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@PythonPr Answer: 125
Solution: a looks like a number, but it's not!
The quotes around it make it a string - a sequence of characters.
But, int(a) converts it from string to an integer, so b is now the int 123. You can do arithmetic operations on it.
Printing b+2 prints 123+2, ie, 125.
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@PythonPr a compiler error. I'm coming from c# though
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@PythonPr 125
b turns a into an integer
Then we have 123 + 2 = 125
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