# Compute the number of words, lines and characters in a file.  The results
# will be saved in a new file.  Both file names will be command line parameters.
import sys

# Check the command line parameters and open the files
if len(sys.argv) != 3:
  print("You must start this program with 2 command line parameters.")
  print("")
  print(sys.argv[0], "<inputfile> <outputfile>")
  quit()

inf = open(sys.argv[1], "r")
outf = open(sys.argv[2], "w")

# Count the words, lines and characters in the input file
num_lines = 0
num_chars = 0
num_words = 0

line = inf.readline()
while line != "":
  num_lines = num_lines + 1
  num_chars = num_chars + len(line)
  # Use split to generate a list of words, then compute the length of the
  # list to get the number of words
  num_words = num_words + len(line.split())

  # Read the next line from the file
  line = inf.readline()

# Save the number of words, lines and characters in the output file
outf.write("Lines: " + str(num_lines) + "\n")
outf.write("Words: " + str(num_words) + "\n")
outf.write("Chars: " + str(num_chars) + "\n")

# Close the files
inf.close()
outf.close()