How to Count the Number of Lines of an Output?

You can pipe the output in to wc. You can use the -l flag to count lines. Run the program normally and use a pipe to redirect to wc.

python Calculate.py | wc -l

Alternatively, you can redirect the output of your program to a file, say calc.out, and run wc on that file.

python Calculate.py > calc.out
wc -l calc.out