Comment by dzderic

A while loop and temporary mutable variables are definitely not the Pythonic way of doing this. More idiomatic:

    $ time python -c 'print sum(xrange(100000000 + 1))'
    5000000050000000
    
    real    0m1.398s
    user    0m1.383s
    sys     0m0.012s

Comparison to baseline:

    $ time (echo -e 'n=0 \ni=0 \nwhile (i <= 100000000): \n  n += i \n  i += 1 \n\nprint(n)\n' | python)
    5000000050000000
    
    real    0m33.140s
    user    0m32.939s
    sys     0m0.023s