如何使用Python轻松将变量扩展为字符串? [英] How do I use Python to easily expand variables to strings?

问题描述

这样做有什么好习惯?

代替: print "%s is a %s %s that %s" % (name, adjective, noun, verb)

我希望能够做到以下几点: print "{name} is a {adjective} {noun} that {verb}"

I want to be able to do something to the effect of: print "{name} is a {adjective} {noun} that {verb}"

推荐答案

"{name} is a {adjective} {noun} that {verb}".format(**locals())

• locals()提供对当前名称空间的引用(作为字典).
• **locals()将该字典解压缩为关键字参数(f(**{'a': 0, 'b': 1})为f(a=0, b=1)).
• .format()是新字符串格式" ，它可以顺便说一句，可以做更多的事情(例如，第一个位置参数的name属性的{0.name}).
• locals() gives a reference to the current namespace (as a dictionary).
• **locals() unpacks that dictionary into keyword arguments (f(**{'a': 0, 'b': 1}) is f(a=0, b=1)).
• .format() is "the new string formatting", which can by the way do a lot more (e.g. {0.name} for the name attribute of the first positional argument).

或者， string.template (同样，如果您是本地人，想要避免多余的{'name': name, ...} dict文字).

Alternatively, string.template (again, with locals if you want to avoid a redundant {'name': name, ...} dict literal).

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