How this code replace the %s in my filename with certain values

Question

I am a beginner of Python.

I am trying to create a text file with using %s (I saw the example from textbook, but I don't know what %s exactly means here:

quizFile=open('%scapitalsquiz.txt'%2018,'w')
quizFile.write('%s. capital of %s?\n'%(1, 'New York'))
quizFile.close()

the above code will give me a text file whose name is: 2018capitalsquiz

so the %s is repalced by %2018

Also in my content of the text file, I have: 1. capital of New York?

so two %s are replaced correspondingly by 1 and New York, I just want to know what is exactly function here?

Possible duplicate of [What does %s mean in Python?](https://stackoverflow.com/questions/997797/what-does-s-mean-in-python) — niraj, May 28 '18 at 02:14
Also since it is tagged as python-3.x, `%s` is old, newer is `.format`. — niraj, May 28 '18 at 02:17

score 0 · Accepted Answer · answered May 28 '18 at 02:17

0

%s is a string formatting syntax. %s token is replaced by whatever you pass to the string after the % symbol. It basically uses the str() method to utilise the string formatting.

answered May 28 '18 at 02:17

Nitin Prakash

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How this code replace the %s in my filename with certain values

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