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Results tagged with performance
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user 123200
Performance is a subset of Optimization: performance is the goal when you want the execution time of your program or routine to be optimal.
2
votes
Accepted
Leftmost bisect search to find valid perfect square
Some small points:
ternary expression
No need for return True if lo ** 2 == num else False. you can use just return lo ** 2 == num
early return
If mid**2 == num, you can return early:
sq = mid ** …
- 9,400
6
votes
Optimization of algorithm performance
import *
Since you only need sqrt and log10 from math, I would change this:
from math import *
to:
from math import sqrt, log10
PEP8
Use descriptive method names. I have no idea what dl or c mean
V …
- 9,400
6
votes
Accepted
Pandas add calculated row for every row in a dataframe
This can lead to unexpected loss of information (large ints converted to floats), or loss in performance (object dtype). …
- 9,400
4
votes
Accepted
Merge multiple pandas dataframe along with np.where to process values
keyword arguments
I had to check the documentation to find out what the 1 means in df1.drop('new_id', 1). More clear would be df1.drop('new_id', axis=1), or even better: df1.drop(columns=["type_", "ne …
- 9,400
4
votes
function future_returns for data-driven bond screening
code
Your code itself is clear, with and has only a few improvements
df
your parameter df expects actually a Series, and not a DataFrame, so I would rename this.
composition
now you first make an …
- 9,400
8
votes
Go (board game) check for removed stones
Performance
I think the main reason why the algorithm is slow, is because you start a new flood fill for every empty place on the board. …
- 9,400
2
votes
Accepted
Generation of products of power
if p ** a * primes[i+1] **b * primes[i+2] ** c > limit:
return
then I also used primes as a local variable by changing the signature: def generate4b(a, b, c, limit, primes):
Performance …
- 9,400
6
votes
Accepted
Calculate probability of dice total
import
why import product within your method, and not in the module scope?
instantiation
There is just no reason to instantiate the list in
choices = list(product(range(1, faces+1), repeat=dice) …
- 9,400
7
votes
Performance for simple code that converts a RGB tuple to hex string
memoization
The _channel_to_hex is called 3 times per pixel. It only takes 256 different inputs, so a logical first step would be to memoize the results. This can be done with either functools.lru_ca …
- 9,400
3
votes
Accepted
Count number of unique adjacent cells in a matrix
bug
in count_adjacent_islands, number_of_islands = 0 should be number_of_countries = 0
mutate original argument
Most of the time, it's a bad idea to change any of the arguments to a function unless …
- 9,400
3
votes
How to do these extraction/computations efficiently?
Python is rather slow for iterations. If your data is in a pandas Dataframe, try to do things as vectorised as possible. You even iterate over the complete dataset for each row of your dataset, for ea …
- 9,400
2
votes
Accepted
Initial Mass Function for young star clusters and disk field stars
Class
You use classes here without any benefit. Your methods don't use the self argument. If you use the class as a namespace, I would suggest you use a module.
np
Convention is to do import numpy …
- 9,400
3
votes
More elegant way to count anagrams in Python?
Additionally to mcocdawc's answer, since what I mean is too much for a comment
You need an intermediate stage.
You used the list of Counters for this. But then to find anagrams in the list is expens …
- 9,400
5
votes
Accepted
Trimming blank space from images
Split the code
This long method does a lot of things:
it reads the file
preprocesses it
searches for the bounding box of the area of interest
crops the result
writes the result to a file
Better …
- 9,400
4
votes
Accepted
Vectorized crosstabulation in Python for two arrays with two categories each
Algorithm
If you look at your code, and follow the if-elif part, you see that there are 4 combinations of i and j
i j : result
True, True : A
False, True : B
True, False : C
False, False …
- 9,400