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In Python, how do I indicate I'm overriding a method?
In Java, for example, the @Override annotation not only provides compile-time checking of an override but makes for excellent self-documenting code.
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Python decorators in classes
...on an instance and could do anything to the instance variables it wanted before and after ( or even whether or not ) it called "bar". There is no such thing as instance variables when declaring the class. Did you want to do something to the class from within the decorator? I do not think that is ...
Java: parse int value from a char
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@KevinVanRyckegem thank you! I was looking for why - '0' worked...I thought it was some deep magic in how Java interpreted chars or whatever...this truly was a case of me over complicating something...
– scoots
May 21 '18 at 20:3...
Getters \ setters for dummies
...eir silverlight run everywhere, so I have to program everything twice, one for SL and one for rest of the world :)
– Akash Kava
Mar 22 '11 at 16:19
2
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How to get the original value of an attribute in Rails
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Before rails 5.1
Appending _was to your attribute will give you the previous value.
For rails 5.1+
Copied from Lucas Andrade's answer below: https://stackoverflow.com/a/50973808/9359123
Appending _was is deprecated in ra...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...hrowInfo
{
unsigned int attributes;
_PMFN pmfnUnwind;
int (__cdecl*pForwardCompat)(...);
_CatchableTypeArray *pCatachableTypeArray;
} _ThrowInfo;
结构体中重要的成员是_CatchableTypeArray。它包含了程序运行时抛出对象的类新信息(RTTI)。本文中示例非常简单...
Get last result in interactive Python shell
... It only works in the interactive shell, though. Don't rely on it for scripts.
– John Fouhy
Oct 14 '08 at 4:54
7
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Django ManyToMany filter()
... style filters in the many-to-many and many-to-one tests. Here is syntax for your specific problem:
users_in_1zone = User.objects.filter(zones__id=<id1>)
# same thing but using in
users_in_1zone = User.objects.filter(zones__in=[<id1>])
# filtering on a few zones, by id
users_in_zones...
How do I get a list of column names from a psycopg2 cursor?
...rk Lutz:
curs.execute("Select * FROM people LIMIT 0")
colnames = [desc[0] for desc in curs.description]
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Django select only rows with duplicate field values
... .filter(id__count__gt=1)
Literal.objects.filter(name__in=[item['name'] for item in dupes])
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