Python
ModuleNotFoundError: No Module Named ‘mysql’
The MySQL connector is not installed in the Python you are running. Here is how to install the right package, check which…
Python
Plain-English Python guides, from installing it to writing small programs that do real work. Short examples you can copy, run and change.
72 guides
Python
Mastering Python: Solving Dict TypeError
The five TypeErrors dictionaries throw — unhashable type, not subscriptable, not callable, missing arguments and unsupported operand — and the fix for…
Python
Conda Error: Argument COMMAND Invalid Choice ‘activate’
This error means your shell has not been set up for conda. Here is what conda init does, why it is needed,…
Python
AttributeError: Module NumPy Has No Attribute typeDict
This error means a library is calling a NumPy alias that was removed in NumPy 1.24. Here is how to identify which…
Python
Understanding Python If Else Statements
How if, elif and else work in Python, what counts as true, and the six mistakes that trip beginners up — colons,…
Python
Web Scraping and Automation
How to scrape a web page with Python responsibly: requests and BeautifulSoup, reading robots.txt, rate limiting, and when to use an API…
Python
Python Recursion Error: Fixing Maximum Depth Exceeded
RecursionError means your function called itself too many times. Here is how to find the missing base case, when to raise the…
Python
Python Dictionary Key Checking with in
How to check whether a key exists in a Python dictionary, why the in operator beats has_key and try/except, and when .get()…
Python
Conductance: Graph Community Detection in Python
What graph conductance measures, why a low score means you have found a real community, and how to compute it in Python…
Python
Python Tuple Comprehension: A Beginner’s Guide
Python has no tuple comprehension. Here is what the parentheses actually create, how to build a tuple from a comprehension, and when…
Python
Python Basics
The core of Python in one page: variables, types, conditions, loops, functions and lists, each with a runnable example and the mistake…
Python
Python Not Working on a Mac After Installation
Installed Python on macOS and the terminal still says command not found, or runs the wrong version? python vs python3, Homebrew vs…
Related topics
Where to go next
Programming Basics
The ideas every language shares — variables, loops, functions and how a program actually runs.
17 guides
JavaScript
How JavaScript works in the browser, explained with short examples you can paste and run.
32 guides
Web Development
HTML, CSS and the pieces that turn code into a page people can visit.
13 guides
Keep going — pick your next guide
The fastest way to improve is to read one guide, then build the thing it describes. Start with the basics, or jump straight to a project.