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Mike Driscoll

@driscollis

29 Dec 21

The primary method for adding items to a #Python list is by using its `append()` method.

The `append()` method is useful for adding one item at a time!

🧵🐍🔥

One #Python list gotcha to watch out for it appending a list to another list.

It may not work the way you want it to!

In this case, it adds the entire list as an element in your original list. In other words, you now have a nested list!

If you want to add the items in a Python list to another list, you should use the `extend()` method

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Mike Driscoll

@driscollis

16 Dec 21

Today I want to talk about generators in #Python!

🧵🐍👇

Python functions will always return one value

Python generators can return one OR more values!

A generator works by "saving" where it last left off (or yielding) and giving the calling function a value.

A generator function requires Python's yield statement

To create a generator in #Python, you must use the `yield` keyword.

Here's an example that can generate an infinite number of return values:

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Mike Driscoll

@driscollis

14 Dec 21

Iterators in #Python are usually defined as needing the following two methods:

🐍 __iter__ - provides iteration support
🐍 __next__ - returns the next item in the container

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A #Python list isn't considered an iterator. It is an iterable, something that you iterate over. But because lists don't define `__next__`, they aren't technically an iterator.

However, you can turn a list into an iterator using the built-in `iter()` function:

You can create your own iterators in #Python by adding the appropriate magic methods to your class.

Here is an example:

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Mike Driscoll

@driscollis

4 Dec 21

A lot of people use #Python for automation. Let's talk about some of the packages you can use this task!

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PyAutoGUI is useful if you need to control the mouse and keyboard on your PC with Python

You can use PyAutoGUI to fill out forms, take screenshots and much more

pyautogui.readthedocs.io/en/latest/

Pywinauto is also for controlling the mouse and keyboard, but is specifically targeted at Windows

pywinauto.readthedocs.io/en/latest/

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Mike Driscoll

@driscollis

3 Dec 21

I wrote a book about creating GUIs with #Python a couple of years ago.

In it, I created a SQLite database viewer application with #wxPython in under 100 lines of code

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Here is the SQLite database viewer I created with #Python and #wxPython for the book

Note: This code should work fine on Windows, Mac and Linux

You can get the code for my SQLite database viewer on GitHub here:

github.com/driscollis/app…

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Mike Driscoll

@driscollis

3 Dec 21

Let's talk about type hinting in #Python

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Type hinting is not enforced by Python. You can enforce it with outside packages, such as Mypy or with your Python IDE

Type hinting is most useful when you have a large team you are working with or with a large codebase.

Type hinting is also useful for introspection when creating Python packages

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