Python Template Demo

#templates.py import fileinput,re #匹配中括号里的字段 field_pat=re.compile(r'/[(.+?)/]') #将变量收集到这里 scope={} #用于re.sub中 def replacement(match): code=match.group(1) try: #如果字段可以求值,返回它 return str(eval(code,scope)) except SyntaxError: # 否则执行相同作用域内的赋值语句 exec code in scope #... ...返回空字符串 return '' #将所有文本以一个字符串的形式获取： lines=[] for line in fileinput.input(): lines.append(line) text=''.join(lines) #将field模式的所有匹配项都替换掉: print text print field_pat.sub(replacement,text)

测试文件:magnu.txt,template.txt

[name = 'Magnus Lie Hetland' ] [email = '[e-mail]' ] [language = 'python' ]

[import time] Dear [name], I would like to learn how to program. I hear you use the [language] language a lot -- is it something I should consider? And, by the way, is [email] your correct email address? Fooville, [time.asctime()] Oscar Frozzbozz

 

运行程序:python templates.py magnus.txt template.txt

Result:

Dear Magnus Lie Hetland, I would like to learn how to program. I hear you use the python language a lot -- is it something I should consider? And, by the way, is [e-mail] your correct email address? Fooville, Fri Mar 18 20:00:37 2011 Oscar Frozzbozz