String formatting in Python for today standards [duplicate]

Question

i'm learning python from a book that i bought in 2017 and from a online course at the same time.

The book says that i should format the string like this example;

print("Guess number %d of %d" % (variable1, variable2))

But the online course says that i should format this way;

print("Guess number {} of {}".format(variable1, variable2))

Which one should i use for today programming standards?

CDJB · Accepted Answer · 2019-12-09 14:23:32Z

4

Well, from Python 3.6, you can use f-strings:

print(f"Guess number {variable1} of {variable2}")

answered Dec 9, 2019 at 14:23

CDJB

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1 Comment

JL Peyret Over a year ago

curiosity. There is one other major difference too, isn’t there? an f-string is built and replaced on the spot, with local variables. whereas a %-based, or a $-based, template can be saved and used elsewhere/later. I ask that because I have code that relies heavily on building complex templates and passing them around as parameters. So I’ve always seen f-strings as nice (and fast) but not always flexible enough.

Jay_jen · Accepted Answer · 2019-12-09 14:45:29Z

I'd predict the use are f-strings are aimed at readability. That said, i would say the real answer is which ever one is more readable in your function or whatever.

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