Use Python 3 string formatting. This is still available in earlier versions (from 2.6), but is the 'new' way of doing it in Py 3. Note you can either use positional (ordinal) arguments, or named arguments (for the heck of it I've put them in reverse order.

As of Python 3.11, C-style formatting (with %s, %a and %r) is now as fast as the corresponding f-string expression – TheFungusAmongUs Commented Mar 20, 2022 at 23:14

All of these create the string "01": >python -m timeit "'{:02d}'.format(1)" 1000000 loops, best of 5: 357 nsec per loop >python -m timeit "'{0:0{1}d}'.format(1,2)" 500000 loops, best of 5: 607 nsec per loop >python -m timeit "f'{1:02d}'" 1000000 loops, best of 5: 281 nsec per loop >python -m timeit "f'{1:0{2}d}'" 500000 loops, best of 5: 423 nsec per loop >python -m timeit "str(1).zfill(2 ...

Aug 3, 2010 · Usage of % for formatting strings is no longer encouraged. This method of string formatting is the new standard in Python 3.0, and should be preferred to the % formatting described in String Formatting Operations in new code.

CONST_TAB_WIDTH = 4 ## ## String Library - This library only includes Format Column debugging output format system.. ## class String: ## ## ## def FormatColumnStripR( _width = 25, _text ='', *_varargs ): return String.FormatColumn( _width, _text, *_varargs ).rstrip( ) ## ## ## def FormatSimpleColumnStripR( _width = 25, *_varargs ): return ...

the Python String Format Cookbook: shows examples of the new-style .format() string formatting; pyformat.info: compares the old-style % string formatting with the new-style .format() string formatting; Python 3.6 introduced literal string interpolation (also known as f-strings) so now you can write the above even more succinct as: >>> f'{pi:.2f ...

Note that you have to mix double " and single ' quotes because until Python 3.12, you can't use backslashes to escape quotes in the expression part of an f-string. You can still use backslashes in the outer part of an f-string, so f'{2+2}\n' is fine.

Nov 26, 2010 · So if the intent is just to call str(arg), then %s is sufficient, but if you need extra formatting (like formatting float decimal places) or other coercion, then the other format symbols are needed. With the f-string notation, when you leave the formatter out, the default is str .

Below are a variety of non time-based examples of formatting numbers as strings, and different ways to do so, starting with the existing string format operator (%) which has been around for as long as Python has been around (meaning this solution is …

See also String formatting: % vs. .format vs. f-string literal for in-depth comparison of the most common ways to do this kind of string formatting, and How do I put a variable’s value inside a string (interpolate it into the string)? for a general how-to guide for this kind of string construction.