Python File Input and Output 4

Question 1

Which io class should you use to work with in-memory text streams?

Accepted Answer

io.StringIO

Answer

io.StringIO provides an in-memory stream for text, implementing the same interface as a regular text file.

Question 2

What does pathlib.Path.write_text(data) do if the file already exists?

Accepted Answer

Overwrites the file with the new data

Answer

Path.write_text() opens the file in 'w' mode and overwrites any existing content with the provided text.

Question 3

Which method of pathlib.Path lists all immediate children of a directory?

Accepted Answer

Path.iterdir()

Answer

Path.iterdir() yields Path objects for all entries (files and directories) directly inside the directory.

Question 4

What does open(file, buffering=0) mean?

Accepted Answer

Disable buffering (only valid in binary mode)

Answer

Setting buffering=0 disables buffering; this is only permitted in binary mode and causes each read/write to go directly to the OS.

Question 5

What does shutil.copy2(src, dst) preserve that shutil.copy(src, dst) does not?

Accepted Answer

File metadata (timestamps)

Answer

shutil.copy2() copies content and permissions like copy(), but also preserves the file's metadata such as modification timestamps.

Python Practice Test