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:

from threading import Thread
from time import sleep


def printer():
    for i in range(3):
        print(i, end=' ')
        sleep(0.1)


thr = Thread(target=printer, daemon=True)  # <label id="code.daemon"/>
thr.start()
print()  # Add newline

## Explanation

In line 11, we start a daemon thread. Here’s what Python documentation has to say about daemon threads: “The entire Python program exits when no alive non-daemon threads are left.”  
 
Since there are no more non-daemon threads running after the `print()` line, the process will `exit`. The `printer` object will manage to print the first number (`0`). Then, the program will `exit`, taking the thread down with it.
If our Python program has finished working but seems to be “stuck,” it’s most likely because a non-daemon thread is running loose somewhere.


### Solution

If we want to wait for a thread to terminate, we can use the thread’s `join` method.

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

# Explanation

In line 11, we start a daemon thread. Here’s what Python documentation has to say about daemon threads: “The entire Python program exits when no alive non-daemon threads are left.”  
 
Since there are no more non-daemon threads running after the `print()` line, the process will `exit`. The `printer` object will manage to print the first number (`0`). Then, the program will `exit`, taking the thread down with it.
If our Python program has finished working but seems to be “stuck,” it’s most likely because a non-daemon thread is running loose somewhere.


## Solution

If we want to wait for a thread to terminate, we can use the thread’s `join` method.

Let’s find out how threading works in Python.

Before We Begin

Python Puzzles

Wrapping Up

Puzzle 5: Explanation

Let’s try it!

Explanation