Python Screencasts - Python Morsels
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Screencast Topics
13 mins
Tuple Unpacking
It's tempting to reach for indexes when working with tuples, lists, and other sequences, but if we know the shape of the tuple we're working with, we can unpack it instead.
Tuple unpacking (aka "multiple assignment" or "iterable unpacking") is often underutilized by new Python programmers.
34 mins
Modules
Modules are the tool we use for breaking up our code into multiple files in Python.
When you write a .py file, you're making a Python module.
You can import your own modules, modules included in the Python standard library, or modules in third-party packages.
10 mins
Command-Line Programs
A .py file can be used as a module or as a "script" which is run from your operating system's command-line/terminal. Python is a great programming language for making command-line scripts.
15 mins
Variable Scope
Python has 4 scopes: local, enclosing, global, and built-ins. Python's "global" variables are only global to the module they're in. The only truly universal variables are the built-ins.
19 mins
Generator Expressions
List comprehensions make new lists. Generator expressions make new generator objects. Generators are iterators, which are lazy single-use iterables. Unlike lists, generators aren't data structures. Instead they do work as you loop over them.
12 mins
Properties
We don't use getter and setter methods in Python. Instead we make properties.
Properties allow us to customize what happens when you access an attribute and what happens when you assign to an attribute.
16 mins
Generator Functions
Generator functions look like regular functions but they have one or more yield statements within them. Unlike regular functions, the code within a generator function isn't run when you call it! Calling a generator function returns a generator object, which is a lazy iterable.
11 mins
Installing Python Packages
Python's standard library includes a lot of helpful modules. But often Python code depends on third-party packages. What are the best practices when working with third party packages in Python?
10 mins
Inheritance
Classes can inherit functionality from other classes in Python. Class inheritance can be helpful, but it can also be very complex.
48 mins
Decorators
Decorators are functions that accept functions and return functions. They're weird but powerful.
68 mins
Classes
Classes are a way to bundle functionality and state together.
The terms "type" and "class" are interchangeable: list, dict, tuple, int, str, set, and bool are all classes.
You'll certainly use quite a few classes in Python (remember types are classes) but you may not need to create your own often.
40 mins
Looping
Unlike, JavaScript, C, Java, and many other programming languages we don't have traditional C-style for loops.
Our for loops in Python don't have indexes.
This small distinction makes for some big differences in the way we loop in Python.
24 mins
Comprehensions
In Python it's very common to build up new lists while looping over old lists. Partly this is because we don't mutate lists very often while looping over them.
Because we build up new lists from old ones so often, Python has a special syntax to help us with this very common operation: list comprehensions.
45 mins
Dunder Methods
You can overload many operators, protocols, and bits of functionality on your Python objects by implementing dunder methods.
41 mins
Assignment and Mutation
Python's variables aren't buckets that contain things; they're pointers that reference objects.
The way Python's variables work can often confuse folks new to Python, both new programmers and folks moving from other languages like C++ or Java.
13 mins
Context Managers
A context manager as an object that can be used with Python's with blocks. You can make your own context manager by implementing a __enter__ method and a __exit__ method.
27 mins
Conditionals
Conditionals statements (if statements) are useful for making a branch in our Python code. If a particular condition is met, we run one block of code, and if not then we run another block.
28 mins
Exceptions
Exceptions happens! When exceptions happen, how should interpret the traceback for an exception? And how, when, and where should you catch exceptions?
62 mins
Data Structures
These screencasts are all about Python's core structures: lists, tuples, sets, and dictionaries.
51 mins
Functions
Python, like many programming languages, has functions. A function is a block of code you can call to run that code.
Python's functions have a lot of "wait I didn't know that" features. Functions can define default argument values, functions can be called with keyword arguments, and functions can be written to accept any number of arguments.
54 mins
Files
Reading from and writing to text files (and sometimes binary files) is an important skill for most Python programmers.
54 mins
Strings
Regardless of what you're doing in Python, you almost certainly use strings all the time. A string is usually the default tool we reach for when we don't have a more specific way to represent our data.
65 mins
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My name is Trey Hunner. I do corporate Python training for teams and I teach Python online through Python Morsels.
In Python Morsels, I publish a new Python screencast every week.
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