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  1. def desc_digit(num):
  2.     num_str = str(num)
  3.     while not len(num_str) == 4:
  4.         num_str = '0' + num_str
  5.     num_list = list(num_str)
  6.     output = ''
  7.     while len(num_list) > 0:
  8.         output += max(num_list)
  9.         num_list.remove(max(num_list))
  10.     return int(output)
  11.  
  12.  
  13. def largest_digit(num):
  14.     num_str = str(num)
  15.     return int(max(list(num_str)))
  16.  
  17.  
  18. def asc_digit(num):
  19.     num_str = str(num)
  20.     while not len(num_str) == 4:
  21.         num_str += '0'
  22.     num_list = list(num_str)
  23.     output = ''
  24.     while len(num_list) > 0:
  25.         output += min(num_list)
  26.         num_list.remove(min(num_list))
  27.     return int(output)
  28.  
  29.  
  30. def kaprekar(num):
  31.     assert len(str(num)) < 5, 'Please enter a number 4 digits or lower.'
  32.     output = str(num) + ' -> '
  33.     count = 0
  34.     while not num == 6174:
  35.         num = desc_digit(num) - asc_digit(num)
  36.         count += 1
  37.     return print(output + str(count))
  38.  
  39.  
  40. input = [6589, 5455, 6174]
  41. for i in input:
  42.     kaprekar(i)
Success #stdin #stdout 0.01s 9992KB
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stdin
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Standard input is empty
stdout
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6589 -> 2
5455 -> 5
6174 -> 0
https://ideone.com/2AX9kS
language:
Python 3 (python  3.12)
created:
8 years ago
visibility:
public

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