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Comments on Why are commas not needed for modulo string formatting when printing?

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Why are commas not needed for modulo string formatting when printing?

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Suppose I have two variables that are called animal and age, and print them as a string in the console like so:

animal = "giraffe"
age = 25

print("A %s can live up to %d years" %(animal,age))

Why shouldn't there be a comma between the string and the %(animal,age) part? Does Python automatically detect that it needs two parameters to execute?

python format-string

posted over 1 year ago

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1y ago by Karl Knechtel‭

Bennshinpoes‭

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1 comment thread

As a side note, the documentation calls it ["Old string formatting"](https://docs.python.org/3/tutori... (1 comment)

hkotsubo‭ wrote over 1 year ago · edited over 1 year ago

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As a side note, the documentation calls it "Old string formatting". Nowadays, you can use str.format method (since Python 2.6) or f-strings (since Python 3.6):

animal = "giraffe"
age = 25

# str.format method
print("A {} can live up to {} years".format(animal, age))

# f-string
print(f"A {animal} can live up to {age} years")