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What are the differences between B trees and B+ trees?
... fit on a page of memory. Therefore, it will require fewer cache misses in order to access data that is on a leaf node.
The leaf nodes of B+ trees are linked, so doing a full scan of all objects in a tree requires just one linear pass through all the leaf nodes. A B tree, on the other hand, would re...
Python Sets vs Lists
In Python, which data structure is more efficient/speedy? Assuming that order is not important to me and I would be checking for duplicates anyway, is a Python set slower than a Python list?
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What is the best collation to use for MySQL with PHP? [closed]
...ents and sorting as if it were ASCII
utf8_unicode_ci uses the Unicode sort order, so it sorts correctly in more languages
However, if you are only using this to store English text, these shouldn't differ.
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Can you provide some examples of why it is hard to parse XML and HTML with a regex? [closed]
...HTML and XML are recursive structures which require counting mechanisms in order to properly parse. A true regex is not capable of counting. You must have a context free grammar in order to count.
The previous paragraph comes with a slight caveat. Certain regex implementations now support the ide...
Alternate FizzBuzz Questions [closed]
...andidates, just like FizzBuzz. Here are some of the problems I've seen, in order of increasing difficulty:
Reverse a string
Reverse a sentence ("bob likes dogs" -> "dogs likes bob")
Find the minimum value in a list
Find the maximum value in a list
Calculate a remainder (given a numerator and de...
How to use permission_required decorators on django class-based views
... you put the Mixin first in the inheritance list (so the Method Resolution Order picks the Right Thing).
The reason you're getting a TypeError is explained in the docs:
Note:
method_decorator passes *args and **kwargs as parameters to the decorated method on the class. If your method does not...
how do you push only some of your local git commits?
...r example.
If the commits you want to push are non-consecutive, simply re-order them with a git rebase -i before the specific push.
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Alter Table Add Column Syntax
... column to the beginning of the table (as this is easier than altering the order). Also, if there is data in the Employees table, it has to do insert select * so it can calculate the EmployeeID.
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Python data structure sort list alphabetically
...ntrigue', 'Sedge', 'Stem', 'Whim']
You can also sort the list in reverse order by doing this:
In [12]: sorted(lst, reverse=True)
Out[12]: ['constitute', 'Whim', 'Stem', 'Sedge', 'Intrigue', 'Eflux']
In [13]: sorted(lst, key=str.lower, reverse=True)
Out[13]: ['Whim', 'Stem', 'Sedge', 'Intrigue', ...
JavaScript hashmap equivalent
... three major ways to keep a collection of objects addressable by a key:
Unordered. In this case to retrieve an object by its key we have to go over all keys stopping when we find it. On average it will take n/2 comparisons.
Ordered.
Example #1: a sorted array — doing a binary search we will find...