Best Practices - Quiz

Use a style-checking tool to verify that the current file follows PEP 8 naming and spacing rules.

Format the value of total_requests into a readable string using an f-string before logging it.

Retrieve a configuration value with a safe default so the code remains robust in production.

According to PEP 8, which function name is preferred for readability?

Which is the most PEP 8 compliant way to add spaces around an assignment?

Which tool is commonly used to automatically format Python code according to a consistent style?

Which file is typically used to provide a high-level overview and usage instructions for a Python project?

Where should a function’s docstring be placed to follow best practices?

Which of the following is the most Pythonic way to iterate over items in a list with their index?

Which design pattern best describes a class that provides a single shared database connection instance?

A class that handles logging, database access, and HTTP requests all together is an example of which anti-pattern?

Which data structure is usually best for fast membership checks in large collections?

Which practice helps protect a Python application from known vulnerabilities in third-party packages?

Which line keeps code within the recommended 79-character limit when building a long string?

Order the steps to add documentation to a new Python module and make it discoverable.

Drag and drop to reorder, or use the arrows.

Order the steps to safely optimize a slow function in a production codebase.

Drag and drop to reorder, or use the arrows.

What is the output of this code that uses a Pythonic list comprehension?

1numbers = [1, 2, 3, 4]
2result = [n * 2 for n in numbers if n % 2 == 0]
3print(result)

What is the output when accessing a dictionary using the get method with a default?

1config = {"timeout": 10}
2value = config.get("retries", 3)
3print(value)

What is the output of this code using a small Singleton-like cache?

1class Settings:
2    _instance = None
3    def __new__(cls):
4        if cls._instance is None:
5            cls._instance = super().__new__(cls)
6        return cls._instance
7
8first = Settings()
9second = Settings()
10print(first is second)

What is the output when using a set for membership testing?

1allowed_roles = {"admin", "editor", "viewer"}
2print("guest" in allowed_roles)

What is the output of this code that uses a docstring and prints the function’s __doc__?

1def greet(name):
2    """Return a polite greeting."""
3    return f"Hello, {name}!"
4
5print(greet.__doc__)

Find the bug in this code that is meant to validate user input and log an error.

Click on the line(s) that contain the bug.

import logging

logger = logging.getLogger(__name__)

def get_age(age):

    if not isinstance(age, int) or age < 0:

        logger.error("Invalid age: %s", age)

        raise ValueError("Age must be non-negative integer")

    return age

Find the bug in this code that attempts to cache configuration in a Singleton-style class.

Click on the line(s) that contain the bug.

class Config:

    _instance = None

    def __new__(cls, settings=None):

        if cls._instance is None:

            cls._instance = super().__new__(cls)

            cls.settings = settings or {}

        return cls._instance

config1 = Config({"debug": True})

config2 = Config({"debug": False})

Match each design pattern to its primary intent.

Click an item on the left, then click its match on the right. Click a matched item to unmatch.

Match each security practice with its description.

Click an item on the left, then click its match on the right. Click a matched item to unmatch.

Complete the function to document and compute an average response time using Pythonic tools.

Complete this secure function that reads a setting with a safe default and validates it.

Complete this Pythonic function that returns a sorted list of unique user IDs.

Complete this context manager-based function to measure execution time of a block.

Click the line that violates PEP 8 naming conventions for a constant.

Click on the line to select.

MAX_CONNECTIONS = 10

pi_value = 3.14159

DbHost = "db.internal"

DEFAULT_TIMEOUT = 5

Click the line that represents the God Object anti-pattern by taking on too many responsibilities.

Click on the line to select.

class UserService:

    def create_user(self, data):

        self._save_to_db(data)

        self._send_welcome_email(data)

        self._rebuild_search_index()