summary in this first we have covered large amount of material which should be mostly review but probably covered some things that are new to you as well don' be too overwhelmed by it all the purpose of this is to get you asking questions about the things you don' understand if you don' understand somethingyou should ask your teacher or someone who knows more about programming in python they can likely help you asking questions is great way to learn and computer science is all about lifetime of learning here is list of the important concepts you should have learned in this you shouldknow how to create an objectboth from literal value and by calling the object' constructor explicitly understand the concept of reference pointing at value ( an objectin python know how to call method on an object know how to import module understand the importance of indentation in python programs know why you write main function in python programs and how to call the main function know how to read records from file whether they be multi-linesingle linefixed lengthor variable length records know how to define container class like pylist defined in this understand the concept of polymorphism and how that means an object will do the right thing when method is called understand the accumulator pattern and how to use it in program know how to implement simple gui using tkinter in python entry boxeslabelsbuttonsframesand event handlers should all be concepts that are understood and can be programmed by looking back at the examples in this and finally you should know how to read and write xml files in your programs there is lot of example code in this and the final version of the draw program is provided on the text' website or in sect while it is doubtful you will be able to memorize each line of the code you found in this you should make sure you know how things work when you look at it and you should remember that you can use this as resource come back to it often when you need to see how to do something in later using this example code as reference will help to answer lot of your questions in future this copy belongs to 'acha