Quizzes

Python quiz

37 questions from the Python track. Score 80% or higher to unlock a certificate.

1. Why Python for Agents

   1. How does output appear in the Python boxes on this site?

   • The last line is always shown for you
   • You call print(), and that text is the output
   • The site emails the result to you
   • Only errors are shown

2. Variables and Names

   2. Which name follows usual Python style for a variable?

   • MaxSteps
   • max_steps
   • max-steps
   • maxSteps

3. Types: Numbers, Text, True/False, and None

   3. What is bool("False") in Python?

   • False, because the text says false
   • True, because non-empty text counts as yes
   • None
   • An error

4. Compare and Combine Values

   4. You have a = [1, 2] and b = [1, 2]. What is true?

   • a is b is True, because the rows look the same
   • a == b is True, and a is b is False
   • a == b is False
   • a is None

5. Strings (Text)

   5. What does "abcdef"[1:4] return?

   • "abcd"
   • "bcd"
   • "bcde"
   • "abcdef"

6. Numbers and Math

   6. What is the value of 7 // 2 in Python 3?

   • 3.5
   • 3
   • 4
   • "3"

7. True, False, and None

   7. Why can if result lie when result is 0?

   • 0 counts as False, even when 0 is a real answer
   • 0 is the same as None
   • print cannot show 0
   • 0 is not a number

8. Lists

   8. What does memory.append("act") give you back?

   • A new list that includes "act"
   • The string "act"
   • None, and the list itself is changed
   • A copy of the list

9. Index and Slice

   9. What does "abcd"[1:3] give you?

   • "abc"
   • "bc"
   • "bcd"
   • "abcd"

10. Tuples and Sets

    10. How do you write an empty set?

    • {}
    • set()
    • []
    • ()

11. Dictionaries

    11. What does action.get("thought", "") give you if thought is missing?

    • A KeyError crash
    • None
    • an empty string
    • False

12. Nested Data (Traces)

    12. How do you read a nested field without crashing if a key is missing?

    • trace["meta"]["source"]
    • trace.get("meta", {}).get("source")
    • trace.source
    • get(trace, "meta.source")

13. If, Elif, and Else

    13. What does handle_query("") return if empty text is treated as false?

    • ok
    • empty
    • a crash
    • None

14. Match and Case

    14. What does case _ mean in a match?

    • It matches only empty dicts
    • It matches anything that did not fit a case above
    • It is a syntax error in Python 3.12
    • It runs every case

15. Loops and Budgets

    15. Which loop fits "run until the goal is true or steps hit 8"?

    • for item in goal
    • while used < 8 and not goal_done
    • if used < 8
    • range(goal)

16. Functions

    16. What does return do that print does not?

    • Shows text on the screen for a person
    • Sends a value back to the caller so other code can use it
    • Writes a docstring
    • Stores the function in a dict

17. Scope, Defaults, and Extra Arguments

    17. Why is def add_event(event, history=[]) dangerous?

    • Empty lists are not allowed as defaults
    • The same list is reused on every call that skips history
    • Python copies the list each call, which is slow
    • [] means the same as None

18. Unpacking

    18. After first, *rest = ["think", "act", "observe"], what is rest?

    • "think"
    • the list ["act", "observe"]
    • "observe" only
    • a dict of leftover keys

19. Modules

    19. When is a module’s __name__ equal to "__main__"?

    • Always, in every import
    • Never in Python 3
    • When this file is the program you started, not when it is imported
    • Only inside the math module

20. JSON and Text

    20. Which call turns a Python dict into a JSON string?

    • json.loads(data)
    • json.load(data)
    • json.dumps(data)
    • json.dump(data)

21. with, Files, and Paths

    21. Why use with when you open a file?

    • It makes Python faster
    • It closes the file even if an error happens
    • It encrypts the file
    • It skips utf-8

22. Errors and try/except

    22. What is wrong with writing except: with no error type?

    • It is too slow
    • It catches every error, including ones you should not hide
    • finally will not run
    • raise stops working

23. Copy vs Change in Place

    23. Two agents share one transcript list. Agent A appends a message. What happens?

    • Agent B is unchanged
    • Agent B’s transcript also has that message
    • Python copies the list automatically
    • id() makes a new list

24. Comprehensions

    24. When is a for-loop clearer than a comprehension?

    • Always. Never write a comprehension.
    • When you need several steps, prints, or extra checks inside the loop
    • Only when you build a dict
    • Only in the browser

25. Classes

    25. When is a function enough, with no class?

    • Never. Always write a class.
    • When you have one job and little saved state
    • Only for text
    • Only in Pyodide

26. Dataclasses

    26. What does frozen=True do on a dataclass?

    • It deletes the object after one use
    • It stops you from changing the fields after you make the object
    • It turns the object into a dict
    • It is required for every dataclass

27. Type Hints

    27. Do type hints stop a wrong JSON value when the program runs?

    • Yes. Python always blocks a wrong type.
    • No. Hints help you. You still check with isinstance.
    • Only for lists
    • Only in Python 3.12

28. Useful Standard Library

    28. Why is a long time.sleep a problem in an agent loop?

    • It deletes the log
    • It blocks. The program waits and cannot do other work.
    • It is not in the standard library
    • It prints API keys

29. Regular Expressions

    29. You have a full, clean JSON string from the model. What should you try first?

    • A long regex that matches every key
    • json.loads
    • print only, then guess
    • time.sleep

30. Logging and Secrets

    30. How should an API key appear in a log?

    • The full key, so you can debug faster
    • Replaced with ***
    • In the page title
    • Only in error rows, still full

31. Virtual Envs and pip

    31. What is a virtual env?

    • A faster kind of Python
    • A private folder of packages for one project
    • A status code from a server
    • Joeven’s pip command

32. HTTP and APIs

    32. What does status 429 mean?

    • The URL does not exist
    • Too many requests; wait and retry later may help
    • The JSON body was fine and the call worked
    • You must use eval()

33. Parse JSON from a Model

    33. Why should you never eval() text from a model?

    • eval() is slower than json.loads
    • eval() can run any Python the model wrote, which is unsafe
    • eval() cannot read dicts
    • json.loads is not in the standard library

34. Retries and Timeouts

    34. Which result should you retry?

    • HTTP 400 with the same body
    • HTTP 401 with a missing key
    • HTTP 429 or a timeout, with a max try count
    • HTTP 200

35. Async in Simple Words

    35. In this lesson, concurrent means…

    • Using extra CPU cores
    • Many jobs in flight at the same time, overlapping their waits
    • Skipping tests
    • Calling pip

36. Tests

    36. Why write tests for tools, parse_action, and goal_satisfied?

    • Models never fail
    • They are your code. A stub model is enough to check them.
    • assert only works on numbers
    • Tests replace the need for a budget

37. A Mini Agent in Python

    37. What should the loop do when it hits max_steps?

    • Keep calling the model; it will stop itself
    • Stop, even if the goal is not done
    • Delete the transcript
    • Install a new package