The impact of multiple compiler definitions in system.codedom in web.config
All my ASP.NET web projects are being developed exclusively in VB.NET. (And so are the satellite DLL projects, which is probably less relevant.
performance
open connection before every single nonquery or one connection for the whole?
If I have about 2000 record and I make a multiple insert. Which method has better performance than the other?
NumPy array row differences
I have a NumPy array vectors = np.random.randn(rows, cols). I want to find differences between its rows according to some other array diffs which is sparse and “2-hot”: containing a 1 in its column corresponding to the first row of vectors and a -1 corresponding to the second row. Perhaps an example shall make it clearer:
How to create a new dataframe column with a set of nested IF rules (apply is very slow)
What I need I need to create new columns in pandas dataframes, based on a set of nested if statements. E.g. if city == 'London' and income > 10000: return 'group 1' elif city == 'Manchester' or city == 'Leeds': return 'group 2' elif borrower_age > 50: return 'group 3' else: return 'group 4' This … Read more
String formatting: % vs. .format vs. f-string literal
Python 2.6 introduced the str.format() method with a slightly different syntax from the existing % operator. Which is better and for what situations?
When should I (not) want to use pandas apply() in my code?
I have seen many answers posted to questions on Stack Overflow involving the use of the Pandas method apply. I have also seen users commenting under them saying that “apply is slow, and should be avoided”.
Get difference between two lists
I have two lists in Python:
Fastest way to check if a value exists in a list
What is the fastest way to know if a value exists in a list (a list with millions of values in it) and what its index is?
Does pandas iterrows have performance issues?
I have noticed very poor performance when using iterrows from pandas.
How to improve performance of this code?
Thanks to some help from people here, I was able to get my code for Tasmanian camels puzzle working. However, it is horribly slow (I think. I’m not sure because this is my first program in Python). The example run in the bottom of the code takes a long time to be solved in my machine: