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Why is try {…} finally {…} good; try {…} catch{} bad?
...exception within their scope. Anything else should be passed along for someone else to handle. If I have an application that gets a file name from users then reads the file, and my file reader gets an exception opening the file, it should pass them up (or consume the exception and throw a new one) s...
How do you serialize a model instance in Django?
...is your model instance
dict_obj = model_to_dict( obj )
You now just need one straight json.dumps call to serialize it to json:
import json
serialized = json.dumps(dict_obj)
That's it! :)
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Delete commits from a branch in Git
...asked for an already made commit. If you reset --hard, and check the log --oneline --all, the commits still remain in the tree. How do we delete these commits from tree? Thanks.
– iGbanam
Mar 17 '13 at 3:09
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Finding last occurrence of substring in string, replacing that
...ings in the same format, and I want to find the last "." character in each one, and replace it with ". - ". I've tried using rfind, but I can't seem to utilize it properly to do this.
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Why does Python pep-8 strongly recommend spaces over tabs for indentation?
...version scripts, etc.), there is a clear way to end all discussion: choose one.
Guido was the one to choose. He didn't even have to give a reason, but he still did by referring to empirical data.
For all other purposes you can either take this PEP as a recommendation, or you can ignore it -- your ...
Is “IF” expensive?
...itional branch is only taken if a certain condition holds (such as whether one number equals another); if the branch is not taken, control proceeds to the next instruction after the branch like normal. For unconditional branches, the branch is always taken. Conditional branches show up in if state...
Create directory if it does not exist
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This one is not the easiest one, but is a easy one for understanding.
– Wang Jijun
Mar 28 '18 at 21:57
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Can I squash commits in Mercurial?
I have a pair of commits that should really be just one. If I was using git, I would use:
8 Answers
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How do I clone a generic List in Java?
...ist<String> that I'd like to return a copy of. ArrayList has a clone method which has the following signature:
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Mapping two integers to one, in a unique and deterministic way
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Cantor pairing function is really one of the better ones out there considering its simple, fast and space efficient, but there is something even better published at Wolfram by Matthew Szudzik, here. The limitation of Cantor pairing function (relatively) is th...