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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.
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December 4th, 2020 Creator 1 First Name
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Our last presentation on classes reviews the issue of typing, and why this has become much trickier with the introduction of subclasses. This is the last material covered in the second exam.The…
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November 12th, 2020 Creator 1 First Name
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In this video we show one of the most powerful while-loop techniques: computing to convergence. Convergence is a concept that most students learn in Calculus, and so we will use a little Calculus in…
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November 12th, 2020 Creator 1 First Name
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When we were recording the video on custom error types, it ran quite long. So we decided to break it up into a second video. In this video we look at a slightly more complicated error type. We also…
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November 12th, 2020 Creator 1 First Name
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Now that we can raise an error of any type, it is time to make our own error types. In this video we show that this is incredibly simple, and needs almost no code.
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November 12th, 2020 Creator 1 First Name
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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…
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November 12th, 2020 Creator 1 First Name
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After the last video, try-except looks less like an if-else statement and more like an if-elif-else statement. As we see in this video, this has profound effects on how errors interact with the call…
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November 12th, 2020 Creator 1 First Name
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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.
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November 12th, 2020 Creator 1 First Name
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In this video we revisit error messages in Python and show how to read the error type. This type is a class, which means that you can construct your own error objects.
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November 12th, 2020 Creator 1 First Name
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Whenever we have enforced preconditions, we have always used the type function. In this video we show why that is a problem, particularly when we want to use an object argument that is a subclass of…
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November 12th, 2020 Creator 1 First Name
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We have long said that the dot (.) in Python means “inside of the folder”. But which folder? In this video, we show why subclasses makes this question a little less clear. When Python…
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November 7th, 2020 Creator 1 First Name
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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,…
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October 29th, 2020 Creator 1 First Name
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We have seen the None value used in several previous videos. But in this video we finally introduce it formally. In particular, we show why it is so commonly used in object initialization.
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October 27th, 2020 Creator 1 First Name
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In addition to attributes, objects also have methods. In this video, we show how to add a method definition to a class. For the most part, it is as simple as indenting a function definition inside of…
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October 27th, 2020 Creator 1 First Name
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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…
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October 27th, 2020 Creator 1 First Name
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Dictionaries are mutable. In this video we show how to alter there contents. This includes reassigning the value of a dictionary for a given key. But it also includes adding and deleting keys.
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October 27th, 2020 Creator 1 First Name
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