Variable step in a for loop

Question

I am trying to loop between 0.01 and 10, but between 0.01 and 0.1 use 0.01 as the step, then between 0.1 and 1.0 use 0.1 as step, and between 1.0 and 10.0 use 1.0 as step.

I have the while loop code written, but want to make it more pythonic.

i = 0.01
while i < 10:
   # do something
   print i
   if i < 0.1:
       i += 0.01
   elif i < 1.0:
       i += 0.1
   else:
       i += 1

This will produce

0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9

Answer 1

A special-purse generator function might be the right way to go. This would effectively separate the boring part (getting the list of numbers right) from the interesting part (the # do something in your example).

def my_range():
    for j in .01, .1, 1.:
        for i in range(1, 10, 1):
            yield i * j

for x in my_range():
    print x

Answer 2

One approach would be to use two loops: one for the order of magnitude, and one for the values from 1 to 9:

for exp in range(-2, 1):
    for i in range(1, 10):
        print("{:.2f}".format(i * 10 ** exp))