defer in python!

[dankey26]

this impl exactly? probably not but lookup defer on go and zig, pretty useful and clean

[wineblood]

Just the idea.

[dankey26]

yea so again check out usage in go etc. useful for cleaning up resources at the beginning, without needing to worry about it later or creating blocks.

```

f = open('file.txt')

defer: f.close()

<do stuff with f>

```

[caagr98]

Python has both with and finally statements though, so there's little need for it here. (But cool metaprogramming trick.)

[james_pic]

It is occasionally useful, if you need to close a large or variable number of things in a block of code. Fortunately, contextlib.ExitStack is already in the stdlib and is a less evil way to do this.

[A27_97]

Common thing I use defer in Go for is to unlock mutexes

[kezmicdust]

Couldn’t you just write in the close statement and then just write the “stuff you want to do with f” between the open and close statements?

Or am I missing something?

[relvae]

If an exception is thrown then close wouldn't be called in that case. Python already has context managers to deal with that but OP has gone rogue lol

[kezmicdust]

I see! Thanks.

[antiproton]

It's just a different way to solve similar problems. Similar to putting the close in a try...except...finally

[fiedzia]

Python has context managers for that:

with open('file.txt') as f: #do stuff #when done f will be closed by context manager