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Walkthrough of Year End Closing and Reporting, Year End Checklist, Use of Screen IDs for Searching, Extending Columns for Descriptions, Navigating Searches, and Voiding Deposits, Payments and…

While generators are coroutines, the communication only goes one way: from the child to the calling parent. In this video we show how to reverse this communication, passing down information from the…

Now that we know how generators work, it is time to write our own. In this video we show how easy it is. We just take out experience with the accumulator pattern and replace the accumulator with a…

Generators look like normal functions, but they do not behave like them. In this video we show how to visualize them, using the Python Tutor.

Making iterator classes is hard. In this video, we show an alternative, allowing us to write the iterator as a ‘function”. This requires the addition of a new python statement, the yield…

In this video we talk about the while-loop and explain why it is necessary. In particular, there are types of iteration that are not possible with the for-loop.

Up until now, the only way that we knew how to create an error is with an assert statement. But these always create errors with the type AssertionError. In this video we show how to create errors…

In this video we show how to use the error type to give you more control over a try-except statement. You can chose to recover from some errors, while completely ignoring other errors.

In this video, we show that we can solve the problem of strict typing by using the isinstance function. This function will be our preferred way for enforcing preconditions going forward.

Getters and setters have another advantage in that they allow us to completely disable to any changes to an attribute. This allows us to separate attributes into mutable and immutable attributes,…

Unlike other programming languages, a Python class has only one constructor, If we want to give the user more flexibility when creating objects, we should make certain arguments optional. In this…

Methods definitions look just like function definitions, but we call them differently. In this video we show how to visualize a method call, and we see just how it differs from a function call.

The primary role of an object is to store attribute variables. In this video we demonstrate the easiest way to add attributes to an object. We see that we can also add attributes to class folders as…