Scope
scope rules how variables and names are looked up in your code. It determines the visibility of a variable within the code.
LEGB rule
- Local - The names that you define in this scope are only available or visible to the code within the scope.
- Enclosing - is a special scope that only exists for nested functions.
- Global - The names that you define in this scope are available to all your code.
- Built-in - is a special Python scope that’s created or loaded whenever you run a script or open an interactive session.
Python scopes are implemented as dictionaries that map names to objects
Names that you define in the enclosing Python scope are commonly known as nonlocal names
From the moment you start a Python program, you’re in the global Python scope
- You can’t modify names in the enclosing scope from inside a nested function unless you declare them as nonlocal in the nested function
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