[Python] How to convert string to int in Python?

I am reading a number from a text file and trying to convert it into an int but it keeps giving me errors. This is my code:

f = open('commentcount.txt', 'r')
counts = f.readline()
int(counts)
counts = counts + 1
print(counts)


I am getting this error:

counts = counts + 1
TypeError: Can't convert 'int' object to str implicitly


What am I doing wrong?

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