Python字符串模板

2019-11-11 02:38:55

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由于新式的字符串Template 对象的引进使得string 模块又重新活了过来，Template 对象有两个方法,substitute()和safe_substitute().前者更为严谨,在key 缺少的情况下它会报一个KeyError 的异常出来，而后者在缺少key 时，直接原封不动的把字符串显示出来.

>>> from string import Template>>> s = Template('There are ${howmany} ${lang} Quotation Symbols')>>>>>> PRint s.substitute(lang='Python', howmany=3)There are 3 Python Quotation Symbols>>>>>> print s.substitute(lang='Python')Traceback (most recent call last):File "<stdin>", line 1, in ?File "/usr/local/lib/python2.4/string.py", line 172, in substitutereturn self.pattern.sub(convert, self.template)File "/usr/local/lib/python2.4/string.py", line 162, in convert val =mapping[named]KeyError: 'howmany'>>>>>> print s.safe_substitute(lang='Python')There are ${howmany} Python Quotation Symbols

也可以使用一个字典来作为替代key的数据结构传入

from string import Templates = Template('There are ${howmany} ${lang} Quotation Symbols')repDict = {'lang' : 'Python', 'howmany' : 3}print s.substitute(repDict) #There are 3 Python Quotation Symbols

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