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Elegant ways to support equivalence (“equality”) in Python classes
When writing custom classes it is often important to allow equivalence by means of the == and != operators. In Python, this is made possible by implementing the __eq__ and __ne__ special methods, respectively. The easiest way I've found to do this is the following method:
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Is recursion ever faster than looping?
...you name things, but rather how they are compiled/interpreted. Recursion, by definition, is a mathematical concept, and has little to do with stack frames and assembly stuff.
– P Shved
Apr 16 '10 at 7:05
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Is it safe to delete a void pointer?
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Deleting via a void pointer is undefined by the C++ Standard - see section 5.3.5/3:
In the first alternative (delete
object), if the static type of the
operand is different from its dynamic
type, the static type shall be a base
class of the operand’s d...
Why use a ReentrantLock if one can use synchronized(this)?
... guarantee any particular access order. Programs using fair locks accessed by many threads may display lower overall throughput (i.e., are slower; often much slower) than those using the default setting, but have smaller variances in times to obtain locks and guarantee lack of starvation. Note howev...
Difference between Static and final?
...e the initialization of any instance variables.
A single copy to be shared by all instances of the class.
A static variable can be accessed directly by the class name and doesn’t need any object.
Syntax: Class.variable
Static method
It is a method which belongs to the class and not to the ob...
PyLint, PyChecker or PyFlakes? [closed]
...ose your check rules) on the following script :
#!/usr/local/bin/python
# by Daniel Rosengren modified by e-satis
import sys, time
stdout = sys.stdout
BAILOUT = 16
MAX_ITERATIONS = 1000
class Iterator(object) :
def __init__(self):
print 'Rendering...'
for y in xrange(-39, 3...
How can I get column names from a table in SQL Server?
...
You can obtain this information and much, much more by querying the Information Schema views.
This sample query:
SELECT *
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = N'Customers'
Can be made over all these DB objects:
CHECK_CONSTRAINTS
COLUMN_DOMAIN_USAGE
COL...
Reducing the space between sections of the UITableView
...et the footer/header/cell heights in Interface Builder under the size tab. By default the header/footer are set at 10.0.
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What is the difference between Polymer elements and AngularJS directives?
...s that Polymer is about taking the Web as we know it forward, specifically by showing how Web Components can make the Web open, share-able and extensible. AngularJS (and Ember for that matter) is about creating a framework that leverages the best parts of the browser for creating responsive applicat...
Bash script to receive and repass quoted parameters
I'm trying to get quoted parameters of a bash script to safely be received by a nested script. Any ideas?
2 Answers
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