PCAP File I/O and String Operations

Question 1

Which built-in function is used to open a file in Python?

Accepted Answer

open()

Answer

The `open()` function opens a file and returns a file object for reading or writing.

Question 2

What mode string opens a file for writing, creating it if it does not exist and truncating if it does?

Accepted Answer

'w'

Answer

Mode `'w'` opens a file for writing, creating it if absent and clearing it if it exists.

Question 3

What does the `with` statement do when used with `open()`?

Accepted Answer

Automatically closes the file when the block exits

Answer

The `with` statement is a context manager that ensures the file is closed when the block ends, even on exceptions.

Question 4

Which method reads the entire file content as a single string?

Accepted Answer

read()

Answer

`file.read()` reads the entire file and returns it as a single string.

Question 5

What does `file.readlines()` return?

Accepted Answer

A list of strings, one per line

Answer

`readlines()` reads all lines and returns them as a list of strings including newline characters.

PCAP - Certified Associate in Python Programming Practice Test