Search for tag: "expressions"

Lesson 25.2 Error-Specific Recovery

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.

From  Hannah Lee on November 12th, 2020 33 plays

Lesson 15.2 Complex Tuple Expressions

Tuples are very, very similar to strings. In this video we explore this similarity, showing that they support many of the same operations and methods.

From  Hannah Lee on October 10th, 2020 15 plays

Lesson 9.5 Conditional Expressions

While there are no more conditional statements, Python does support a conditional expression. In this video we introduce an expression that evalues to something different, depending upon the boolean…

From  Hannah Lee on September 24th, 2020 4 plays

Lesson 9.4 If-Elif Statements

In this video we introduce the final conditional statement, the if-elif-else statement. This allows you to chose between an arbitrary number of options.

From  Hannah Lee on September 24th, 2020 5 plays

Lesson 3.1 Built-In Functions

The easiest functions to use in Python are those that are built into it. They are listed on the Python Documentation page. In this video we examine some of these and show the syntax for how to use…

From  Hannah Lee on September 9th, 2020 8 plays

Lesson 2.3 Sequential Execution

Now that we have assignment statements, it is time to move beyond the simple calculator model of Python. As we see in this video, the order in which we type Python commands matters.

From  Hannah Lee on September 7th, 2020 6 plays

Lesson 2.2 Assignment Statements

Now that we have some idea of what a variable is, it is time to start creating them. We do that with assignment statements, which are the subject of this video.

From  Hannah Lee on September 7th, 2020 8 plays

Lesson 2.1 Notion of a Variable

Variables are tricky things because they are often invisible. To better understand them, we need to build a mental model of how they work. That is the purpose of this video.

From  Hannah Lee on September 5th, 2020 7 plays

Lesson 1.4 Boolean Expressions

The third basic type is the bool type. It only has two values: True and False. However, as we shall soon see, this type is one of the most important for computer programming.

From  Hannah Lee on September 4th, 2020 10 plays

Lesson 1.1 Evaluation

Before we get started with Python we need to define some basic terminology. Those math-like formula that we type into Python are called expressions. Python then uses the process of evalation to turn…

From  Hannah Lee on September 4th, 2020 14 plays