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Mike Driscoll

Feb 15 • 7 tweets • 4 min read

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!

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@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…

@ActiveState

@ActiveState codecademy is a super popular site for learning about programming in multiple languages.

They published an interesting article on blockchain and Python too!

codecademy.com/learn/introduc…

@ActiveState

@ActiveState There are also some articles on Medium about using Python and blockchain.

If you have already hit your read limit on Medium, try loading this link in Incognito mode!

medium.com/coinmonks/pyth…

@ActiveState

@ActiveState If you like Udemy, there is a popular course on there about using #Python, cryptocurrency and blockchain

udemy.com/course/build-a…

@ActiveState

@ActiveState Thanks for checking out my thread on blockchain and Python articles.

Let me know if you have any favorite links or courses too!

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More from @driscollis

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!

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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

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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

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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

Python includes a built-in named `object`. This built-in isn't a function. It's actually a class.

The `object` class is the base class of all Python classes. It has methods that are common to all instances of Python classes.

#python_builtins_by_driscollis

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The following two examples show equivalent empty classes in Python.

They both subclass `object`:

You can verify that a class is a subclass of a specific class using Python's built-in `issubclass()`.

Read 4 tweets

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