Writing multiple lines in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

How do you write multiple lines of text to a file in Python?

You can open a file in write mode and use a loop or write a list of lines using writelines() method.

beginner

What does the with statement do when writing to a file?

It automatically opens the file and closes it after the block finishes, even if errors happen. This helps avoid forgetting to close the file.

beginner

How can you write multiple lines using a loop?

You can loop over a list of strings and write each line with file.write(line) inside the loop.

intermediate

What is the difference between write() and writelines()?

write() writes a single string. writelines() writes a list of strings but does not add newlines automatically.

beginner

Why should you add newline characters when writing multiple lines?

Because writelines() does not add newlines, you must add \n at the end of each line to separate lines in the file.

Which Python statement ensures a file is properly closed after writing multiple lines?

A with open(filename, 'w') as file:

B open(filename, 'w')

C file.close()

D write(filename)

The with statement opens the file and automatically closes it after the block.

What does writelines() do when writing multiple lines?

A Adds newlines automatically between lines

B Writes a list of strings without adding newlines

C Writes a single string with newlines

D Closes the file after writing

writelines() writes all strings in the list as is, so you must add newlines yourself.

How do you add a newline after each line when writing multiple lines with a loop?

A Add '\n' at the end of each string

B Use <code>write()</code> without changes

C Use <code>writelines()</code> only

D Call <code>file.newline()</code>

You must add '\n' to each string to create new lines in the file.

Which mode should you use to write multiple lines to a new file?

A 'a' mode

B 'r' mode

C 'w' mode

D 'x' mode

'w' mode opens the file for writing and creates it if it doesn't exist.

What happens if you forget to close a file after writing multiple lines?

A Nothing happens

B File is deleted

C File opens automatically next time

D Data may not be saved properly

Not closing a file can cause data loss because buffers may not flush to disk.

Explain how to write multiple lines to a file in Python using a loop and the with statement.

Think about opening the file safely and writing each line one by one.

Describe the difference between write() and writelines() when writing multiple lines.

Focus on how each method handles strings and newlines.