Python script to calculate chain reactions

mine_exploder.py

import os.path

def within_blast_radius(x1, y1, blast_radius, x2, y2):
  # Note that this counts points on the edge of the radius which is incorrect
  # Proper way would be to exclude them as they are not in the radius (replace <= with <)
  return ((x1 - x2) ** 2 + (y1 - y2) ** 2) <= (blast_radius ** 2)

def explode_mine(mines, mine, exploded):
  """Recursive explosion calculation

    Args:
        mines: List of all mines (their data).
        mine: Mine for which we are detecting number of explosions.
        exploded: List containing already exploded mines (to prevent same mine being added more than once - infinite loops)

    Returns:
        Number of exploded mines caused by this mine detonation
  """
  destroyed = 0
  # Iterate trough all mines, skip currently exploding one and the mines that already exploded
  for rest in mines:
    if rest != mine and not rest in exploded:
      if within_blast_radius(*mine, x2=rest[0], y2=rest[1]):
        exploded.append(rest)
        destroyed += 1
        destroyed += explode_mine(mines, rest, exploded)
  return destroyed

if __name__ == '__main__':
    from sys import argv
    if len(argv) < 2:
      print 'Please, provide path to mines file'
    else:
      # Verify that mines file exists
      if os.path.isfile(argv[1]):
        # Read mines file and parse it's contents into a list of integers
        mines = [map(int, line.strip().split()) for line in open(argv[1], 'r')]
        result = []
        # Detect number of explosions for all mines and store result
        for mine in mines:
          result.append(explode_mine(mines, mine, [mine]))
        # Get max number in the list of explosions
        maxExploded = max(result)
        # Get indexes of maxExploded value (taking in consideration that we can have more than one index)
        indexesOfMax = [i for i, j in enumerate(result) if j == maxExploded]
        # Pretty print the result
        print ('Max exploded mines: %s \nMines with maximum explosion: %s' %
          (maxExploded, ','.join(map(str, [x+1 for x in indexesOfMax]))))
      else:
        print ('File %s doesn\'t exists' % argv[1])