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How to efficiently compare two unordered lists (not sets) in Python?
...
253
O(n): The Counter() method is best (if your objects are hashable):
def compare(s, t):
retu...
Converting between datetime, Timestamp and datetime64
...tetime.utcnow()
>>> dt
datetime.datetime(2012, 12, 4, 19, 51, 25, 362455)
>>> dt64 = np.datetime64(dt)
>>> ts = (dt64 - np.datetime64('1970-01-01T00:00:00Z')) / np.timedelta64(1, 's')
>>> ts
1354650685.3624549
>>> datetime.utcfromtimestamp(ts)
datetime.da...
How to easily map c++ enums to strings
...t; MyMap;
map_init(MyMap)
(eValue1, "A")
(eValue2, "B")
(eValue3, "C")
;
The function template <typename T> map_init(T&) returns a map_init_helper<T>.
map_init_helper<T> stores a T&, and defines the trivial map_init_helper& operator()(typename T::key_type...
Swift Beta performance: sorting arrays
...quicksort_c(l, a + n - l);
}
Both work:
var a_swift:CInt[] = [0,5,2,8,1234,-1,2]
var a_c:CInt[] = [0,5,2,8,1234,-1,2]
quicksort_swift(&a_swift, 0, a_swift.count)
quicksort_c(&a_c, CInt(a_c.count))
// [-1, 0, 2, 2, 5, 8, 1234]
// [-1, 0, 2, 2, 5, 8, 1234]
Both are called in the same pr...
Multiple “order by” in LINQ
...
edited Jan 25 '18 at 14:53
syloc
3,81655 gold badges2828 silver badges4747 bronze badges
answered Nov 1...
How to get number of entries in a Lua table?
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132
You already have the solution in the question -- the only way is to iterate the whole table wit...
Understanding __get__ and __set__ and Python descriptors
...nce?
– Lemma Prism
Mar 12 '19 at 2:43
2
'instance' can be instance of any class, self will be ins...
Schema for a multilanguage database
...make a decision on this for our next application.
So far we have used your 3rd type.
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How to wait for several Futures?
... as follows instead:
val fut1 = Future{...}
val fut2 = Future{...}
val fut3 = Future{...}
val aggFut = for{
f1Result <- fut1
f2Result <- fut2
f3Result <- fut3
} yield (f1Result, f2Result, f3Result)
In this example, futures 1, 2 and 3 are kicked off in parallel. Then, in the for c...