如何在Python中将MAP中的值替换为字符串模板

Question

I have a string with placeholders. I want to substitute values for that placeholders and those values are stored in a MAP (dictionary). I am using following code

from string import Template

values = {'what': 'surreal', 'punctuation': 'is'}
t = Template(" Hello, $what world $punctuation One of Python least-used functions is ")
t.substitute(values)

print t

This want give me correct results

My output should be:

Hello, surreal world is One of Python least-used functions is

Could you give me your opinion on how to do this ?

Answer 1

I would recommend using a template engine like Genshi . This gives you more flexibility and well they are designed to do this :-)

Genshi example based on http://genshi.edgewall.org/wiki/Documentation/0.6.x/templates.html :

>>> from genshi.template import TextTemplate
>>> tmpl = TextTemplate('Hello, ${dict.what} world ${dict.punctuation} One of Python least-used functions is')
>>> stream = tmpl.generate(dict={'what':'surreal', 'punctuation':'is'})
>>> print(stream)
Hello, surreal world is One of Python least-used functions is

It's also easy to create some markup by using genshi.template.MarkupTemplate .

I also recommend to separate the template from the code, you can use file-like objects for TextTemplate or MarkupTemplate .

Answer 2

You can just use string format for your example:

values = {'what': 'surreal', 'punctuation': 'is'}
template=" Hello, {what} world {punctuation} One of Python least-used functions is "
t = template.format(**values)
print(t)
# Hello, surreal world is One of Python least-used functions is