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Python list subtraction operation
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Use a list comprehension:
[item for item in x if item not in y]
If you want to use the - infix syntax, you can just do:
class MyList(list):
def __init__(self, *args):
super(MyList, self).__init__(args)
def __sub__(self, other):
return self.__c...
What is an idiomatic way of representing enums in Go?
...return a.C
}
Inside the main package a.Baser is effectively like an enum now.
Only inside the a package you may define new instances.
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Can I set max_retries for requests.request?
...et the max_retries parameter on the HTTPAdapter() class was added, so that now you have to use alternative transport adapters, see above. The monkey-patch approach no longer works, unless you also patch the HTTPAdapter.__init__() defaults (very much not recommended).
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“Unknown class in Interface Builder file” error at runtime
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Despite the "Unknown class MyClass in Interface Builder file." error printed at runtime, this issue has nothing to do with Interface Builder, but rather with the linker, which is not linking a class because no code uses it directly.
When th...
Can I list-initialize a vector of move-only type?
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Now, I guess this should not be left without being mentioned in a comment :) move_only m[] = { move_only(), move_only(), move_only() }; std::vector<move_only> v(std::make_move_iterator(m), std::make_move_iterator(m + 3)...
How to convert a set to a list in python?
...to a list. You can use the newly built list like any normal list in python now.
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Proper way to wait for one function to finish before continuing?
...ne!');
});
}
As per @Janaka Pushpakumara's suggestion, you can now use arrow functions to achieve the same thing. For example:
firstFunction(() => console.log('huzzah, I\'m done!'))
Update: I answered this quite some time ago, and really want to update it. While callbacks are abso...
Manipulate a url string by adding GET parameters
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This approach is good when you know that 'category' parameter is not already in the URL. If the parameter is in a URL already then PHP should take the value of the last occurrence of the parameter in the URL, so the solution of @andrewtweber still works. Ye...
Principal component analysis in Python
...o 90 %, 95 % ...
p.npc: number of principal components,
e.g. 2 if the top 2 eigenvalues are >= `fraction` of the total.
It's ok to change this; methods use the current value.
Methods:
The methods of class PCA transform vectors or arrays of e.g.
20 variables, 2 princip...
Calling constructors in c++ without new
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Both lines are in fact correct but do subtly different things.
The first line creates a new object on the stack by calling a constructor of the format Thing(const char*).
The second one is a bit more complex. It essentially does the following
Create an object of...