CONTEXT MANAGERS In Python Are GENIUS!

What are context managers in Python? How can they give us more flexibility in our code? Let's find out together in this lesson!
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[@sdmagic]

Really useful stuff. Thank you! I immediately implemented it in my database class.

[@ntlake]

You can also use the @contextmanager decorator:
from contextlib import contextmanager
class File:
def __init__(self, path: str, mode: str):
self.path = path
self.mode = mode
self.is_open = True
def do_something(self):
if self.is_open:
print(f"Hi! This is a file. Its path is '{self.path}' and its mode is '{self.mode}'")
return
raise ValueError("this file is closed")
def close(self):
self.is_open = False
@contextmanager
def open_file(path: str, mode: str = "r"):
file = File(path, mode)
yield file
file.close()
with open_file(r"myfile.txt") as f:
f.do_something()

[@enesguler6034]

I think it is a perfect feature. It may be useful for opening a video in OpenCV. Because I generally forget to close the video stream.

[@wiseskeshom4673]

Thank you so much for this informative stuff.

[@davigalilei9749]

Greatly explained.

[@daviddanielng]

Thanks, i have been thinking about writing my own context manager, but don't have the time to check the docs.
Thanks.

[@castlecodersltd]

A good explanation, thank you

[@grzegorzryznar5101]

In a most cases it is easier to achieve with contextmanager decorator from contextlib:
@contextmanager
def open(name: str):
print(f'opening file: {name!r}')
yield 'return value'
print(f('closing file: {name!r}') # exit block

[@martinking4615]

You are the man!!

[@mufasaruleroftheanimalking1026]

That‘s another way of wrapping

[@ConstantlyDamaged]

Any chance of an extra one on this showing operation of "async with"?

[@rantalbott6963]

What gets called if you just fall out of the with block without an exception? Is there a "__else__" to make it consistent with loops? 😆

[@wellygeek]

How do you implement __ENTER__ and __EXIT__ at the method level not class level?

[@landsgevaer]

❓
As a static class method? You don't.

[@tamirshalev9019]

Thanks for the explanation! However, 'open' is a function rather than a class, so how does that work actually behins the scenes?

[@Skrattoune]

Obviously it returns an object that has the enter and exit Dunder methods. Probably a FILE object...

[@RedShipsofSpainAgain]

2:04 how did you get that entire line of text to appear automatically? "def __exit__(self, exc_type, exc_val, exc_tb):"
Is it possible to do this in VS Code?

[@dopaminedetox8437]

for me the same, does not show __enter__ and __exit__

[@SunroseStudios]

he's using an IDE.looks like Intellij Idea, maybe? not sure

[@devil_brawl]

Which app are you using

[@Ismail_Dagli]

I guess you mean the IDE he is using? It's PyCharm.

[@malkistdev]

What font do you use?

[@Indently]

I think it's called Jetbrains Mono

[@teksimian]

python programmer can't find curly brackets 😂

[@theangriestcrusader]

i wish we used curlies instead of indentation icl ;_;

[@mayorc]

What's the code editor name?

[@Indently]

PyCharm

[@dcknature]

Thank you so much for explaining context managers in Python 👍!
likes = 63 😉😉

[@santoshkumargouda7795]

Is there a discord channel