Competitive Helper - New Function

I've added small, but useful function to the  https://github.com/lion137/Competitive-Helper . It computes, within the range, any, well, lots of number series, like a Harmonic series or so. Works only on floats, but this is just a helper, basically to sanity check the work. Usage in the readme. A small example, also, here:

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def factorial(n): if n == 0: return 1 s = 1 while n > 0: s *= n n -= 1 return s print(reduce_series(add, lambda n: n / (factorial(n)), 0, 7))

Supplying add as an operator and n / n! function from 0 to, let's say, seven, we have a Euler number.
Enjoy!