Upgrade your python skills by solving puzzles.

Pythonic Style of Programming: Tips and Tricks

This module will test our skills with fun brain teasers designed to stretch our thinking and expand our 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 try it!
Try executing the code below to verify the result:

# 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.

Python Puzzles

Conclusion

Puzzle 11: Explanation

Let’s try it!

Explanation