How to generate exponentially increasing range in Python

Question

I want to test the performance of some code using an exponentially increasing value. So that as an extra digit is added to the numbers_size the increment is multiplied by 1

Answer 1

OP wrote "Suggestions for improvements without introducing non-standard libraries?"

Just for completeness, here's a recipe for generating exponential ranges - each element is a fixed factor bigger than the previous:

from math import exp
from math import log

def frange(start, stop, numelements):
    """range function for floats"""
    incr = (stop - start) / numelements
    return (start + x * incr for x in range(numelements))

def exprange(start, stop, numelements):
    """exponential range - each element is a fixed factor bigger than the previous"""
    return (exp(x) for x in frange(log(start), log(stop), numelements))

Test:

print(", ".join("%.3f" % x for x in exprange(3,81,6)))

Output:

3.000, 5.196, 9.000, 15.588, 27.000, 46.765