#
# This program finds the average of all numbers in an input file
# !!! We assume that all numbers are typed into a file one by one
#

def main():
    print "This program finds the average of all numbers in a given file."
    print "Numbers should be entered into a file one per line."

    fname=raw_input("Please, input the file name, where the numbers are stored:")

    # If the file with the supplied name cannot be found, the program just prints the warning message and stops
    try: 
        inp=open(fname,'r')

        sum, counter=0,0
        for line in inp:
            sum=sum+eval(line)
            counter=counter+1

        average=float(sum)/counter
        print "The average of all numbers from the file %s is %f" % (fname,average)

    except IOError:
        print "Can't find the file %s" % fname

main()