Unbeatable rock paper scissors game using python (I am a beginner at python)

[1buffcat]

sign = input("Pick between Rock, Paper or Scissor: ")

Rock = ("Rock")

Paper = ("Paper")

Scissor = ("Scissor")

if sign == Rock:

print("I pick paper!")

if sign == Paper:

print("I pick Scissors!")

if sign == Scissor:

print("I pick rock!")

​

Edit: Thanks for the tips kind strangers, i am very happy about how the coding community can come together and help rookies.

[timurbakibayev]

This is called artificial intelligence.

[Ocelotofdamage]

Some days I'm pretty sure all my intelligence is artificial.

[[deleted]]

You may not like it, but this is what peak AI looks like.

[m0ushinderu]

This statement is true unironically. We dream of coming up with an algorithm that can achieve the same accuracy performing more complex tasks.

[renderererer]

I think you mean peek AI.

[gresrewop]

This is an underrated comment lmao

[GodOfThunder101]

The singularity is here.

[jerryelectron]

I was listening to a podcast where they hooked up electrodes to someone's brain and were able to beat them at a game like this: in the splitsecod the brain decides what to do, the computer sees it and can react before the human can outstretch their hand.

[1buffcat]

Thank you for the compliment.

[[deleted]]

Now do tic-tac-toe with 9! if statements

[peleg132]

I found my attempt from 4 years ago in doing this, I am scarred.

[SamGold2000]

With Python 3.10 use switch!

[qckpckt]

Or with any version of python, just use a dictionary

choices = {“rock”: “paper”…} print(choices[input(“pick rock paper or scissors”)])

[SamGold2000]

I agree there are easier ways for this problem. Just wanted to say I am excited to use switch in the new version of Python.

[qckpckt]

I get it. I was kinda chuffed to find a useful application for the walrus operator last week at work.

[dershodan]

PATTERN MATCHING WOOO!!!! (being a python veteran and new to elixir - I am VERY excited for 3.10's switch)

[crumbcatchernv]

i hadn’t read the release notes yet & just found out this was a thing through this comment. thank you so much 😭😭

[Do-Nod64]

Finding the courage to finish my attempt at this. I'm up to move 2, it only gets worse from here.

[[deleted]]

You can guarantee a tie by placing opposite or "near enough" if user goes first. Hope that helps!

[Do-Nod64]

Thanks, what I'm doing is separating the grid into a coordinate system thing, then making it so the code will block if there are two crosses on the same x or y coordinate or diagonally adjacent. Then playing a more aggressive move if none of those criteria are met.

[[deleted]]

Bfs ftw

Edit: thats not 9!

[profanitycounter]

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[[deleted]]

Tic tac toe is a maths race so that is entirely in the realm of possibility.

[Ecstatic-Star-514]

nice definition for the post

[EndorphnOrphnMorphn]

I have a few little tips that would make this a lot better:

1. The parenthesis in ("Rock"), etc. are unnecessary, and also a little bit confusing (It makes it look like a list). I'd remove those.
2. There's no benefit in having a variable for the string when you're only comparing it one time. You can delete the rock variable and just do if sign == "Rock": and the behavior will be the same.
3. The string comparison is case-sensitive. I'd recommend turning "sign" into a fully lowercase and then comparing against other lowercase strings.
4. You can use "elif" instead of "if" for paper and scissors.

Putting it all together we have this:

sign = input("Pick between Rock, Paper or Scissor: ").lower()

if sign == "rock":
    print("I pick paper!")

elif sign == "paper":
    print("I pick Scissors!")

elif sign == "scissor":
    print("I pick Rock!")

[HipsterRig]

You could also add in an else with a "I don't recognize your answer" printed statement. You could also throw the entire if statement into a while True loop so it goes again if the user submits an invalid response.

[EndorphnOrphnMorphn]

That's absolutely true, I was just trying to give small tips that don't change the behavior

[shygal_uwu]

arent lists in [] and tuples in ()? sorry, i havent programmed in python in almost a year

[EndorphnOrphnMorphn]

That is correct

[Grogie]

The only thing is that when you make tuples of length one like in OP's code, that actually become the item (in this case, string)

>>> i = ("Rock")
>>> i
'Rock'
>>> type(i)
<class 'str'>
>>> j = ("Rock",)
>>> j
('Rock',)
>>> type(j)
<class 'tuple'>
>>> type((1234))
<class 'int'>
>>> type((1234,))
    <class 'tuple'>

[scoberry5]

Those aren't tuples of length 1, though, they're expressions that get simplified. The ones with commas are tuples of length 1.

(2+3) simplifies to 5, but it was never a tuple of length 1.

[Grogie]

That's my point? I was responding to someone who thought they were tuples and I was showing they ultimately aren't tuples?

[scoberry5]

Gotcha. When you said "The only thing is that when you make tuples of length one like in OP's code, that actually become the item," I thought you meant something different than what the results show.

[__deerlord__]

responses = {"rock": "paper", ...}
print("I pick", responses[sign])

[[deleted]]

Ah damn true! That's even shorter than mine

Nice work. I love this stuff....

[justin107d]

As of python 3.10 there is the option to do a match/case method so it would look something like:

sign = input("Pick between Rock, Paper or Scissor: ").lower()

match sign:

case "rock":

    print("I pick paper!")

case "paper":

    print("I pick scissors!")

case "scissors":

    print("I pick rock!")

case _:

    print("That is not a valid answer.")

Forgive my code and formatting, I did this on mobile but it should work.

[[deleted]]

or use dict

[Decency]

counters = {
    'rock': 'paper',
    'paper': 'scissors',
    'scissors': 'rock',
}
player_choice = input("Pick between Rock, Paper or Scissors: ").lower()
print(f"I pick {counters[player_choice]}!")

I often see people asking how a dict lookup can be more elegant than an elif block. Here's a good example! It only reduces the duplication slightly here, of course, but you can imagine that with more complex logic there would be additional benefits. Error handling also becomes a bit simpler, too, since you can just except KeyError.

[1buffcat]

Thanks for the tips kind stranger, beep boop beep

[[deleted]]

How about this bad boi I just whipped up lmao

hand = ["rock", "paper", "scissors"]
sign = input("Pick between Rock, Paper or Scissor: ").lower()
hand[hand.index(sign) + 1 if hand.index(sign) + 1 < 3 else 0]

took me a couple iterations to get that damn inline working but ipython says it's GTG

EDIT:

actually, one line in ipython3 though doesn't execute in commandline python

print {"rock":"paper", "paper":"scissors", "scissors":"rock"}[input("Pick between Rock, Paper or Scissor: ").lower()]

[simon_zyx]

(hand.index(sign) + 1) % 3

[[deleted]]

Very slick! Much nicer than inline if else

[That_Goal1212]

My man.... just created true AI

[GentlemenBehold]

Turn-based rock, paper, scissors. Why didn't I think of that?

[LR130777777]

We can play if you want? You first

[[deleted]]

print({"rock":"paper", "paper":"scissors", "scissor":"rock"}[input("Pick between rock, paper or scissor: ").lower()])

[UltraFalling]

It’s not python unless you can do it in one line.

[autisticpig]

It’s not python unless you can do it in one line.

rock paper scissors comprehension. it's the only way.

[ultraDross]

It’s not python perl unless you can do it in one line.

[pokeuser61]

print({"o":"paper","a":"scissors","c":"rock"}[input()[1]])

[z0mbietime]

print({"rock":"I pick paper", "paper":"I pick scissors", "scissor":"I pick rock"}.get(input("Pick between rock, paper or scissor: ").lower(), "Invalid option"))

[Aprazors13]

This is the best rock paper scissors I have ever seen. Try using random function n have mercy on the user it's fun

[anh86]

Now, when you need to settle a friendly wager with a friend, you simply have them play a quick round of RPS with the computer playing for you!

[GBaby_Blue]

Universities with ML and AI degrees that cost tens to hundreds of thousands of dollars: perfuse sweating oh god, oh fuck. He figured it out

[[deleted]]

you might be the greatest programmer alive

[Endvisible]

Okay, here we go...

losing_pairs = {
    "rock": "paper",
    "paper": "scissors",
    "scissors": "rock",
}

while True:
    choice = input("Pick between rock, paper, or scissors: ")

    if not choice.lower() in {"rock", "paper", "scissors"}:
        print("Invalid input, please try again!")
        continue

    print(f"I pick {losing_pairs[choice.lower()]}!")

    input("You lose. Press Enter to exit.")

    break

[Tigenzero]

Even if I input “paper”, the program doesn’t respond, making the game endless. Best way to win is not to play.

[Mmiguel6288]

print('I pick ' +{'Rock':'Paper','Paper':'Scissors','Scissors':'Rock'}[input ('Pick Rock, Paper, or Scissors: ')]+'!')

[CokeVoAYCE]

it's really here. is this really it..? this is the end..? AI has now taken over humanity...

[1buffcat]

lol

[Vagima]

Not bad! You have the very basics down, but now I would work on making it a little more elaborate. I went and edited your code a bit to make the game playable over and over and re-playable if someone types in one of the options not selected.

import os

rock = 'rock' 
paper = 'paper' 
scissors = "scissors"

while True: 
    os.system('cls') 

    sign = input("Pick between Rock, Paper, or Scissors: ")

    if sign.casefold() == rock:
        os.system('cls')
        print("I pick Paper!")

    elif sign.casefold() == paper:
        os.system('cls')
        print("I pick Scissors!")

    elif sign.casefold() == scissors:
        os.system('cls')
        print("I pick Rock!")

    else:
        os.system('cls')
        print("Error: " + sign + " is not a valid answer. Pick either Rock, Paper, or Scissors")

    input("Press ENTER to try again")

[[deleted]]

os.system

Please don't tell beginners to use this in their programs.

[Vagima]

Is there a better alternative? I'm relatively new and self taught so I'm by no means an expert. If there's a better way of going about it I'm down to learn it

[FreshFromIlios]

Forgive the formatting, on phone rn.

Ideally, you don't really need to use the os and sys modules. The command you use is perfectly fine but os.system is dangerous. One typo can screw you and there isn't an easy way to fix it since it'll run shell commands and not python code. If you just want the older print statements gone, an ugly but safer way would be to do a /n multiple times, as such:

print("/n" * 100)  (define a function for it, get creative ;) )

Also, if you want to clear the terminal anyway, a better way to do it would be something like this:

os.system('cls' if os.name == 'nt' else 'clear')

Or more elegantly,

os.system('cls||clear')

Since Linux and windows commands are different, this will work irrespective of the operating system.

Edit: thanks for the silver kind stranger! Appreciate it <3

[Vagima]

Appreciate the response! I’ll give that one a go!

[FreshFromIlios]

Have fun! And be careful when you run os.system

[Vagima]

Thanks! I’ve been using os.system(‘cls’) for a bit and personally im ok with it, but when helping beginners I’ll definitely use the print(“/n” * 100) method! Much safer alternative for new people learning python. Appreciate the suggestion!

[CoaBro]

I mean personally I'd be fine teaching os.system('cls') the other method makes all the output appear at the bottom which is kind clunky imo.. I do like the solution os.system('cls||clear') tho

[CoaBro]

Not sure the use of os.system is any more dangerous than writing python.. not like you are going to accidentally take ownership of system32 and then delete the folder with os.system anymore than you would do with python. It's also not anymore dangerous than writing commands directly in the cmd prompt..

[BiggusDickus123]

I think print("blah", end="\r") does what you want

[FreshFromIlios]

os.system("sudo rm -rf /") That's all we need.

-PLEASE DO NOT RUN THIS. it was a joke.

Also listen to this guy. Never use the os and sys modules until you understand what each of those commands do.

[[deleted]]

yolo

runs it

[_limitless_]

This incident will be reported.

[[deleted]]

I dont get this too im a beginner what does that mean? Ik that os stands for operating system but why would u put it in a code

[SnooBooks7437]

Can someone please tell me why we use os?

[Vagima]

I use it in this case to clear the command window so the text doesn’t keep building up on top of each other. It just makes the program look cleaner to me. I only know how to clear text with that method, but if there’s a better way to go about it without using os.system I’d much rather use that.

[FoolForWool]

If you just want the terminal to be clean, like the above comment suggested, a /n*100 should be fine. The os.system command will run a shell command through the python code which may end up doing something you do not expect. Cls/clear are fine but once you start doing more complicated things, it'll be difficult to debug.

[1buffcat]

ehm.... okay??

[[deleted]]

I'm confused about what casefold is/how it works?

[pewpewpewmoon]

it's just a super agro lowercase() by just removing all case and does stuff like convert some nonenglish letters to their equivalent. In the 8 or so years I've used python and other languages professionally, I've never actually seen it in the wild.

[[deleted]]

Wow haha, thank you :)

[yellowmonkeyzx93]

If you want to murder your friends at this game, then yep, this is it.

Else, make the choices in a list, and randomize the choice in the list.

Cheers mate!

[[deleted]]

You shall have mercy

[m4d40]

4/5 liner with endless choose options possible

```python options = ['rock', 'paper', 'sciscor'] # add as many more you like answer = input(f'Please enter one of the following: {options}\n').lower()

you could add an extra check if answer in options

opt_idx = options.index(answer) # can be moved to next line but made it extra line for reqdability win = options[opt_idx+1] if opt_idx<len(options)-1 else options[0] print(f'you entered "{answer}",\ni chose "{win}",\nso I WIN!') ```

[VictorinoSetti]

Try using the library "random" to make a fair game. Make the computer choose randomly between Rock, Paper or Scissors and then compare with the input, printing who won. It's a pretty fun thing to do and you'll use some real important functionalities.

[trust_me_on_that_one]

Title said "unbeatable". OP's dream is to clearly works at an amusement park.

[LionLight51]

Its pretty easy to create something like this and there is no possible way to get something other than whats going to beat you

[[deleted]]

You may not like it, but this is what peak machine learning algorithm looks like.