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Difference between len() and .__len__()?
...e even more added value beyond simple sanity checks and readability. By uniformly designing all of Python to work via calls to builtins and use of operators, never through calls to magic methods, programmers are spared from the burden of remembering which case is which. (Sometimes an error slips in...
Difference between except: and except Exception as e: in Python
... section of the docs and the Errors and Exceptions section of the tutorial for more info.
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Can “using” with more than one resource cause a resource leak?
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No.
The compiler will generate a separate finally block for each variable.
The spec (§8.13) says:
When a resource-acquisition takes the form of a
local-variable-declaration, it is possible to acquire multiple
resources of a given type. A using statement of the form
usin...
Difference between __str__ and __repr__?
...defaults tend to be fairly useful. However, in this case, having a default for __repr__ which would act like:
return "%s(%r)" % (self.__class__, self.__dict__)
would have been too dangerous (for example, too easy to get into infinite recursion if objects reference each other). So Python cops out....
How do I get the full path to a Perl script that is executing?
...eList; print Module::CoreList->first_release("File::Basename");'; echo. For File::Basename that was Perl 5.0.0, which was released in the late '90s—I think it's save to use by now.
– Drew Stephens
Apr 5 '16 at 12:18
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What is the advantage of GCC's __builtin_expect in if else statements?
...ipeline better, since a jump thrashes the already fetched instructions.
Before the jump is executed, the instructions below it (the bar case) are pushed to the pipeline. Since the foo case is unlikely, jumping too is unlikely, hence thrashing the pipeline is unlikely.
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How to go about formatting 1200 to 1.2k in java
I'd like to format following numbers into the numbers next to them with java:
23 Answers
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How to override the [] operator in Python?
... the name of the method to override the [] operator (subscript notation) for a class in Python?
3 Answers
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Is gcc's __attribute__((packed)) / #pragma pack unsafe?
...n gcc would, I believe, be impractical. A general solution would require, for each attempt to dereference a pointer to any type with non-trivial alignment requirements either (a) proving at compile time that the pointer doesn't point to a misaligned member of a packed struct, or (b) generating bulk...
Python name mangling
...g
def push(self, value):
self.storage.append(value)
This is for sure a controversial way of doing things. Python newbies just hate it and even some old Python guys despise this default - but it is the default anyway, so I really recommend you to follow it, even if you feel uncomfortab...