python simple help (NameError: name is not defined) - python-3.x

Question

Whenever I run this is get:
Traceback (most recent call last):
File "main.py", line 130, in <module>
while is_playing_cg:
NameError: name 'is_playing_cg' is not defined
I want the user to be able to press 1 or 2 to select which game mode to use and then once pressed it starts. I don't know why it's doing this. Whenever it's fixed it should run through just fine.
New edit
Now it just loops and says 1 or 2 over and over again.
import random
is_playing_cg = False
is_playing_hg = False
def game_select_screen():
#Game Select Screen
print("""
._________________________________.
| |
| ~ Welcome To Guess-A-Number ~ |
| ~~~ |
| ~ Press 1 OR Press 2 ~ |
| You ^ Guess | PC ^ Guess |
|_________________________________|""")
selecting = True
while selecting:
print()
game_mode = input("1 OR 2: ")
try:
int(game_mode)
except ValueError:
print("This is not a Number.")
else:
game_mode = int(game_mode)
if game_mode == 1:
is_playing_hg = True
elif game_mode == 2:
is_playing_cg = True
#Defining Random Number for human guess
def play_human_guess():
num = random.randint (1,10)
print()
print("Im Thinking of a Number 1 Through 10.")
print("You Have 3 Chances.")
chances = 3
game_fisnished = False
#Game is playing (Human Guesses)
while not game_fisnished:
guess = input("> Take A Guess: ")
#Accept only numbers
try:
int(guess)
except ValueError:
print("This is not a Number.")
else:
guess = int(guess)
if guess < num:
chances -=1
if chances == 0:
print()
print("Sorry You Guessed Too Many Times.")
game_fisnished = True
elif chances !=0:
print()
print("You Guessed Too Low. ("+str(chances)+") Chance(s) Remaining.")
elif guess > num:
chances -=1
if chances == 0:
print()
print("Sorry You Guessed Too Many Times.")
game_fisnished = True
elif chances !=0:
print()
print("You Guessed Too High. ("+str(chances)+") Chance(s) Remaining.")
else:
print()
print("Congradulations, You Won!")
game_fisnished = True
#Game Ended
def end():
print()
print("Thanks For Playing!")
#Setting up for computer guess
def play_computer_guess():
print()
print("Pick a Number 1 Through 10")
print("I Have 3 Chances to Guess Your Number.")
chances = 3
game_fisnished = False
#Game is playing (Computer Guess)
while not game_fisnished:
guess1 = input("Is your number 5?")
#Show Game Select Screen
game_select_screen()
while is_playing_cg:
#Start Game
selecting = False
play_computer_guess()
answer = input("""
Do You Want to Play Again? (y/n) : """)
if answer == "n":
is_playing_cg = False
while is_playing_hg:
#Start Game
selecting = False
play_human_guess()
answer = input("""
Do You Want to Play Again? (y/n) : """)
if answer == "n":
is_playing_hg = False
end()

Answer 1

The variable is_playing_cg is only available in the "block" that creates it.
Block is function / loop / if statement / etc.
In your program you need to initialize the variable globally so you can call them in multiple functions.
Good luck!

Answer 2

You are defining is_playing_cg inside of a conditional statement at the top of your code. So if that option is not selected, then when you get to the latter conditional statement, it has never heard of that variable.... and it is not defined in the namespace. So you could either define it at the top and give it a default (False) or more better, because you only have 2 options, just use one variable to control the computer / human.
Here is a toy example:
selection = int(input('enter 1 for human, 2 for computer: '))
if selection == 1:
human_play = True
elif selection == 2:
human_play = False
else:
# make some loop that asks for input again or such...
pass
# later on...
if human_play:
# ask human for input...
else:
# have AI make turn
#if needed, you can also handle special cases like this:
if not human_play:
# do something unique to computer turn ...
Additional info...
So you got bit by the scope of the variables in your update. You are defining these variables inside of a function and when you put the defaults outside of the function, they are not in the same scope, so whatever you do inside the function is lost. So, you need to change your function into something that returns the mode you want, and catch that in the function call like such:
def ... :
# input ...
if game_mode == 1:
human_playing = True
selecting = False
elif game_mode == 2:
human_playing = False
selecting = False
return human_playing # this will return T/F back to the function call
And then later:
#Show Game Select Screen
human_playing = game_select_screen()
while not human_playing:
#Start Game
selecting = False
play_computer_guess()
answer = input("""
Do You Want to Play Again? (y/n) : """)
if answer == "n":
is_playing_cg = False
while human_playing:
#Start Game
This (above) works for me, but there are still other logic errors popping up! :) Have fun

Answer 3

This particular error is probably there because you have not defined is_playing_cg as global before using it in your function game_select_screen. Simply put global is_playing_cg at the start of your game_select_screen function to tell python you want to use the global variable instead of creating a scoped variable.