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nonlocal keyword in Python 2.m>x m>
...local variable but it seems like this keyword is not available in python 2.m>x m>. How should one access nonlocal variables in closures in these versions of python?
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How to check if a number is a power of 2
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There's a simple trick for this problem:
bool IsPowerOfTwo(ulong m>x m>)
{
return (m>x m> & (m>x m> - 1)) == 0;
}
Note, this function will report true for 0, which is not a power of 2. If you want to em>x m>clude that, here's how:
bool IsPowerOfTwo(ulong m>x m>)
{
return (m>x m> != 0) && ((m>x m> &amp...
Why aren't python nested functions called closures?
... access to a local variable from an enclosing scope that has finished its em>x m>ecution.
def make_printer(msg):
def printer():
print msg
return printer
printer = make_printer('Foo!')
printer()
When make_printer is called, a new frame is put on the stack with the compiled code for the...
When should I mock?
...nit test should test a single codepath through a single method. When the em>x m>ecution of a method passes outside of that method, into another object, and back again, you have a dependency.
When you test that code path with the actual dependency, you are not unit testing; you are integration testing...
Remove empty strings from a list of strings
...ythonic way:
>>> strings = ["first", "", "second"]
>>> [m>x m> for m>x m> in strings if m>x m>]
['first', 'second']
If the list must be modified in-place, because there are other references which must see the updated data, then use a slice assignment:
strings[:] = [m>x m> for m>x m> in strings if m>x m>]
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Elegant way to combine multiple collections of elements?
...rary number of collections, each containing objects of the same type (for em>x m>ample, List<int> foo and List<int> bar ). If these collections were themselves in a collection (e.g., of type List<List<int>> , I could use SelectMany to combine them all into one collection.
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How do I put two increment statements in a C++ 'for' loop?
... operator at all. I checked that in GCC as follows:
int i=0;
int a=5;
int m>x m>=0;
for(i; i<5; m>x m>=i++,a++){
printf("i=%d a=%d m>x m>=%d\n",i,a,m>x m>);
}
I was em>x m>pecting m>x m> to pick up the original value of a, so it should have displayed 5,6,7.. for m>x m>. What I got was this
i=0 a=5 m>x m>=0
i=1 a=6 m>x m>=0
i=2 a=7 ...
How to determine if a point is in a 2D triangle? [closed]
...ou started:
float sign (fPoint p1, fPoint p2, fPoint p3)
{
return (p1.m>x m> - p3.m>x m>) * (p2.y - p3.y) - (p2.m>x m> - p3.m>x m>) * (p1.y - p3.y);
}
bool PointInTriangle (fPoint pt, fPoint v1, fPoint v2, fPoint v3)
{
float d1, d2, d3;
bool has_neg, has_pos;
d1 = sign(pt, v1, v2);
d2 = sign(pt, ...
How to count certain elements in array?
... just to compare it to a value is not elegant.
– Felim>x m> Kling
May 25 '11 at 8:33
2
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Combine two columns of tem>x m>t in pandas dataframe
I have a 20 m>x m> 4000 dataframe in Python using pandas. Two of these columns are named Year and quarter . I'd like to create a variable called period that makes Year = 2000 and quarter= q2 into 2000q2 .
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