python string格式（）与dict与整数键 [英] python string format() with dict with integer keys

问题描述

我想使用Python字符串的格式（）作为一个快速而肮脏的模板。但是，我想使用的 dict 具有整数的（字符串表示）的键。一个简化的例子如下：

I would like to use Python string's format() to act as a quick and dirty template. However, the dict that I would like to use has keys which are (string representations) of integers. a simplified example follows:

s = 'hello there {5}'
d = {'5': 'you'}
s.format(**d)

上述代码抛出以下错误：

the above code throws the following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: tuple index out of range

是否可以执行上述？ p>

is it possible to do the above?

推荐答案

我们已经确定它将无法正常工作，但解决方案如何：

We've established that it won't work, but how about a solution:

虽然 str.format 在这种情况下不起作用，但是，旧的％格式化将很有趣。不建议这样做，但是您确实要求提供一个简单肮脏的模板。

Although str.format won't work in this case, funnily enough the old % formatting will. This is not recommended, but you did ask for a quick and dirty template.

>>> 'hello there %(5)s' % {'5': 'you'}
'hello there you'

请注意，这不会对整数键有效。

Do note though that this won't work for integer keys.

>>> 'hello there %(5)s' % {5: 'you'}

Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    'hello there %(5)s' % {5: 'you'}
KeyError: '5'

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