python中字符串拼接的三种方法。

>>> a = "abcd"
>>> b = "xyzm"
>>> a
‘abcd‘
>>> b
‘xyzm‘
>>> a + b
‘abcdxyzm‘

>>> c = ["abcd","xyzm"]
>>> c
[‘abcd‘, ‘xyzm‘]
>>> "".join(c)
‘abcdxyzm‘

>>> a
‘abcd‘
>>> b
‘xyzm‘
>>> "%s%s" % (a,b)
‘abcdxyzm‘