# Compute the sum of all of the numbers in a file.  Each number will appear 
# on its own line.
import sys

# Retrieve the file name from the command line
if len(sys.argv) == 2:
  filename = sys.argv[1]
else:
  # Read the file name from the user
  filename = input("Enter the name of a file containing some numbers: ")

# Open the file
inf = open(filename, "r")

# Read the first line from the file and initialize total
line = inf.readline()
total = 0

# Keep looping until we reach the end of the file
while line != "":
  # Remove the newline character from the end of the line
  line = line.rstrip()  

  # Display the number we are about to add to the total and then add it
  print("About to add", line, "into the total...")
  total = total + float(line)

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

# Close the file
inf.close()

# Display the total
print("The total of all the number is", total)