替换字符串中的子串
任务:
给定一个字符串,通过查询一个字符串替换字典,将字符串中被标记的子字符串替换掉。
解决方案:
>>> import string
>>> new_style = string.Template('this is $thing')
#给substitute 方法传入一个字典参数并调用
>>> print new_style.substitute({'thing':5})
this is 5
>>> print new_style.substitute({'thing':'test'})
this is test
#关键字参数,并调用
>>> print new_style.substitute(thing = 5)
this is 5
>>> print new_style.substitute(thing = 'test')
this is test