Add support for printf format specification about fmt HOT 5 CLOSED

What is your argument for going for Python's str.format instead of printf in the first place? I'm not familiar with it.

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The problem with printf syntax is when you have type information, much of specification becomes redundant, for example, length specifiers and u. That's because it serves two functions in the original printf - specify output format and specify the type of the argument. But more importantly, the str.format syntax is extensible:

The syntax for format specifiers is open-ended, since a class can override the standard format specifiers. In such cases, the str.format() method merely passes all of the characters between the first colon and the matching brace to the relevant underlying formatting method.

I plan to add a mechanism to create format specifiers for user-defined types. This will be extremely useful for things like dates, complex numbers, etc:

Doing the same with printf would be rather awkward as Boost Format demonstrates.

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Besides everyone loves Python 😄

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👍 seems that Python becomes more popular lately. Thanks.

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Implemented in version https://github.com/cppformat/cppformat/releases/tag/v0.11.0.

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