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定制pattern的string模板(template) 详解
string.Template的pattern是一个正则表达式, 可以通过覆盖pattern属性, 定义新的正则表达式.
如: 使用新的定界符"{{", 把{{var}}作为变量语法.
代码:
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33# -*- 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<escaped>{{) | # Escape sequence of two delimiters
(?P<named>[_a-z][_a-z0-9]*)}} | # delimiter and a Python identifier
{(?P<braced>[_a-z][_a-z0-9]*)}}} | # delimiter and a braced identifier
(?P<invalid>) # Other ill-formed delimiter exprs
)
'''
t2 = MyTemplate('''''
{{{{
{{var}}
''')
print('MATCHES: ', t2.pattern.findall(t2.template))
print('SUBSTITUTED: ', t2.safe_substitute(var='replacement'))
输出:
? 1 2 3 4 5 6 7 8 9 10 11 $(?:
(?P<escaped>$) | # Escape sequence of two delimiters
(?P<named>[_a-z][_a-z0-9]*) | # delimiter and a Python identifier
{(?P<braced>[_a-z][_a-z0-9]*)} | # delimiter and a braced identifier
(?P<invalid>) # Other ill-formed delimiter exprs
)
MATCHES: [('{{', '', '', ''), ('', 'var', '', '')]
SUBSTITUTED:
{{
replacement
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原文链接：http://blog.csdn.net/caroline_wendy/article/details/28625179