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Rodrigo 🐍🚀

@mathsppblog

Sep 28, 2021 • 17 tweets • 7 min read • Read on X

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🤔 If you are learning Python 🐍, I want to do an experiment:

Here's a thread 👇🧵 teaching you conditional expressions.

BUT, I will teach you with NO words 😶

I will only show code snippets and examples.

Check the thread out carefully 🔍 and then give me your feedback!

By the way, if you want to learn something from this thread...

I'm not going to lie, you'll have to focus 🔍.

Also, what's the rationale for this crazy 🤪 thread?

By reading code and examples, you see first-hand how the feature is used and where it comes in handy.

Let's go:

That is it for this thread.

So... How was it? 😂
Did you learn something, or was this thread complete trash 🚮?

Give me your honest feedback!

Just commenting a ✅ or ❌ is enough for me.

(Later today I'll publish this thread again, but with words 🤣.)

@mathsppblog

If you are on a path to mastering Python 🐍, and if you want to keep improving your Python skills, then you will want to follow me – @mathsppblog.

I publish quality content daily that you won't want to miss!

See you around 👋

https://twitter.com/mathsppblog/status/1442995463850971139?s=19

For reference, here is (more or less) the same thread, with words:

https://twitter.com/mathsppblog/status/1442995463850971139?s=19

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Rodrigo 🐍🚀

@mathsppblog

May 9

Hide private information in your Python code.

Suppose you want to print an email...

But you want to create that cool ro*****@mathspp.com effect.

This is pretty easy to achieve in Python!

All you need to do is use an f-string and use the appropriate format specifiers. $Diagram showing how you can use f-strings and their format specification to redact private or sensitive information, like email addresses. The code from the diagram: def redact_email(email): user, _, domain = email.partition("@") return f"{user[:2]:*<{len(user)}}@{domain}" print(redact_email("rodrigo@mathspp.com")) # ro*****@mathspp.com$

👉 the first thing you do is use `str.partition` to grab the email “user” and the domain.

We will redact only the user (but you could also redact the domain with the same process).

The `user[:2]` shows the first two characters.

That's the “ro”.

But how do you get “ro*****”?

👉 use an f-string and the width specifier.

You want to create a field as wide as “rodrigo”:

r o _ _ _ _ _

The length of this field is `len(user)`, so you use `{len(user)}` INSIDE the format spec.

This creates a field with the correct width.

Read 6 tweets

Rodrigo 🐍🚀

@mathsppblog

May 18, 2023

I know `print` is the first Python 🐍 function you learned! 🚀

And yet, you don't know this about `print` 👇

What you know for sure is that `print` will take an object and it will print it on the screen.

That's the basic functionality it provides:

Maybe you don't know that `print` can actually print multiple things!

If you pass multiple arguments, they all get printed:

Read 11 tweets

Rodrigo 🐍🚀

@mathsppblog

May 17, 2023

I'll tell you the story of a person that had the wrong name…

And how to prevent that in Python 🐍 with properties 🚀.

👇

John Doe was a regular guy and when he was born, he was inserted into the government's database of people.

They created a new `Person` and added John's details:

John never liked his name Doe, though.

So Joe decided to change his name to Smith.

And so he did.

He updated his last name, but the government `Person` STILL had the wrong name!

Read 10 tweets

Rodrigo 🐍🚀

@mathsppblog

May 14, 2023

Opening a file to read/write is a common task in Python 🐍.

Here is how to do it right! 🚀

👇

Python has a built-in `open` that takes a file path and opens that file.

Then, you have to specify whether you want to open the file to read, write, or append.

But this isn't half of the story!

The default behaviour is to open the file to read/write text.

This works well with TXT or CSV files, for instance.

If you need to open a file to read its binary contents, you can add a `"b"` to the mode:

Read 6 tweets

Rodrigo 🐍🚀

@mathsppblog

May 13, 2023

The Python 🐍 built-in `round` is great. 🚀

Here are some tips on it. 👇

The purpose of `round` is to… round numbers!

It rounds numbers to the closest integer.

These are some simple examples:

However, if the number ends in `.5`, what is the closest integer?

In that case, `round` will choose the even number.

This means it may round up or down 🤪

(In school, I was taught to round `.5` up… 🤷)

Read 6 tweets

Rodrigo 🐍🚀

@mathsppblog

May 12, 2023

Error handling in Python 🐍 made simple. 🚀

👇

The keyword `try` is used before code that might fail.

So, if you know something can raise an error, you can write it inside a `try` statement:

Now that the code is inside a `try` statement, you need to tell Python what error you want to handle, and how.

That's when the keyword `except` comes in!

Read 7 tweets

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