What LEGB means

Question

What LEGB means

Accepted Answer

When Python sees a name like x, it looks first in the current function's local scope, then in any enclosing function scopes (for closures), then in the module-level global scope, and finally in the built-in scope where names like len and print live. The search stops at the first match. If none is found, you get a NameError. You need global or nonlocal only when assigning to a name in an outer scope - reading follows LEGB automatically.