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List directory in Go
...ts of a directory and speed is of essence, note that using Readdirnames is orders of magnitude faster (around 20x faster for me)
– SquattingSlavInTracksuit
Oct 14 '19 at 12:41
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How to convert an OrderedDict into a regular dict in python3
I am struggling with the following problem:
I want to convert an OrderedDict like this:
8 Answers
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How does a hash table work?
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Each bucket can have multiple records which are organized in a particular order.
Real World Example:
Hash & Co., founded in 1803 and lacking any computer technology had a total of 300 filing cabinets to keep the detailed information (the records) for their approximately 30,000 clients. Each...
Simple way to find if two different lists contain exactly the same elements?
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If you care about order, then just use the equals method:
list1.equals(list2)
From the javadoc:
Compares the specified object with
this list for equality. Returns true
if and only if the specified object is
also a list, both lists...
What is the difference between Θ(n) and O(n)?
...ions aren't necessarily specific numbers, but instead functions of varying orders of magnitude such as log(n), n, n^2, (etc.).
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How does HashSet compare elements for equality?
...y the default equality comparer.
Note how none of this is in terms of an ordered comparison - which makes sense, as there are certainly situations where you can easily specify equality but not a total ordering. This is all the same as Dictionary<TKey, TValue>, basically.
If you want a set w...
How to normalize an array in NumPy?
...iving optimal performance.
import numpy as np
def normalized(a, axis=-1, order=2):
l2 = np.atleast_1d(np.linalg.norm(a, order, axis))
l2[l2==0] = 1
return a / np.expand_dims(l2, axis)
A = np.random.randn(3,3,3)
print(normalized(A,0))
print(normalized(A,1))
print(normalized(A,2))
prin...
URL-parameters and logic in Django class-based views (TemplateView)
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In case you pass URL parameter like this:
http://<my_url>/?order_by=created
You can access it in class based view by using self.request.GET (its not presented in self.args nor in self.kwargs):
class MyClassBasedView(ObjectList):
...
def get_queryset(self):
order_by...
SQL Server add auto increment primary key to existing table
... I would like to start counting at 1000. I suspect I can use ALTER TABLE ORDER ALTER COLUMN ORDERNO RESTART WITH 1 but I didn't want to try it without checking with an expert :) Ref. pic.dhe.ibm.com/infocenter/iseries/v7r1m0/…
– user1477388
Mar 8 '13 at 1...
MySQL DROP all tables, ignoring foreign keys
...ed to make porting easier. In MySQL 5.5, they do nothing."
Therefore, in order for the drop statements to work if you need:
SET FOREIGN_KEY_CHECKS = 0
This will disable referential integrity checks - so when you are done performing the drops you need, you will want to reset key checking with
S...