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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)" 1000000 loops, best of 5: 271 nsec per loop >python Python 3.8.1 (tags/v3.8.1:1b293b6, Dec 18 2019, 23 ...
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
%s indicates a conversion type of string when using Python's string formatting capabilities. More specifically, %s converts a specified value to a string using the str() function. Compare this with the %r conversion type that uses the repr() function for value conversion. Take a look at the documentation for string formatting.
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 ...
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 .
Apr 15, 2011 · For a flexible method that works even when formatting complicated string, you probably should use the string-formatting mini-language, using either f-strings >>> f'{"Hi": <16} StackOverflow!' # Python >= 3.6 'Hi StackOverflow!' or the str.format() method
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.
Dec 3, 2008 · Python string formatting with 'n' number of digits (when using keys) Python 2.7. 0. How to start a Python ...
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 compatible across Python 1.x, 2.x, and 3.x):
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.
