Online Python IDE: write and run Python in your browser
Free online Python editor and interpreter. Write Python 3 code, press Run and see the output instantly. Your code runs on your own device with Pyodide (WebAssembly), so nothing is sent to a server. NumPy, pandas, Matplotlib and other tested packages load automatically when you import them. Supports multiple files, standard input, downloads and saved projects. New to Python? Start with the Python tutorial or practise with Python exercises.
LessonPython KeyError: What It Means and How to Fix It: A KeyError is raised when you use square brackets to ask a dictionary for a key it does not contain, like user["phone"] when there is no "phone" key. Back to lesson
Output