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Mike Driscoll

@driscollis

Feb 18

Today we are going to talk a little about creating command-line applications using #Python and its built-in `argparse` package!

🧵🐍👇

In this example of using `argparse`, you don't even create any custom arguments! You just create an ArgumentParser argument and call `print_help()`!

You can see in this example that `argparse` already provides useful information to your users without adding any arguments!

Normally when you create an `ArgumentParser` object, you would do so in a function and return the object.

Let's rewrite the previous example to follow that coding pattern:

Read 11 tweets

Mike Driscoll

@driscollis

Feb 17

Even if you are a beginner, you have probably used #Python's built-in `print()` function.

But let's take a few minutes to talk about the humble `print()` function and see what you might have missed!

#python_builtins_by_driscollis

🧵🐍👇

The `print()` function takes the following arguments:

🐍 *objects - Stuff to print
🐍 sep=' ' - A string to separate object
🐍 end='\n' - A string to end on
🐍 file=sys.stdout - Where to write the data
🐍 flush=False - Whether or not to force flush the stream

Let's look at some examples of using Python's `print()` function:

Read 5 tweets

Mike Driscoll

@driscollis

Feb 17

#Python has an awesome library called `collections`! One of my favorite tools from that library is the `Counter` class.

Here I use `Counter` to find the most common occurrences of a value in a list:

Let's use `collections.Counter()` to count letters in a string!

Note that the object that is returned by the Counter class can be accessed like a dictionary!

Python's `collections.Counter()` class has special methods that you can use to `subtract()` items from the counter object.

Here's an example:

Read 4 tweets

Mike Driscoll

@driscollis

Feb 16

If you want to use #Python to read and write text or binary files, then you'll need to familiarize yourself with the built-in `open()` function!

Join me for this thread to learn more!

#python_builtins_by_driscollis

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#Python's `open()` function actually has quite a few different parameters that you can use:

The most commonly used parameters you will use with #Python's `open()` function are:

🐍 file - The path to the file
🐍 mode - Read, write, binary, etc
🐍 encoding - What encoding the file is in

Read 8 tweets

Mike Driscoll

@driscollis

Feb 16

We have already learned about the `bin()` and `hex()` functions. Today you will learn about #Python's handy `oct()` function!

`oct()` is used to convert an integer number to an octal string prefixed with “0o”

#python_builtins_by_driscollis

🧵🐍👇

Here are a couple of examples of using the `oct()` function with positive and negative numbers:

The #Python documentation has a nice example that shows how to format octal numbers using string formatting:

Read 4 tweets

Mike Driscoll

@driscollis

Feb 15

Blockchain is a super popular topic here on Twitter. While I am not a blockchain developer, I thought it would be fun to put together a short thread on blockchain and #Python

Check it out if you're interested in this topic!

🧵🐍👇

@ActiveState

ActiveState is a well-respected #Python company with lots of great content and they have an intro article on blockchain with Python:

activestate.com/blog/how-to-bu… @ActiveState

@ActiveState

@ActiveState The GeekFlare website also has a popular article on creating a blockchain with #Python:

geekflare.com/create-a-block…

Read 7 tweets

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