python join 和 split方法的使用,join用来连接字符串，split恰好相反，拆分字符串的。
1.join用法示例
>>>li = ['my','name','is','bob']
>>>’ ‘.join(li)
‘my name is bob’
>>>’_’.join(li)
‘my_name_is_bob’
>>> s = ['my','name','is','bob']
>>> ‘ ‘.join(s)
‘my name is bob’
>>> ‘..’.join(s)
‘my..name..is..bob’
2.split用法示例
>>> b = ‘my..name..is..bob’
>>> b.split()
['my..name..is..bob']
>>> b.split(“..”)
['my', 'name', 'is', 'bob']
>>> b.split(“..”,0)
['my..name..is..bob']
>>> b.split(“..”,1)
['my', 'name..is..bob']
>>> b.split(“..”,2)
['my', 'name', 'is..bob']
>>> b.split(“..”,-1)
['my', 'name', 'is', 'bob']
可以看出 b.split(“..”,-1)等价于b.split(“..”)
