Python File Input and Output 2

Question 1

What does the 'a+' mode do when opening a file in Python?

Accepted Answer

Opens for reading and writing, pointer at end, creates file if missing

Answer

The 'a+' mode opens a file for both reading and appending; the pointer is at the end and the file is created if it does not exist.

Question 2

Which method reads all lines of a file into a list?

Accepted Answer

file.readlines()

Answer

file.readlines() returns a list where each element is a line from the file including the newline character.

Question 3

What happens if you call open() with mode 'x' on a file that already exists?

Accepted Answer

It raises a FileExistsError

Answer

Mode 'x' is exclusive creation; it raises FileExistsError if the file already exists.

Question 4

What does the os.path.getsize() function return?

Accepted Answer

File size in bytes

Answer

os.path.getsize(path) returns the size of the file at the given path in bytes.

Question 5

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

Accepted Answer

os.rename()

Answer

os.rename(src, dst) renames the file or directory from src to dst.

Python Practice Test