Quick Check: Python Names, Scopes, and Namespaces

Review

1. What is a namespace in Python?

   A namespace organizes bindings between names and objects.
2. A function assigns to name value. What normally happens to value inside that function?

   A binding in a function normally creates a local name unless global or nonlocal changes that rule.
3. A module has count = 10. Inside a function, print(count) appears before count = count + 1. Why does calling the function raise UnboundLocalError instead of reading the module-level count?

   Python determines the local binding from the function block. Because count is assigned in that block, the earlier read targets the local name rather than falling back to the global binding. UnboundLocalError is a subclass of NameError.
4. Which scope is searched first for an ordinary name used inside a function?

   Name resolution starts with the current local scope.
5. What does global allow a function to rebind?

   global directs the specified name to the module-level global namespace for that function.
6. What does nonlocal allow a nested function to rebind?

   nonlocal targets an existing binding in the nearest enclosing function scope.