Rodrigo πŸπŸš€ Profile picture
Nov 6, 2021 β€’ 11 tweets β€’ 4 min read β€’ Read on X
The Python 🐍 Standard Library is one of the reasons I love πŸ’™ Python.

πŸ“‚πŸ” dealing with your filesystem is super simple.

All you have to do is use the `pathlib` module.

This short thread is a mini `pathlib` cookbook 🍳, showing some example usages of `pathlib`.

Ready πŸš€?
πŸ“‚ Creating a `Path` object

`Path` objects are the bread and butter of `pathlib`.

Here, I just create a path with no arguments, which defaults to the path `.`

Notice how I used `Path` but I get a `WindowsPath` back.

`pathlib` automatically detects your OS πŸ˜‰
πŸ“‚ Getting the parent

The `parent` attribute returns the logical parent of the path you have at hands πŸ‘‡
πŸ“‚ Navigating with `/`

The `/` is the operator for division, right?

But, with paths, you can use it to navigate to other paths πŸ‘‡

(Use `/` regardless of the OS you are on.)
πŸ“‚ Resolving a path

Paths have a `.resolve` method that resolves the path.

This resolves any symlinks, and is the only way to β€œget rid of” the `..` in paths πŸ‘‡
πŸ“‚ Going up the filesystem

If you don't want to write a bunch of `.parent` to go up the filesystem, you can also use `/ ".."` and `.resolve`:
πŸ“‚ Check file/directory existence

With the `.exists` method, you can check if the path points to a resource that exists in the filesystem.

This example πŸ‘‡ should help you figure out what I have on my `C:/tmp` folder.
πŸ“‚ Check for valid directories

This is similar to `.exists`, but only returns `True` for directories that exist.
πŸ“‚ Accessing folder relative to script

Imagine you have this structure:

| - project/
| - data/
| - data1.csv
| - data2.csv
| foo.py

Using `__file__`, you can get to the `data` folder πŸ‘‡

This is independent from the current working dir! πŸ”₯
That's it for this mini cookbook thread!

If you enjoyed, let me know, and I'll write more about `pathlib` in the near future!

If you want to learn more about Python 🐍, follow @mathsppblog.

You won't be disappointed.
Here are some cool things we learned πŸ‘‡

πŸ“‚ Creating a `Path` object
πŸ“‚ Navigating with `/`
πŸ“‚ Check file/directory existence
πŸ“‚ Accessing folder relative to script

See you around πŸ‘‹

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

Here is how to do it right! πŸš€

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But this isn't half of the story! Image
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The Python 🐍 built-in `round` is great. πŸš€

Here are some tips on it. πŸ‘‡ Image
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These are some simple examples: Image
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In that case, `round` will choose the even number.

This means it may round up or down πŸ€ͺ

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Error handling in Python 🐍 made simple. πŸš€

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So, if you know something can raise an error, you can write it inside a `try` statement: Image
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That's when the keyword `except` comes in! Image
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Every Python 🐍 programmer uses the ICPO rule. πŸš€

Even if you don't know what it is.

Let me tell you what the ICPO rule is and what it does πŸ‘‡ Image
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More precisely, it is the ICPO rule that tells Python where to look for attributes and methods in your objects.

This is relevant because everything in Python is an object.
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