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

Opens for reading only, pointer at start

Answer

Opens for writing only, truncates file

Answer

Opens for reading and writing, truncates file

Question 2

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

Accepted Answer

file.readlines()

Answer

file.read()

Answer

file.readline()

Answer

file.readall()

Question 3

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

Accepted Answer

It raises a FileExistsError

Answer

It truncates and overwrites the file

Answer

It appends to the existing file

Answer

It returns None

Question 4

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

Accepted Answer

File size in bytes

Answer

Number of lines in the file

Answer

File size in kilobytes

Answer

Number of characters in the file

Question 5

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

Accepted Answer

os.rename()

Answer

file.rename()

Answer

shutil.rename()

Answer

os.move()

Question 6

What is the default encoding used by open() on most modern Python installations?

Accepted Answer

The locale/platform default (often utf-8)

Answer

ascii

Answer

utf-16

Answer

latin-1

Question 7

Which statement about binary mode ('rb') is TRUE?

Accepted Answer

Data is returned as bytes objects

Answer

Newlines are automatically converted

Answer

Data is returned as str objects

Answer

The file must already contain binary data