Want more features on Pastebin? Sign Up, it's FREE!
Guest

Untitled

By: a guest on Jun 28th, 2013  |  syntax: Python  |  size: 2.04 KB  |  views: 73  |  expires: Never
download  |  raw  |  embed  |  report abuse  |  print
Text below is selected. Please press Ctrl+C to copy to your clipboard. (⌘+C on Mac)
  1. def roll(d_str):
  2.     import random
  3.  
  4.     # the following line can be broken into several lines:
  5.     #    num, size = map(int, d_str.split('d'))[:2]
  6.  
  7.     # suppose `d_str` has the value "4d20". After the following line,
  8.     # `roll_fragments` will have the value ["4", "20"]. That is,
  9.     # `roll_fragments` is a list of strings.
  10.     roll_fragments = d_str.split('d')
  11.  
  12.     # We'd like to try to prevent bad input to this function from crashing the
  13.     # program. Assume the function is called with errant input of
  14.     # d_str="4d20d10". We can Choose to use only the first two values from the
  15.     # `split` function in the previous line by using Python's list slicing
  16.     # syntax. The following line, translated to English would read: "set the
  17.     # variable `num_size` equal to the first two elements of the
  18.     # `roll_fragments` list":
  19.     num_size = roll_fragments[:2]
  20.  
  21.     # We ultimately need to determine the integer (int) representation of both
  22.     # of these variables. We can do that with the following:
  23.     num, size = map(int, num_size)
  24.     # In English, the previous line reads: set `num` and `size` to the first
  25.     # and second values (respectively) returned by calling the built-in
  26.     # function `int` for each element in the list `num_size`. Recall that the
  27.     # list num_size will have at most two elements in it.
  28.  
  29.     # To reiterate, the lines:
  30.  
  31.     #   roll_fragments = d_str.split('d')
  32.     #   num_size = roll_fragments[:2]
  33.     #   num, size = map(int, num_size)
  34.  
  35.     # are together equivalent to the single line:
  36.  
  37.     #   num, size = map(int, d_str.split('d'))[:2]
  38.  
  39.     # For more information about list slicing see:
  40.     #    http://stackoverflow.com/a/509295/60366
  41.     # For more information about the `map` and `int` Python built-in functions
  42.     # see:
  43.     #   http://docs.python.org/2/library/functions.html#map
  44.     #   http://docs.python.org/2/library/functions.html#int
  45.  
  46.     face_values = range(1, size+1)
  47.     rolls = [str(random.choice(face_values)) for i in xrange(num)]
  48.     print(' '.join(rolls))
clone this paste RAW Paste Data