Namespaces & Scope | 18/100 Days of Python Algo Trading

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If you’re here, it means you’re truly dedicated to mastering Python. Directly below, you’ll find a quiz designed to help you reinforce what you’ve just learned. This isn’t just about recalling facts; it’s about deeply understanding the concepts. Take a moment to answer the questions and see how well you can apply the knowledge from the video. You’re doing great—every question you tackle brings you one step closer to becoming a Python expert!

Day 18: Namespaces

1. What is a namespace in Python?

A) A method by which Python stores binary data.

B) A location where Python keeps a record of all incoming data.

C) A container where names are mapped to objects, allowing for the tracking of variable names during program execution.

D) A library used to enhance memory usage.

2. What does the LEGB rule stand for in Python?

A) Local, Enclosed, Global, Built-in

B) Local, Entry, General, Base

C) Linked, Enclosed, General, Binary

D) Long, Evaluate, Get, Bind

3. In the context of the LEGB rule, what is considered a 'Local' scope?

A) Variables defined within a function.

B) Variables defined outside of any function.

C) Variables imported from modules.

D) Variables built into Python.

4. Which scope would a variable belong to if it is defined at the top of a file?

A) Local

B) Enclosing

C) Global

D) Built-in

5. How can you access a global variable from within a function?

A) Using the global keyword before the variable name.

B) Declaring the variable as global at the start of the script.

C) Using the extern keyword.

D) Global variables are automatically accessible from anywhere in the script.

6. What is true about the 'Built-in' scope?

A) It contains Python's built-in exceptions.

B) It includes all external libraries.

C) It refers to the namespace containing Python’s built-in functions and exceptions.

D) It is accessible only after importing specific modules.

7. How does Python resolve names using the LEGB rule when a name is referenced?

A) It starts at the Built-in scope and moves outwards.

B) It starts at the Local scope and moves to the Enclosing, Global, and then Built-in scopes.

C) It starts at the Global scope and moves inward.

D) It randomly selects a scope based on the interpreter's configuration.

8. Which scenario would cause a NameError in Python?

A) Trying to access a local variable in an enclosing function.

B) Referencing a variable that hasn’t been defined or isn’t in the accessible scope.

C) Assigning a value to a built-in function.

D) Using the global keyword inside a function.

9. How would you modify a global variable inside a function?

A) Just assign a new value to it.

B) Declare the variable as global within the function using the global keyword.

C) Re-import the variable from the module.

D) Global variables cannot be modified inside functions.

10. What does the 'Enclosing' scope refer to?

A) The scope of the Python environment where the script runs.

B) The scope that covers the innermost function that surrounds any executing code.

C) The scope between local and global scopes.

D) The module where the current function is defined.

11. When does Python create a new local namespace?

A) Each time a function is called.

B) When a new file is opened.

C) At the start of the script execution.

D) When a module is imported.

12. What is the effect of the nonlocal keyword in Python?

A) It declares a variable as not belonging to any namespace.

B) It allows modification of a variable from an enclosing scope, but not globally.

C) It specifies that no variables are local to a function.

D) It makes a variable accessible across multiple modules.

13. Which Python statement is used to bring a variable from the global namespace into another scope?

A) import

B) extern

C) global

D) public

14. What would be a common example of a 'Local' variable in algorithmic trading?

A) A variable that holds the API key for trade execution.

B) A loop counter used to iterate over trades.

C) A variable that stores the system configuration.

D) A variable that tracks the version of the trading algorithm.

15. How can encapsulating code in a function affect variable scope?

A) Variables declared within the function are considered global.

B) Variables declared within the function are not accessible outside it.

C) It has no impact on the scope of variables.

D) All variables within the function are static.

16. What type of error results from trying to modify an enclosing scope variable inside a function without nonlocal?

A) SyntaxError

B) NameError

C) TypeError

D) UnboundLocalError

17. Which statement about namespace is false?

A) Each module creates its own global namespace.

B) Namespaces can be nested.

C) A namespace can exist independently of other namespaces.

D) Namespaces must be manually cleaned up after execution to prevent memory leaks.

18. In the context of LEGB, what would you define as an 'Enclosing' variable example?

A) A variable defined in a script at the top level.

B) A variable defined within a nested function.

C) A variable defined in a built-in Python module.

D) A variable defined in the global scope of a module.

19. What is not a feature of Python namespaces?

A) They are created at runtime.

B) They are deleted as soon as the program ends.

C) They can change dynamically as new names are defined.

D) They can only change when the interpreter is restarted.

20. Which Python feature ensures that a function can access names that belong to more than one enclosing function?

A) The global declaration

B) The nonlocal declaration

C) The external declaration

D) The inclusive declaration