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python design patterns [closed]
...sentation."
return "<Null>"
def __str__(self):
"Convert to a string and return it."
return "Null"
With this, if you do Null("any", "params", "you", "want").attribute_that_doesnt_exists() it won't explode, but just silently become the equivalent of pass.
Normally...
Removing empty lines in Notepad++
...comment below. Also, if your file is saved with Unix line endings, you can convert it to Windows line endings in Edit > EOL Conversion > Windows Format before doing the find and replace.
– Big McLargeHuge
Aug 16 '12 at 15:51
...
What are rvalues, lvalues, xvalues, glvalues, and prvalues?
... began with the move semantics. Once we have expressions that can be moved and not copied, suddenly easy to grasp rules demanded distinction between expressions that can be moved, and in which direction.
From what I guess based on the draft, the r/l value distinction stays the same, only in the con...
Understanding slice notation
...t value that is not in the selected slice. So, the difference between stop and start is the number of elements selected (if step is 1, the default).
The other feature is that start or stop may be a negative number, which means it counts from the end of the array instead of the beginning. So:
a[-1]...
How does one make an optional closure in swift?
...
@Cezar Could you please explain a bit why and where to use "Optional closure", I am curious to know this.
– iLearner
Apr 6 '19 at 14:17
...
Cannot delete directory with Directory.Delete(path, true)
...he workings of Directory.Delete. Please read the comments for this answer, and other answers to this question.
I ran into this problem before.
The root of the problem is that this function does not delete files that are within the directory structure. So what you'll need to do is create a functi...
subtract two times in python
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It is possible to convert the timedelta object back to datetime ? I mean we have difference_delta .seconds(), is there any way to get back a datetime or time object ? Thx
– dejdej
Dec 11 '18 at 10:28
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Stack, Static, and Heap in C++
...ese three concepts. When do I have to use dynamic allocation (in the heap) and what's its real advantage? What are the problems of static and stack? Could I write an entire application without allocating variables in the heap?
...
Difference between & and && in Java? [duplicate]
I was just wondering what the difference between & and && is?
A few days I wrote a condition for an if statement the looked something like:
...
How can I selectively escape percent (%) in Python strings?
...of the second table in that section, it states:
'%' No argument is converted, results in a '%' character in the result.
Therefore you should use:
selectiveEscape = "Print percent %% in sentence and not %s" % (test, )
(please note the expicit change to tuple as argument to %)
Without kn...