I read that my_dict.keys() returns the dynamic view to iterate over the dictionary. I usually iterate the dictionary without the keys() function. So my question is, are below two code blokes are same? if not, what performance differences do these two have (which one is more optimized) Note: I usually use pyth…
Tag: python-3.x
Set alphanumeric regex pattern not accepting certain specific symbols
I need to set in the variable some_text a pattern that identify any alphanumeric substrings (that could possibly contain symbols included, such as : , $, #, &, ?, ¿, !, ¡, |, °, , , ., (, ), ], [, }, { ), and with the possibility of containing uppercase and lowercase characters, but the only symbols that …
What does this “.children” attribute do?
I’m trying to understand a Key-Bigram extractor’s working and I cannot understand what does the following block of code do. Here is the source code. Everything else is workin fine and I understood well, however I can not understand what child for child in possible_words.children does. Answer token…
confusion with the reverse() function in python .why does it reverse both of the list in this specific question
Q3. Consider the following Python function: If we call the function maf with the list a and then with the list b with the values give bellow: a = [17, 38, 10, 25, 72] b = [10, 30, 20, 30, 10] What is the value returned by each call? Answers (choose one): a) maf(a) returns True and maf(b) returns True
I get the same output for a classifier algorithm with sklearn and pandas
Problem I get the same output everytime regardless of the input. Context I have a .csv with IDs that represent a team of 5 persons (previously formed teams) like this: My goal with the following code is to be able to input 4 IDs and get a prediction of what the 5th member should be. Answer Mainstream statisti…
How to distinquish between floats, ints and scientific notation
I’m writing a custom json compresser. It is going to be reading numbers in all formats. How do I print the values of the json in the format, it is given, with json.load(). I would also want to preserve the type. Example of a file it would have to read would be: I would also want it to be able
Pre-commit hook throws error on hatchling requirement
I’m following the pre-commit directions to install git pre-commit hooks for python code formatting from black to my flask repo. I’ve added pre-commit to my requirements.txt and my pre-commit-config.yaml file looks like After installing pre-commit using pip install pre-commit and installing the git…
Convert epoch to human-readable date python
I want to convert from epoch to date like that : 1575135888 ==> 3 years ago (https://i.stack.imgur.com/x2ZPW.png) I have this code : I got 2022-12-09 and 2019-11-30 18:44:48 I don’t know how to convert it to 3 years ago. Answer Well, you could use timedelta like this: Output: But I’m afraid tha…
Formulating the constraint x[i+1]<= x[i] in Pyomo
I have my decision variable x which is indexed on the list N. I want the constraint that x[i+1] <= x[i] or x[i] <= x[i-1]. But how do I do this in Pyomo without going out of range with my index? This thus doesn’t work. Anyone an idea how to do this? Answer You could use Constraint.Skip to avoid ac…
colors are wrong numpy array for pillow image when I use txt
firstly I am transforming an image into numpy array and writing it to a text file and this part is working the problem is when i copy the txt content and dynamically paste it as vector and display the image. the colors are showing wrong. enter image description here enter image description here ` ` I need to …