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How to delete items from a dictionary while iterating over it?
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EDIT:
This answer will not work for Python3 and will give a RuntimeError.
RuntimeError: dictionary changed size during iteration.
This happens because mydict.keys() returns an iterator not a list.
As pointed out in comments simply convert mydict.keys() to a list ...
In C#, what happens when you call an extension method on a null object?
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I was referring to the difference between call and callvirt il instructions. In one edit I actually tried to href the two Opcodes pages, but the editor barfed at the links...
– Marc Gravell♦
May 11 '09 at 9:48
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Simplest way to read json from a URL in java
This might be a dumb question but what is the simplest way to read and parse JSON from URL in Java ?
11 Answers
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Is there a way to create multiline comments in Python?
...Python's style guide, PEP8, favors using consecutive single-line comments, and this is also what you'll find in many projects. Text editors usually have a shortcut to do this easily.
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Simpler way to put PDB breakpoints in Python code?
...uestion. I've been a bit spoiled with debuggers in IDEs like Visual Studio and XCode. I find it a bit clumsy to have to type import pdb; pdb.set_trace() to set a breakpoint (I'd rather not import pdb at the top of the file as I might forget and leave it in).
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When someone writes a new programming language, what do they write it IN?
Please excuse my ignorance. I'm dabbling in PHP and getting my feet wet browsing SO, and feel compelled to ask a question that I've been wondering about for years:
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How to drop unique in MySQL?
...0) . To get this to work, drop the foreign key first, then drop the index, and recreate the foreign key afterwards. e.g ALTER TABLE fuinfo DROP foreign key fk_name_for_email;
– Brad Parks
Dec 12 '12 at 20:08
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Determining the last changelist synced to in Perforce
... the server using:
p4 changes -s submitted -m1
then sync to that change and record it in the revision info. The reason is as follows. Although Perforce recommends the following to determine the changelist to which the workspace is synced:
p4 changes -m1 @clientname
they note a few gotchas:
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Get a list of all threads currently running in Java
...de worse for the sake of efficiency. If you have an efficiency requirement and an infrastructure to measure efficiency quantitatively, then I'm ok with people making code worse, because they seem to know what they're doing. See the root of all evil according to Donald Knuth.
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How to permanently disable region-folding in Visual Studio 2008
...f my colleagues love it, but I personally always want to see all the code, and never want code folded out of sight. I'd like a setting that means my copy of Visual Studio never folds #regions or function bodies.
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