python-3.2 Archives - Page 3 of 65

Python is a powerful general-purpose programming language.

Filtering a list of strings based on contents

November 24, 2020 Oceane Wilson

Question or problem about Python programming: Given the list [‘a’,’ab’,’abc’,’bac’], I want to compute a list with strings that have ‘ab’ in them. I.e. the result is [‘ab’,’abc’]. How can this be done in Python?

Python Selenium accessing HTML source

November 24, 2020 Ollie MC

Question or problem about Python programming: How can I get the HTML source in a variable using the Selenium module with Python?

Simple way to create matrix of random numbers

November 24, 2020 Ollie MC

Question or problem about Python programming: I am trying to create a matrix of random numbers, but my solution is too long and looks ugly

how to convert a string date into datetime format in python?

November 24, 2020 Ollie MC

Question or problem about Python programming: How do I convert a a string of datetime into datetime format in python so that it can be compared with another date? string_date = “2013-09-28 20:30:55.78200” abc = datetime.datetime.now() if abc > string_date : print True How to solve the problem: Solution 1: The particular format for strptime: […]

Functions Defined The core of extensible programming is defining functions. Python allows mandatory and optional arguments, keyword arguments, and even arbitrary argument lists.

How can I do DNS lookups in Python, including referring to /etc/hosts?

November 24, 2020 Oceane Wilson

Question or problem about Python programming: dnspython will do my DNS lookups very nicely, but it entirely ignores the contents of /etc/hosts.

Case Insensitive Flask-SQLAlchemy Query

November 24, 2020 Abreonia Ng

Question or problem about Python programming: I’m using Flask-SQLAlchemy to query from a database of users; however, while

How to convert a date string to different format

November 24, 2020 Jeffrey Schneider

Question or problem about Python programming: I need to convert date string “2013-1-25” to string “1/25/13” in python. I looked at the datetime.strptime but still can’t find a way for this. How to solve the problem: Solution 1: I assume I have import datetime before running each of the lines of code below datetime.datetime.strptime(“2013-1-25”, ‘%Y-%m-%d’).strftime(‘%m/%d/%y’) […]

Multiprocessing : use tqdm to display a progress bar

November 24, 2020 Odhran Miss

Question or problem about Python programming: To make my code more “pythonic” and faster, I use “multiprocessing” and a map function to send it a) the function and b) the range of iterations.

Python update a key in dict if it doesn’t exist

November 24, 2020 Jeffrey Schneider

Question or problem about Python programming: I want to insert a key-value pair into dict if key not in dict.keys(). Basically I could do it with:

Why does pylint object to single character variable names?

November 24, 2020 Odhran Miss

Question or problem about Python programming: I’m still getting used to python conventions and using pylint to make my code more pythonic, but I’m puzzled by the fact that pylint doesn’t like single character variable names. I have a few loops like this: