Runtime of dynamic programming versus it's naive recursive counterpart Question: The problem follows: You are playing a game where you start with n sticks in a pile (where n is a positive integer), and each turn you can take away exactly 1, 7, or 9 sticks from the pile (if there are fewer than 9 …
What is faster? Two list comprehensions or one and a list.copy()? Question: Which of the following is faster? a = [” for _ in range(len(x))] b = [” for _ in range(len(x))] or a = [” for _ in range(len(x))] b = a.copy() Thanks in advance! Asked By: smyril || Source Answers: You can see …
Faster way of building string combinations (with separator) than using a for loop? Question: I am working with a relatively large dataset (in Python with Pandas) and am trying to build combinations of multiple columns as a string. Let’s say I have two lists; x and y, where: x = ["sector_1", "sector_2", "sector_3", …] and …
Loop through time series data and collect specific timeframe window keeping the runtime O(N) Question: I am trying to loop through a time series data frame and for a specific time, I need to then go back 5 minutes and 10 minutes (need to make sure I also DO NOT over count the data because …
Pytest – dynamic resolution of fixtures' dependencies Question: I cannot find a solution to alter fixtures dependency in any different way than this bellow. The problem is that I need to determine the dependencies basing on pytest.config.getoption argument, instead of what’s used here (variable resolved at module level). I need to get two modes of …
How can I make a python script change itself? Question: How can I make a python script change itself? To boil it down, I would like to have a python script (run.py)like this a = 0 b = 1 print a + b # do something here such that the first line of this script …
What might be the cause of 'invalid value encountered in less_equal' in numpy Question: I experienced a RuntimeWarning RuntimeWarning: invalid value encountered in less_equal Generated by this line of code of mine: center_dists[j] <= center_dists[i] Both center_dists[j] and center_dists[i] are numpy arrays What might be the cause of this warning ? Asked By: Alex Gao …
How to get the caller class name inside a function of another class in python? Question: My objective is to stimulate a sequence diagram of an application for this I need the information about a caller and callee class names at runtime. I can successfully retrieve the caller function but not able to get a …
numpy.max or max ? Which one is faster? Question: In python, which one is faster ? numpy.max(), numpy.min() or max(), min() My list/array length varies from 2 to 600. Which one should I use to save some run time ? Asked By: Froyo || Source Answers: It’s probably best if you use something like the …
What does `__import__('pkg_resources').declare_namespace(__name__)` do? Question: In some __init__.py files of modules I saw such single line: __import__(‘pkg_resources’).declare_namespace(__name__) What does it do and why people use it? Suppose it’s related to dynamic importing and creating namespace at runtime. Asked By: rsk || Source Answers: It boils down to two things: __import__ is a Python function that …
