Python 中开发pattern的string模板(template) 实例详解
发布时间:2020-12-17 08:32:13 所属栏目:Python 来源:网络整理
导读: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 -*- ''''' Created on 2014.6.5 @author: A
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 -*- ''''' 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: $(?: (?P<escaped>$) | # 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 感谢阅读,希望能帮助到大家,谢谢大家对本站的支持! (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |