# read in list of numbers
#
# Matt Bishop, MHI 289I, Winter 2019
#
import sys

# the list of numbers; it's initially empty
numlist = []

#
# first, open the file
# it must be in tthe same directory as the current
# working directory in which this program runs
# exit on error
#
try:
    fhandle = open("numbers.txt", "r")
except Exception as msg:
    print("Can't open file:", msg)
    sys.exit(1)

#
# now loop through, reading a line at a time
#
for line in fhandle:
    # convert the line to a number; leading or trailing
    # blanks ignored, but blanks in the middle is an error
    try:
        x = int(line)
    except:
        print("That's not a number")
    else:
        # it;s a number; add the integer value to the list
        numlist.append(x)

#
# sanity check: print what was read as a list
#
print(numlist)

#
# now add them up!
#
sum = 0
for i in numlist:
    sum += i

#
# print out the sum
#
print("sum is", sum)