Discover challenging Python brain teasers that test your skills and stretch your thinking. Gain insights into advanced concepts and enhance your understanding of this versatile language.

Forget Scrabble, Boggle, or Wordle. Tease your mind and test your skills with these fun brain teasers designed to stretch your thinking and expand your understanding of one of the most widely used languages out there. 

Python is simple. These puzzles are not. Good luck!

Python Brain Teasers

# Let's try it!
Try executing the code below to verify the result:

display = []
buttons = []
for n in range(10):
  # A button is a function called when user clicks on it
  buttons.append(lambda: display.append(n))

btn = buttons[3]
btn()
print(display)

# Explanation

Most people expect the correct answer to be `[3]` since each lambda appends its `n` to display. However, the `n` that each `lambda` uses is the same n defined in **line 3**. This type of variable binding is known as a **closure**.



Let’s find out how closure works in Python and how to fix this bug.

Before We Begin

Python Puzzles

Wrapping Up

Puzzle 11: Explanation

Let’s try it!

Explanation