A REPL is an interactive Python environment that reads your code, evaluates it, prints the result, and waits for the next command. It is a friendly place to try small ideas before adding them to a program. section 3.0
In the Mu editor, a REPL lets you:
- Run expressions such as print('hello world') and 2 + 2. section 3.0
- See numbered inputs such as In [1] and results such as Out[2]. section 3.0
- Test functions and inspect values such as string and list lengths. section 3.0 section 3.1
Try a few commands
Type 2 + 2 to get 4, then try len('abcd') to get 4. You can also assign s = 'hello' and ask len(s), or create n = [1, 2, 3] and ask len(n). section 3.0
Use the REPL when a program needs a quick experiment. For example, testing len(title) * '-' shows how to create a divider whose length matches a menu title. section 3.0
