Terminal keeps saying there’s something wrong with line 20, “SyntaxError: invalid syntax”.
I spent almost an hour trying to figure out what’s wrong with my code. Could it be a bug? Or maybe something’s wrong with my browser?
UPDATE: I just looked at my own code on Github, it shows on the site that some of the “elif” statements are wrongly indented, however, I assure you every thing is properly formatted on the code editor that I was working on. I guess maybe it’s a bug? -_-
bug in your code.
looking at this part of your code:
if user_choice == computer_choice:
print(message["tie"])
elif user_choice == options[0] and computer_choice == options[2]:
print(message["won"])
elif user_choice == options[1] and computer_choice == options[0]:
print(message["won"])
elif user_choice == options[2] and computer_choice == options[1]:
print(message["won"])
else:
print(message["lost"])
your if, first elif and else are indented fine. Why the second and third elif are not properly indented is a mystery to me. You seem to understand the concept fine 
the editor uses hard tabs, sometimes that causes indention problems although it looks fine.
Just re-indent around those lines
I would just set up a text-editor (like atom) with soft tab, and let the text-editor re-indent the whole things
Ah. It works now. Thanks! 
here is the code with soft tab (4 spaces, according to pep8 recommendations):
"""This is a Rock, Paper, Scissors game."""
from random import randint
options = ["ROCK", "PAPER", "SCISSORS"]
message = {
"tie": "Yawn it's a tie!",
"won": "Yay you won!",
"lost": "Aww you lost!"
}
def decide_winner(user_choice, computer_choice):
print("You selected: " + user_choice)
print("The Computer selected: " + computer_choice)
if user_choice == computer_choice:
print(message["tie"])
elif user_choice == options[0] and computer_choice == options[2]:
print(message["won"])
elif user_choice == options[1] and computer_choice == options[0]:
print(message["won"])
elif user_choice == options[2] and computer_choice == options[1]:
print(message["won"])
else:
print(message["lost"])
def play_RPS():
user_choice = raw_input("Enter Rock, Paper, or Scissor: ")
user_choice = user_choice.upper()
computer_choice = options[randit(0, 2)]
decide_winner(user_choice, computer_choice)
play_RPS()