hw2.py

#!/usr/bin/python

import csv	# Need csv to read/write csv's
import sys	# Need sys to read/write files
import math	# Need math to do calculations
import time	# Need time to get current date

from datetime import date # Not sure about
today = date.today()	  # Get today's date

print "What is your weight?"
weight = raw_input()

# Open weight.txt for writing / appending to file
k = open('weight.txt', 'a')

# Create writer object from csv of file handler
writer = csv.writer(k)

# Write todays date and weight as CSV to file
writer.writerow( (today, weight) )

# Close the file handler
k.close()

# Now we need to read the file, so we create a file handler and open the file in read more
f = open('weight.txt', 'r')

# Read the lines into a variable
lines = csv.reader(f)

# Need these to keep track of where we are in the for loop
i = 0 # We will add each row's weight to this (e.g. 180 + 180 + ...)
x = 0 # This will keep track of the number of rows - probably another way to do this

# Loop through each row, each row will be stored in the row variable (doesn't have to be called row)
# Alt syntax for levi in lines
# 	print levi[1]
# That would use levi as the row variable
for row in lines:
	#print row[1]
	i = i + int(row[1]) # keep adding up the weights, so we can average it
	x = x + 1 # Keep track of the number of rows there are (1, 2, 3...)

# Close the filehandler
f.close()

# Get an average, sum of weight (i) divided by number of rows (x)
avg = i / x
#print 'total %i' % i
print 'avg %i' % avg #Display the average to the user