Aspect Ratio Calculator | Python Fiddle

import os

# check os and set value for clear_cmd 
if os.name == 'nt': clear_cmd = 'cls'
else: clear_cmd = 'clear'

# Clear screen
os.system(clear_cmd)

test_width = []
frames = []

# Get user input
print 'Please enter an aspect ratio to test.'
ratio_width = int(raw_input('Enter ratio width (ie. 16): ')) 
ratio_height = int(raw_input('Enter ratio height (ie. 9): ')) 
print
print 'Will find all whole number ratios that are ',ratio_width,':',ratio_height
width_min = int(raw_input('From frame width: '))
width_max = int(raw_input('Up to frame width: '))
print

# calculate possible widths
for i in range(width_min,(width_max+1)):
  if i % ratio_width == 0:
    test_width.append(i)
  else: 
    pass
        
# test if height of possible widths is also divisible by 16 and create tuple list
for i in range(len(test_width)):
  width = test_width[i]
  height = (test_width[i]/ratio_width)*ratio_height 
  
  if height % ratio_height == 0:
    tuple = (width, height)
    frames.append(tuple)

for i in frames:
  print i

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