%d within print statement python

Question

I encountered this in a function of a program and I don't understand how the %d can work inside a closed quote print statement.

print "%d squared is %d." % (n, squared)

The output when the argument of 10 (which is n) is passed is: 10 squared is 100

See Format Specifiers(docs.python.org/2/library/stdtypes.html#string-formatting) — shaktimaan
– shaktimaan, Commented Jul 3, 2015 at 6:08
That's some very basic Python, look it up in the manual or the tutorial you use. — Yu Hao
– Yu Hao, Commented Jul 3, 2015 at 6:08
What is the issue you're having? n and squared are both number variables, which replace the %d in the string passed to print. (That's what the % in ... d." % (n, ... is used for). — Jerska
– Jerska, Commented Jul 3, 2015 at 6:08
I'm voting to close this question as off-topic because it can be answered with a simple google search. — Yu Hao
– Yu Hao, Commented Jul 3, 2015 at 6:09
The % operator is string formating - it has nothing to do with the print statement. — cdarke
– cdarke, Commented Jul 3, 2015 at 6:16

user3636636 · Accepted Answer · 2015-07-03 06:22:10Z

1

The "%" operator is used to format a set of variables enclosed in a tuple (a fixed size list), together with a format string.

print ("%d squared is %d" % (10, 10*10))

The % operators in the string are replaced in order by the elements in the tuple.

%d is used for integers, where as %s is used for strings

Eg.

>>>name = "John"
>>>age = 23
>>>print "%s is %d years old." % (name, age)
John is 23 years old.

edited Jul 3, 2015 at 6:22

answered Jul 3, 2015 at 6:11

user3636636

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1 Comment

Emmy Ebanks Over a year ago

Thank you so much. I am a programming newbie. I did a google search btw. I thought it needed to be enclosed in () to do the replacing action but I guess it doesn't. You can delete this question if you want.. Thanks again for your explantion. Cheers

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