python实现php的explode和implode

php的explode和implode很方便，python没有这两个函数，不过python有split和join

实现explode

>>> str = 'a|b|c|d|e'

>>> str.split("|")

['a', 'b', 'c', 'd', 'e']

实现implode

>>> list = ['a', 'b', 'c', 'd', 'e']

>>> "|".join(list)

'a|b|c|d|e'