Python 3

-Asks the user for the name of a file and reads it in.

-Asks the user to enter a series of numbers, and when done enters a period .

-The program should write the numbers entered by the user to a file.

-The program should close the file and then open it again for reading. The program should then read all numbers from

the file, using a while loop and find their average and print the average to the screen.

-Repeat the program, but this time using a for loop for reading.

-Make sure to handle the case where the user immediately enters a . Without entering any numbers, when calculating the average

So I can't even get past the first part and I have re-read chapter 6 but everytime I try to open a file from user input I get an error