Advertisements I’m analyzing some old code that I’ve inherited, and I have a question about the use of "self" and "None" keywords, specifically in the following example: def run(self) -> None: I understand that the self keyword is similar to the "this" keyword in C++ in that, in conjunction with the dot operator, it allows… Read More Use of None and self keywords in method construction
Advertisements A colleague and I just stumbled across an interesting problem using an f-string. Here is a minimal example: >>> f"{ 42:x}" ‘2a’ Writing a space after the hexadecimal type leads to a ValueError: >>> f"{ 42:x }" Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: Invalid format specifier I understand… Read More Space in f-string leads to ValueError: Invalid format specifier
Advertisements I’d like to code something like this. function cokeDispencer(id) { const dict = {1:"sprite", 2:"pepcy", …} // Some JSON. It might be bigger. return dict[id]; } Of course, dict[id] is much simpler way to do the same, but I want put the dict object inside of function so that no other function can access… Read More is const variable in javascript function initialized every time when it called or just once?
Advertisements So this is the class i’m testing: class Test: def find_string(self, string): self.string = string return string.find(string) def add_string(self, string): found = self.find_string(‘bar’) if found == -1: string = string + ‘ bar’ return string Here is my setup: test_string = ‘foo’ Test1 = Test() new_string = Test1.add_string(string) Results Expected result: foo bar Result:… Read More Python Class – Can't find out how to use method return value within another method
Advertisements having the following dataframe: import pandas as pd cars = ["BMV", "Mercedes", "Audi"] customer = ["Juan", "Pepe", "Luis"] price = [100, 200, 300] year = [2022, 2021, 2020] df_raw = pd.DataFrame(list(zip(cars, customer, price, year)),\ columns=["cars", "customer", "price", ‘year’]) I need to do one-hot encoding from the categorical variables cars and customer, for this I… Read More Python pandas: dynamic concatenation from get_dummies
Advertisements I come across this issue often, and I would be surprised if there wasn’t some very simple and pythonic one-liner solution to it. Suppose I have a method or a function that takes a list or some other iterable object as an argument. I want for an operation to be performed once for each… Read More What is the pythonic way of "iterating" over a single item?
Advertisements How can I write import foo.bar in __init__.py so it will load the system-wide version of foo/bar.py when run from most places, but will load the local version of bar.py when run from within foo‘s source directory? # foo/__init__.py from foo.bar import baz baz() # foo/bar.py def baz: print(‘Hello") This will always load the… Read More Python imports in deployed/local packages
Advertisements I have a call to a function which returns a lot of elements, and the way to respect PEP8 is to do the following, but I don’t find it very readable: colonne_dernier_attribut, colonne_non_explained_beads, colonne_non_explained_beads_recipient, \ colonne_non_explained_beads_donor, colonne_score, colonne_comments, colonne_loci_manquants, \ colonne_edta, colonne_temps, colonne_summary = \ formatageRes(ws, wrsep, wdsep, feuille, feuille_corrigee, all_epitopes_considered, nbr_ep_considered, nrows) I… Read More Python readibility of long statement
Advertisements Let’s say we want to test if the first character of b"hello" is a b"h": s = b"hello" print(s[0] == b"h") # False <– this is the most obvious solution, but doesn’t work print(s[0] == ord(b"h")) # True, but not very explicit What is the most standard way to test if one character (not… Read More How to test individual characters of a bytes string object?