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What is the most efficient way of finding all the factors of a number in Python?
...st.__add__,
([i, n//i] for i in range(1, int(n**0.5) + 1) if n % i == 0)))
This will return all of the factors, very quickly, of a number n.
Why square root as the upper limit?
sqrt(x) * sqrt(x) = x. So if the two factors are the same, they're both the square root. If you make o...
Why does += behave unexpectedly on lists?
...e general answer is that += tries to call the __iadd__ special method, and if that isn't available it tries to use __add__ instead. So the issue is with the difference between these special methods.
The __iadd__ special method is for an in-place addition, that is it mutates the object that it acts ...
MySQL: determine which database is selected?
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@cwallenpoole how about now?
– Nordle
Oct 23 '18 at 13:00
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show 1 more comment
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Get name of current class?
...rom a child class it will output the child class name. It then gets tricky if you REALLy want the class you're working with.
– Kenet Jervet
Jun 8 '15 at 5:16
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How do I put variables inside javascript strings?
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This is now (2017) the correct answer. Be aware that you will need Babel in your toolchain to support older browsers.
– superluminary
Sep 13 '17 at 8:17
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How to print a int64_t type in C
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And, if using C++ on Linux, be sure to #define __STDC_FORMAT_MACROS before including inttypes.h.
– csl
Nov 28 '14 at 8:50
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Swift native base class or NSObject
...hich extent runtime introspection will be added to the language, I do not know. Method interception will likely become only possible if the method explicitly allows it. This is my guess, but only the language designers within Apple really know where they are really heading.
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Django filter queryset __in for *every* item in list
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This annotation solution seems wrong. What if there are three tags possible (lets call the additional one for t3, and a photo has the tags t2 and t3. Then this photo will still match the given query.
– beruic
Apr 30 '18 at 11:53
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Accessing class variables from a list comprehension in the class definition
...ble. Names are resolved in
the innermost enclosing function scope. If a class definition
occurs in a chain of nested scopes, the resolution process skips
class definitions.
and in the class compound statement documentation:
The class’s suite is then executed in a new exec...
Swift: declare an empty dictionary
...ict = [:] // ok, I'm done with it
In the last example the dictionary is known to have a type Dictionary<String, String> by the first line. Note that you didn't have to specify it explicitly, but it has been inferred.
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