PCPP1 Practice Test 8 — 10 Questions

Question 1

Which magic method should you implement to make your objects support the 'with' statement context manager?

Accepted Answer

__enter__ and __exit__. The __enter__ and __exit__ methods are required to implement the context manager protocol.

Answer

__context__

Answer

__open__ and __close__

Answer

__init__ and __del__

Question 2

According to PEP 257, what is the standard format for a single-line docstring?

Accepted Answer

Use triple quotes and keep the summary on the same line, ending with a period.. A single-line docstring should be on the same line as the opening triple quotes, ending with a period.

Answer

Use a single quote for the entire block.

Answer

The docstring should span three lines including the summary.

Answer

The summary should start on the next line.

Question 3

You are building a REST client that needs to handle 429 Too Many Requests status codes. Which strategy is most effective when implementing an automatic retry mechanism?

Accepted Answer

Implement an exponential backoff strategy with jitter. Implementing exponential backoff ensures that you do not overwhelm the server while waiting for the rate limit to reset.

Answer

Switch to a different base URL immediately

Answer

Ignore 429 errors and continue execution

Answer

Retry immediately in a loop until successful

Question 4

Which magic method is used to control how an instance is displayed when using the print() function?

Accepted Answer

__str__. print() implicitly calls str(obj), which in turn calls __str__.

Answer

__display__

Answer

__repr__

Answer

__print__

Question 5

You are writing to a CSV file. If your data contains the delimiter character itself (e.g., a comma in a text field), what does the csv module do by default?

Accepted Answer

It quotes the field.. The csv module automatically wraps such fields in quotes.

Answer

It raises a csv.Error.

Answer

It ignores the delimiter.

Answer

It escapes the character with a backslash.

Question 6

When using configparser, how do you handle multiline values?

Accepted Answer

Indent the subsequent lines.. You indent lines following the initial line within the option.

Answer

Use a backslash at the end of each line.

Answer

Wrap them in triple quotes ('''...''').

Answer

Use the '
' escape character.

Question 7

You are using sqlite3 and need to enforce foreign key constraints. How do you enable them?

Accepted Answer

connection.execute('PRAGMA foreign_keys = ON'). You must execute the command 'PRAGMA foreign_keys = ON;' on the connection.

Answer

It is enabled by default.

Answer

connection.execute('SET FOREIGN_KEYS ON')

Answer

connection.enable_foreign_keys()

Question 8

Which of the following headers is commonly used in REST APIs to indicate the format of the request body?

Accepted Answer

Content-Type. The 'Content-Type' header tells the server what type of media is being sent in the request body.

Answer

Authorization

Answer

Accept

Answer

User-Agent

Question 9

When sending a JSON payload with 'requests.post()', which argument should you use to automatically set the 'Content-Type' to 'application/json'?

Accepted Answer

json=payload. The 'json' argument automatically serializes the data and sets the correct headers.

Answer

data=json.dumps(payload)

Answer

params=payload

Answer

body=payload

Question 10

What is the primary risk of using 'getattr' without a default value?

Accepted Answer

It raises an AttributeError.. If the attribute is not found, it raises an AttributeError, potentially crashing the application if not handled.

Answer

It returns None.

Answer

It enters an infinite loop.

Answer

It creates the attribute.