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Mike Driscoll

@driscollis

Feb 12

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

Feb 10

Did you know that #Python has limited support for function overloading? 🐍🔥

You get access to function overloading through `functools.singledispatch`

Here is an example:

You can also register multiple types to the same function when overloading functions in #Python

Here's how:

@mousevspython

You can learn more about using function overloading in #Python in this tutorial of mine @mousevspython

blog.pythonlibrary.org/2016/02/23/pyt…

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Mike Driscoll

@driscollis

Jan 19

One of #Python's most controversial built-in functions is `eval()`. The main reason it is controversial is that it can be used to execute arbitrary code.

#python_builtins_by_driscollis

🧵🐍👇

The arguments for `eval()` are a string and optional globals and locals. If provided, globals must be a dictionary. If provided, locals can be any mapping object.

Here is an example:

You can use `eval()` to evaluate/execute the arbitrary code objects that you get when you run Python's `compile()` function.

The `eval()` built-in is closely related to the `exec()` built-in. `exec()` will take a code block while `eval()` only takes a single expression

Read 4 tweets

Mike Driscoll

@driscollis

Jan 9

Let's talk a little about accessing #Python dictionaries!

Most beginners will access a dictionary like this:

🧵🐍👇

What happens if you try to access a key that doesn't exist in a #Python dictionary?

You'll get a KeyError!

There are several different ways to handle a KeyError. 🐍⚠️

You could wrap it in a `try/except`. Another approach is to use the `get()` dictionary method, like this:

Read 6 tweets

Mike Driscoll

@driscollis

Jan 7

Python includes a built-in callable named `bytearray()`.

The bytearray class is a mutable sequence of integers in the range 0 <= x < 256. They return a new array of bytes

#python_builtins_by_driscollis

🧵🐍👇

A bytearray in #Python takes the following optional arguments:

🐍 source[optional]: Initializes the array of bytes
🐍 encoding[optional]: Encoding of the string
🐍 errors[optional]: Takes action when encoding fails

It is often useful to see an unfamiliar concept in action. Here are two examples of creating a bytearray using different encodings and printing them out

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Mike Driscoll

@driscollis

Jan 7

Starting in Python 3.7, the `breakpoint()` built-in function was added

It is defined in PEP 553 and simplifies adding a breakpoint to your code

#python_builtins_by_driscollis

🧵🐍👇

You can read about the `breakpoint()` function for Python here:

python.org/dev/peps/pep-0…

Here is some sample code showing how to use the `breakpoint()` function in your Python code

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