#
# 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 = 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:
        inSource = open(fname,'r')

        s, counter = 0,0
        for line in inSource:
            s = s + float(line)
            counter = counter+1

        average=s/counter
        print("The average of all numbers from the file {0:s} is {1:0f}".format(fname,average))

    except FileNotFoundError:
        print("File is not found.")
    except ValueError:
        print("File contains non-numerical values")


main()