Python Cookbook学习记录 ch1_17_2013/10/25

1.16替换字符串中的字串

给定一个字符串，通过查询一个替换字典，将字典中被标记的子字符串替换掉

>>> new_style = string.Template('this is $fst and this is $snd')
>>> print new_style.substitute(fst=5,snd=10)
this is 5 and this is 10
>>> print new_style.substitute({'fst':5,'snd':10})
this is 5 and this is 10

文中还举了一个例子，其中两个$可以代表$：

>>> form_letter = '''Dear $customer,
I hope you are having a great time.
If you do not find Room $room to your satisfaction,
let us know. Please accept this $$5 coupon.
            Sincerely,
            $manager
            ${name}Inn'''
>>> letter_template = string.Template(form_letter)
>>> print letter_template.substitute({'name':'Sleepy', 'customer':'Fred Smith',
                                  'manager':'Barney Mills', 'room':307,
                                 })
Dear Fred Smith,
I hope you are having a great time.
If you do not find Room 307 to your satisfaction,
let us know. Please accept this $5 coupon.
            Sincerely,
            Barney Mills
            SleepyInn