# Geometric progression

Initializes a list containing the numbers in the specified range where `start`

and `end`

are inclusive and the ratio between two terms is `step`

.

- Use
`range()`

,`math.log()`

and`math.floor()`

and a list comprehension to create a list of the appropriate length, applying the step for each element. - Returns an error if
`step`

equals`1`

. - Omit the second argument,
`start`

, to use a default value of`1`

. - Omit the third argument,
`step`

, to use a default value of`2`

.

from math import floor, log def geometric_progression(end, start=1, step=2): return [start * step ** i for i in range(floor(log(end / start) / log(step)) + 1)] geometric_progression(256) # [1, 2, 4, 8, 16, 32, 64, 128, 256] geometric_progression(256, 3) # [3, 6, 12, 24, 48, 96, 192] geometric_progression(256, 1, 4) # [1, 4, 16, 64, 256]