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#!/usr/bin/env python3
###########################################################################
# script name: ch-1-CORRECTED.py #
# #
# https://github.com/user-person #
# #
# https://perlweeklychallenge.org/blog/perl-weekly-challenge-052/ #
# #
# Stepping Numbers #
# #
# Write a script to accept two numbers between 100 and 999. It should #
# then print all Stepping Numbers between them. #
# #
# A number is called a stepping number if the adjacent digits have a #
# difference of 1. For example, 456 is a stepping number but 129 is not. #
# #
###########################################################################
import os
import re
import sys
step = []
UPPER_LIMIT = 1000
LOWER_LIMIT = 99
for i in range(1,10):
if i < 8: # UP UP
step.append( (i * 100) + ((i+1) * 10) + (i+2) )
if i > 1: # DOWN DOWN
step.append( (i * 100) + ((i-1) * 10) + (i-2) )
if i < 9: # UP DOWN
step.append( (i * 100) + (i+1) * 10 + i )
step.append( (i * 100) + (i-1) * 10 + i ) # DOWN UP
step.sort()
errorString = os.path.basename(sys.argv[0]) + ' requires 2 arguments between 100 and 999.'
if len(sys.argv) != 3:
print(errorString)
exit(1)
args = [int(arg) for arg in sys.argv[1:]]
for arg in args:
if arg < LOWER_LIMIT or arg > UPPER_LIMIT:
print(errorString)
exit(1)
max = min = 0
if args[0] < args[1]:
min = args[0]
max = args[1]
elif args[1] < args[0]:
min = args[1]
max = args[0]
else:
max = min = args[0]
commaFlag = False
if step[0] > max or step[-1] < min:
exit(0)
for num in step:
if num >= min and num <= max:
if commaFlag:
print(', ', end='')
print(num, end='')
commaFlag = True
elif commaFlag:
break
if commaFlag:
print()
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