大约有 47,000 项符合查询结果（耗时：0.0380秒） [XML]
What are “first class” objects?
...g an intrinsic identity (independent of any given name)
being comparable for equality with other entities
being passable as a parameter to a procedure/function
being returnable as the result of a procedure/function
being constructible at runtime
being printable
being readable
being tra...
Implementing slicing in __getitem__
I am trying to implement slice functionality for a class I am making that creates a vector representation.
5 Answers
...
What does the caret operator (^) in Python do?
... invokes the __xor__() or __rxor__() method of the object as needed, which for integer types does a bitwise exclusive-or.
share
|
improve this answer
|
follow
...
Getting attributes of a class
...nspect module. getmembers and the various tests should be helpful.
EDIT:
For example,
class MyClass(object):
a = '12'
b = '34'
def myfunc(self):
return self.a
>>> import inspect
>>> inspect.getmembers(MyClass, lambda a:not(inspect.isroutine(a)))
[('__class__...
How to get a complete list of object's methods and attributes?
...
For the complete list of attributes, the short answer is: no. The problem is that the attributes are actually defined as the arguments accepted by the getattr built-in function. As the user can reimplement __getattr__, sudden...
SQL SELECT WHERE field contains words
... faster, you need to look into full text search, and this is very specific for each database type.
share
|
improve this answer
|
follow
|
...
Get the name of the currently executing method
$0 is the variable for the top level Ruby program, but is there one for the current method?
5 Answers
...
How do I get the path and name of the file that is currently executing?
...e? I've answered similar question using inspect.getabsfile() and it worked for all cases that I've tried.
– jfs
Apr 5 '14 at 17:04
4
...
Why do some functions have underscores “__” before and after the function name?
...
From the Python PEP 8 -- Style Guide for Python Code:
Descriptive: Naming Styles
The following special forms using leading or trailing underscores are
recognized (these can generally be combined with any case convention):
_single_leading_under...
MySQL vs MongoDB 1000 reads
...corporate it into their codebase.
People are seeing real world MongoDB performance largely because MongoDB allows you to query in a different manner that is more sensible to your workload.
For example, consider a design that persisted a lot of information about a complicated entity in a normalised...