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TypeError: method() takes 1 positional argument but 2 were given
... as you can see, does indeed have two arguments - it's just that the first one is implicit, from the point of view of the caller.
This is because most methods do some work with the object they're called on, so there needs to be some way for that object to be referred to inside the method. By conven...
How to list all users in a Linux group?
...ing, you will miss users who have that group as their primary group and anyone who has been added to that group via a mechanism other than UNIX flat files (i.e. LDAP, NIS, pam-pgsql, etc.).
If I absolutely had to do this myself, I'd probably do it in reverse: use id to get the groups of every user ...
Different types of thread-safe Sets in Java
...y. This means that no two methods of the set can be executed concurrently (one will block until the other finishes) - this is thread-safe, but you will not have concurrency if multiple threads are really using the set. If you use the iterator, you usually still need to synchronize externally to avoi...
Force overwrite of local file with what's in origin repo?
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If you want to overwrite only one file:
git fetch
git checkout origin/master <filepath>
If you want to overwrite all changed files:
git fetch
git reset --hard origin/master
(This assumes that you're working on master locally and you want the c...
Why does Ruby have both private and protected methods?
...e ignored by default by RDoc when generating documentation while protected ones are not. You can always use the --all flag to include them.
– jasoares
Mar 7 '14 at 1:01
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What is the most efficient Java Collections library? [closed]
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@Andreas: Can't say I agree. Not that it's a "one or the other" scenario - I use the regular collections (with helpers like the Lists class) and then use Iterables etc when I need to. Use the complexity only when it helps you.
– Jon Skeet
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How do I add a path to PYTHONPATH in virtualenv
...h, so if you're developing it doesn't work.
– Erik Aronesty
Aug 29 '18 at 21:34
Also, if you know the absolute path, w...
Check a radio button with javascript
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everyone is getting the element by ID I have more than one radio buttons with the same name. and I think that's what most people need to select a group of radios by name and then based on value check one of them.
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Convert array to JSON
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for anyone still reading this answer, it's worth pointing out that all modern browsers include the JSON object as standard, which means that you don't need this script unless you're planning to support older browsers like IE7 or Fir...
When would you use delegates in C#? [closed]
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Delegates are very useful for many purposes.
One such purpose is to use them for filtering sequences of data. In this instance you would use a predicate delegate which accepts one argument and returns true or false depending on the implementation of the delegate itself...