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Play with Docker and Python

ยท 6 min read
Christophe

Play with Docker and Python

Remember a few years ago when you wanted to learn a new programming language such as Python? What did you need before you could even start programming your first Hello World? You had to install the language on your computer; maybe you also had to get a lot of libraries/dependencies; you had to spend time configuring your machine before you could even start writing your first script.

That's all over with the advent of Docker and the concept of containers.

This time, we'll play with Python for this article. I'm discovering Python at the same time as writing this article: at this precise moment, I've never written .py scripts.

Welcome to the worldโ€‹

Please start a Linux shell and run mkdir -p /tmp/python && cd $_ to create a folder called python in your Linux temporary folder and jump in it.

Please create a new file called Hello.py with this content:

print ("Hello World!")

Ok, so now, how to run that script? Because I'm familiar with Docker, I know that:

  1. I need a Python Docker image (https://hub.docker.com/_/python),
  2. I'll need to use a docker run command line instruction,
  3. I'll need share my script using a volume and
  4. I need to know how to run the script.
โฏ docker run -it --rm -v ${PWD}:/app -w /app python python Hello.py

Hello World!

And voilร , my first Python script has been written. Remember the old days, before Docker, how many hours and how much reading did you need to be able to run your first script? Here, it didn't take me five minutes to get up and running.

Docker CLI reminder

As a reminder, the used Docker run command are (almost always the same):

  • -it to start Docker interactively, this will allow the script running in the container to ask you for some prompts f.i.,
  • --rm to ask Docker to kill and remove the container as soon as the script has been executed (otherwise you'll have a lot of exited but not removed Docker containers; you can check this by not using the --rm flag then running docker container list on the console),
  • -v ${PWD}:/app to share your current folder with a folder called /app in the Docker container,
  • -w /app to tell Docker that the current directory, in the container, will be the /app folder
  • then python which is the name of the Docker image to use (you can also specify a version like python:3.9.18 if needed; see https://hub.docker.com/_/python/tags) and, finally,
  • python Hello.py i.e. the command line to start within the container.

Playing the hangmanโ€‹

As said above, in November 2023, I don't have start to learn Python so let's try to find some sample scripts. On https://hackr.io/blog/python-projects, we can find a Hangman script.

Please create the Hangman.py file onto your disk with this content:

import random
import time
import os


def play_again():
question = 'Do You want to play again? y = yes, n = no \n'
play_game = input(question)
while play_game.lower() not in ['y', 'n']:
play_game = input(question)

if play_game.lower() == 'y':
return True
else:
return False


def hangman(word):
display = '_' * len(word)
count = 0
limit = 5
letters = list(word)
guessed = []
while count < limit:
guess = input(f'Hangman Word: {display} Enter your guess: \n').strip()
while len(guess) == 0 or len(guess) > 1:
print('Invalid input. Enter a single letter\n')
guess = input(
f'Hangman Word: {display} Enter your guess: \n').strip()

if guess in guessed:
print('Oops! You already tried that guess, try again!\n')
continue

if guess in letters:
letters.remove(guess)
index = word.find(guess)
display = display[:index] + guess + display[index + 1:]

else:
guessed.append(guess)
count += 1
if count == 1:
time.sleep(1)
print(' _____ \n'
' | \n'
' | \n'
' | \n'
' | \n'
' | \n'
' | \n'
'__|__\n')
print(f'Wrong guess: {limit - count} guesses remaining\n')

elif count == 2:
time.sleep(1)
print(' _____ \n'
' | | \n'
' | | \n'
' | \n'
' | \n'
' | \n'
' | \n'
'__|__\n')
print(f'Wrong guess: {limit - count} guesses remaining\n')

elif count == 3:
time.sleep(1)
print(' _____ \n'
' | | \n'
' | | \n'
' | | \n'
' | \n'
' | \n'
' | \n'
'__|__\n')
print(f'Wrong guess: {limit - count} guesses remaining\n')

elif count == 4:
time.sleep(1)
print(' _____ \n'
' | | \n'
' | | \n'
' | | \n'
' | O \n'
' | \n'
' | \n'
'__|__\n')
print(f'Wrong guess: {limit - count} guesses remaining\n')

elif count == 5:
time.sleep(1)
print(' _____ \n'
' | | \n'
' | | \n'
' | | \n'
' | O \n'
' | /|\\ \n'
' | / \\ \n'
'__|__\n')
print('Wrong guess. You\'ve been hanged!!!\n')
print(f'The word was: {word}')

if display == word:
print(f'Congrats! You have guessed the word \'{word}\' correctly!')
break


def play_hangman():
print('\nWelcome to Hangman\n')
name = input('Enter your name: ')
print(f'Hello {name}! Best of Luck!')
time.sleep(1)
print('The game is about to start!\nLet\'s play Hangman!')
time.sleep(1)
os.system('cls' if os.name == 'nt' else 'clear')

words_to_guess = [
'january', 'border', 'image', 'film', 'promise', 'kids',
'lungs', 'doll', 'rhyme', 'damage', 'plants', 'hello', 'world'
]
play = True
while play:
word = random.choice(words_to_guess)
hangman(word)
play = play_again()

print('Thanks For Playing! We expect you back again!')
exit()


if __name__ == '__main__':
play_hangman()

Then, run it using docker run -it --rm -v ${PWD}:/app -w /app python python Hangman.py and good luck:

Hangman Word: ______ Enter your guess:
A
_____
|
|
|
|
|
|
__|__

Wrong guess: 4 guesses remaining

Hangman Word: ______ Enter your guess:
E
_____
| |
| |
|
|
|
|
__|__

Wrong guess: 3 guesses remaining

Hangman Word: ______ Enter your guess:
I
_____
| |
| |
| |
|
|
|
__|__

Wrong guess: 2 guesses remaining

Hangman Word: ______ Enter your guess:
C
_____
| |
| |
| |
| O
|
|
__|__

Wrong guess: 1 guesses remaining

Hangman Word: ______ Enter your guess:
O
_____
| |
| |
| |
| O
| /|\
| / \
__|__

Wrong guess. You've been hanged!!!

The word was: border
Do You want to play again? y = yes, n = no

Damned, I lost.

It's up to you to find out... You'll find a script that will test the strength of a password; it's up to you to create the check_password.py script and run it on your machine.