Python 中开发pattern的string模板(template) 实例详解
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:
#-*-coding:utf-8-*-
'''''
Createdon2014.6.5
@author:Administrator
@edition:python3.3.0,eclipsepydev
'''
importstring
t=string.Template('$var')
print(t.pattern.pattern)
classMyTemplate(string.Template):
delimiter='{{'
pattern=r'''''
\{\{(?:
(?P\{\{)|#Escapesequenceoftwodelimiters
(?P[_a-z][_a-z0-9]*)\}\}|#delimiterandaPythonidentifier
{(?P[_a-z][_a-z0-9]*)}\}\}|#delimiterandabracedidentifier
(?P)#Otherill-formeddelimiterexprs
)
'''
t2=MyTemplate('''''
{{{{
{{var}}
''')
print('MATCHES:',t2.pattern.findall(t2.template))
print('SUBSTITUTED:',t2.safe_substitute(var='replacement'))
输出:
\$(?: (?P\$)|#Escapesequenceoftwodelimiters (?P [_a-z][_a-z0-9]*)|#delimiterandaPythonidentifier {(?P [_a-z][_a-z0-9]*)}|#delimiterandabracedidentifier (?P )#Otherill-formeddelimiterexprs ) MATCHES:[('{{','','',''),('','var','','')] SUBSTITUTED: {{ replacement
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