定制pattern的string模板(template) 詳解

本文地址:?http://blog.csdn.net/caroline_wendy/article/details/28625179

string.Template的pattern是一個正則表達式, 可以通過覆蓋pattern屬性, 定義新的正則表達式.

如: 使用新的定界符"{{", 把{{var}}作為變量語法.

代碼:

# -*- coding: utf-8 -*-

‘‘‘

Created on 2014.6.5

@author: Administrator

@edition : python 3.3.0, eclipse pydev

‘‘‘

import string

t = string.Template(‘$var‘)

print(t.pattern.pattern)

class MyTemplate(string.Template):

delimiter = ‘{{‘

pattern = r‘‘‘

\{\{(?:

(?P\{\{) | # Escape sequence of two delimiters

(?P[_a-z][_a-z0-9]*)\}\} | # delimiter and a Python identifier

{(?P[_a-z][_a-z0-9]*)}\}\} | # delimiter and a braced identifier

(?P) # Other ill-formed delimiter exprs

)

‘‘‘

t2 = MyTemplate(‘‘‘

{{{{

{{var}}

‘‘‘)

print(‘MATCHES: ‘, t2.pattern.findall(t2.template))

print(‘SUBSTITUTED: ‘, t2.safe_substitute(var=‘replacement‘))

輸出:

\$(?:

(?P\$) | # Escape sequence of two delimiters

(?P[_a-z][_a-z0-9]*) | # delimiter and a Python identifier

{(?P[_a-z][_a-z0-9]*)} | # delimiter and a braced identifier

(?P) # Other ill-formed delimiter exprs

)

MATCHES: [(‘{{‘, ‘‘, ‘‘, ‘‘), (‘‘, ‘var‘, ‘‘, ‘‘)]

SUBSTITUTED:

{{

replacement

總結

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