Tweet

@mousevspython

This Thread may be Removed Anytime!

Twitter may remove this content at anytime! Save it as PDF for later use!

More from @driscollis

Mike Driscoll

@driscollis

Nov 21

One of the harder concepts to learn in #Python are decorators.

So let's take a few moments and learn about them!

🧵🐍👇

It's always good to start with a regular function. Why?

Because you create a decorator using functions!

This function, `doubler()` takes in a number and doubles it. That's it!

But wait! #Python functions are also objects. You can get their `__name__` and their docstring (`__doc__`), if they have one.

You can also get a listing of their other methods with `dir()`

What all this means is that you can pass a function to another function!

Read 11 tweets

Mike Driscoll

@driscollis

Nov 21

Let's talk some more about sets in #Python in more detail!

The first thing to talk about is how to create a set. One way to do so is with curly braces.

Don't confuse this with dictionary creation though!

🧵🐍👇

You can also create a set by using Python's `set()` class, which is built-in.

Here you use `set()` to cast a list to a set! 🐍🔥

Note: Sets remove duplicate!

You can test if an item is in a #Python set by using Python's `in` operator:

Read 15 tweets

Mike Driscoll

@driscollis

Nov 20

Let's talk about "unpacking" lists, tuples, and more with #Python!

The first unpacking example I want to show is how you can use a single asterisk to unpack all these different types!

🐍🔥

You can also use the double-asterisk to unpack dictionaries.

In this example, you unpack a nested dictionary into another dictionary. Note that both dictionaries have the same key.

Since this is executed from left-to-right, you unpack and then overwrite the "x" key with 1

Here's a more complicated example of dictionary unpacking.

You may need to re-read this a few times to fully understand what is going on here.

Read 4 tweets

Mike Driscoll

@driscollis

Nov 15

Today is a great day to talk about one of #Python's most popular SQL ORMs - #SQLAlchemy!

SQLAlchemy is an Object Relational Mapper for Python. That means that it can translate Python code to SQL.

🧵👇🐍

Let's take a look at creating a database with #Python and #SQLAlchemy

You need to create classes that model tables in your database.

Then to create the actual database, you use `Base.metadata.create_all()`

Now let's add some data to our database using #Python and #SQLAlchemy

The following code shows how to add data to both our tables. It also shows how to add multiple rows of data all at once! 🐍🔥

Read 6 tweets

Mike Driscoll

@driscollis

Nov 13

It's the weekend, so now's a great time to talk about #Python and SQLite! 🐍

Python works with SQLite, a file-based database, right out of the box via its built-in `sqlite3` library.

Here's how you could connect to a SQLite database with Python:

When you use the `sqlite3` module in Python, you will be using regular SQL to work with it.

So to create a table, you would do something like this:

The following code shows how to insert one row of data into a table as well as how to insert multiple rows using SQL and sqlite3 in Python 🐍🔥

Read 8 tweets

Mike Driscoll

@driscollis

Nov 7

#Python includes several different ways to sort things. One handy way to sort is to use the built-in `sorted()` function!

Let's learn about that today!

#python_builtins_by_driscollis

🧵🐍👇

The `sorted()` function takes in an iterable and a couple of optional arguments.

In this example, you pass in a Python list and sort it from smallest to largest.

Then you set the optional `reverse` argument to True and sort from largest to smallest! 🐍🔥

The `sorted()` function also takes an optional `key` parameter. This parameter is a function that is used to modify the sorting behavior.

In this example, you use `str.lower()` to sort the words of a sentence. It will compare all the words in lowercase while sorting.

Read 5 tweets

Share this page!

Mike Driscoll

People who liked this thread also liked...

Try unrolling a thread yourself!

More from @driscollis

Mike Driscoll

Mike Driscoll

Mike Driscoll

Mike Driscoll

Mike Driscoll

Mike Driscoll

Did Thread Reader help you today?

Don't want to be a Premium member but still want to support us?

Send Email!