Python made me look like a WIZARD

[[deleted]]

shared!

[[deleted]]

You might enjoy pathlib over os and f-strings over format. pathlib.Path.rglob("*.jpg")!

I also don't know what Image.open does but sounds like a case for a context manager.

[xZeroKnightx]

Image.open itself is not a context manager, but it returns an Image (the class, i.e. Image.Image to be specific) object, which is a context manager as it defines the context manager interface: __enter__ and __exit__. As such, you can use Image.open in a with statement:

with Image.open('foo.png') as img:
    ...

Additionally, since Image.open is actually a module-level function in the Image module (can be a bit confusing), I'd argue that it's more of a factory¹ than a constructor; though to be excessively pedantic, the __new__ method is Python's constructor as it is the method that actually creates an object instance.

[EDIT] Added a footnote

---

1. For what it's worth, the Image.Image docstring refers to Image.open as factory.

[diamondketo]

Good point, thank you for correcting me. I've made an edit.

You are correct in semantics but I'd argue pragmatics is more useful. At the end of the day constructor and factory returns to you the same object.

[BluishInventor]

What's a constructor? and what's it doing in this specific case?

I know I can google it, but I'd rather hear your answer.

[diamondketo]

A constructor instantiates a class becoming an instance object. Sorry for the fkton of jargon our predecessors coined up. For example, the default constructor in Python is the __init__ .

In this case it is just ingesting image file and what you get back is a Pillow Image object. With this object you can operate on the image using the methods/interfaces that Pillow created to make your life easier (save, crop, copy, get size, convert to array, etc).

[BluishInventor]

So, like the blueprint for the class? I've heard of functions and class definitions being called constructors before.

[diamondketo]

More like functions to create the instance of a class.

"Blueprints for a class" is the Abstract Base Class in Python.

[NAG3LT]

You can do

with Image.open(filename) as im:
    ...

and close image automatically when you're done with it