This is using Python can you please explain to me in detail this is for study guide

3. Create a .txt file with the following contents:

HelloWorldHelloWorldHelloWorldHelloWorld

GoodnightMoonGoodnightMoonGoodnightMoon

HelloWorldHelloWorldHelloWorldHelloWorld

GoodnightMoonGoodnightMoonGoodnightMoon

Write a program that accepts a file name is an input, opens said file, and processes

input. You will write the results to an output file. For processing, count the number

of upper case letters on each line and write that number to the output file along with

the line number that is associated with that number, i.e.:

Line #2 has 6 uppercase letters.