, 3, 4, 5]
>>> ''.join(lst)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: sequence item 0: expected str instance, int found
>>>
>>> ''.join(str(s) for s in lst) #修改lst中的元素为str
'12345'
>>> ls = [1,2,3,None,"NULL"]
>>> print (','.join(str(s) for s in ls if s not in [None,"NULL"]))
1,2,3
参考链接：
https://www.cnblogs.com/justdo-it/articles/8297303.html
