# TODO: Put appropriate comments including your name, and a description
# of what the program does at the top of this file.

from zellegraphics import *
from string import *

def get_input_file(window, entry_box, text_message):
    """Waits for a mouse click on the given window.  Gets the input file name 
    from the given text entry box.  Displays messages using the given text 
    message object.  Returns an opened file."""
    # Use a while loop and exception handling to check that
    # the file exists.
    # If file does not exist (IOError should be caught),
    # display appropriate message by calling a mutator method of the 
    # textMessage object.  Continue prompting the user 
    # to enter the name of a file that exists.
    # When the user enters the name of a file that exists, break
    # out of the while loop and return the opened file.
    #-------------------------------------------------------
    # TODO: REPLACE WITH YOUR CODE
    #-------------------------------------------------------
    return in_file


def find_sum_and_count_for_line(line):
    """Finds the sum and count of the numbers in the given line of text."""
    #-------------------------------------------------------
    # TODO: REPLACE WITH YOUR CODE
    #-------------------------------------------------------    

    
def compute_mean_for_file(the_file):
    """Reads numbers from the given file, which must already be open
    for reading, and returns the mean of all the numbers found."""
    # HINT:  This function should call find_sum_and_count_for_line()
    # repeatedly.
    #-------------------------------------------------------
    # TODO: REPLACE WITH YOUR CODE
    #-------------------------------------------------------    
    return mean


def main():
    """Creates the program GUI.  Calls 'helper' methods to open a file given 
    by the user and compute the mean of the numbers in the file.  Displays the
    mean."""
    #-------------------------------------------------------
    # TODO: REPLACE WITH YOUR CODE
    #-------------------------------------------------------    
    # Can use a mouse click event to terminate the program
    # Don't forget to close the window you created and the
    # file that you opened.
    #-------------------------------------------------------    

if __name__ == '__main__':
    main()