#!/usr/bin/python

# -----------------------------------------------------------------------------
#  Returns the distribution of alphabetic characters in input file
#
#               (c) 2004 Jason Bittel
# -----------------------------------------------------------------------------

import os
import sys
import string

# -----------------------------------------------------------------------------
class g:
   frequencies = {}
   chars = 0

# -----------------------------------------------------------------------------
def parseFile(infile):
   """
   """
   try:
      input = open(infile)

      for line in input:
         for char in line:
            g.chars += 1
            char = string.upper(char)

            if g.frequencies.has_key(char):
               g.frequencies[char] += 1
            else:
               g.frequencies[char] = 1

      input.close()
   except IOError, err:
      sys.stderr.write("Error: unable to access %s: %s\n" % (infile, err.strerror))
      sys.exit()

# -----------------------------------------------------------------------------
def printFrequencies():
   """
   """
   freq = [(n, c) for c, n in g.frequencies.items()]
   freq.sort()
   freq.reverse()

   for count, char in freq:
      if char.isalpha():
         print "%c (%i %.1f%%)" % (char, count, (float(count) / float(g.chars)) * 100.0)

# =============================================================================
def main():
   """
   """
   if not len(sys.argv) == 2: # Check for command line arguments
      print "Usage: %s [ filename ]\n" % os.path.basename(sys.argv[0])
      sys.exit(0)

   parseFile(sys.argv[1])
   printFrequencies()

if __name__ == "__main__": main()