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Proper way to use **kwargs in Python
...implement that in Python 2.
The idiom is so important that in Python 3 it now has special supporting syntax: every argument after a single * in the def signature is keyword-only, that is, cannot be passed as a positional argument, but only as a named one. So in Python 3 you could code the above as:...
Is it safe to push_back an element from the same vector?
...
I'm upvoting now as this is my recollection as well, but a reference is needed.
– bames53
Sep 13 '13 at 14:55
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Length of generator output [duplicate]
...y Fibonacci numbers as you want by calling next().
If you really need to know the number of items there are, then you can't iterate through them linearly one time anyway, so just use a different data structure such as a regular list.
...
PATH issue with pytest 'ImportError: No module named YadaYadaYada'
...ule path even if a module is in the same folder as the file run. I didn't know that this is considered best practice, so that's a useful bit of information, thanks. I agree with most of pep8, although it is still not perfect.
– Zelphir Kaltstahl
Nov 6 '16 at 19...
How do you query for “is not null” in Mongo?
...: 1 }
{ "_id" : ObjectId("544540f11b5cf91c4893eb99"), "otherField" : 2 }
Now, create the sparse index on imageUrl field:
db.foo.ensureIndex( { "imageUrl": 1 }, { sparse: true } )
{
"createdCollectionAutomatically" : false,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}
...
How to detect if a script is being sourced
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If your Bash version knows about the BASH_SOURCE array variable, try something like:
# man bash | less -p BASH_SOURCE
#[[ ${BASH_VERSINFO[0]} -le 2 ]] && echo 'No BASH_SOURCE array variable' && exit 1
[[ "${BASH_SOURCE[0]}" != "$...
How do you add a Dictionary of items into another Dictionary
...alue(value, forKey:key)
}
}
}
dict1.update(dict2)
// dict1 is now ["a" : "foo", "b" : "bar]
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What are C++ functors and their uses?
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int operator()(int y) const { return x + y; }
private:
int x;
};
// Now you can use it like this:
add_x add42(42); // create an instance of the functor class
int i = add42(8); // and "call" it
assert(i == 50); // and it added 42 to its argument
std::vector<int> in; // assume this conta...
Iterating C++ vector from the end to the beginning
...t purpose. (And yes, incrementing a reverse_interator moves it backward.)
Now, in theory, your method (using begin()/end() & --i) would work, std::vector's iterator being bidirectional, but remember, end() isn't the last element — it's one beyond the last element, so you'd have to decrement f...
From an array of objects, extract value of a property as array
...n for getting the value of a property in an object.
Additionally, _.map() now allows a string to be passed in as the second parameter, which is passed into _.property(). As a result, the following two lines are equivalent to the code sample above from pre-Lodash 4.
var result = _.map(objArray, 'fo...