Checking if the user is IDLE

[snippsat]

Can use Timer from threading.
Your indentation is mixed,it's always 4-space.
PEP-8 eg function is lowercase,underscores for longer names.
Example:

from threading import Timer
import time, sys
import random

def dice():
    dice = random.randint(1, 6)
    dice2 = random.randint(1, 6)
    return(dice, dice2)

def start(timeout, dice):
    t = Timer(timeout, print, ['\nSorry, times up <Enter to exit>'])
    t.start()
    dice_trow = dice()
    print(f"Your Dice rolls are {dice_trow }")
    user_input = input(f"What's the sum,You have {timeout} seconds to answer: ")
    t.cancel()
    try:
        if int(user_input) == sum(dice_trow):
            print(f'Correct the sum was {sum(dice_trow )}')
        else:
            print(f'{user_input} is wrong,corrcet was {sum(dice_trow )}')
    except ValueError:
        pass

if __name__ == '__main__':
    timeout = 5
    start(timeout, dice)

Test:

Output:
λ python time_out.py
Your Dice rolls are (2, 4)
What's the sum,You have 5 seconds to answer:
Sorry, times up <Enter to exit>

λ python time_out.py
Your Dice rolls are (3, 4)
What's the sum,You have 5 seconds to answer: 7
Correct the sum was 7

λ python time_out.py
Your Dice rolls are (2, 5)
What's the sum,You have 5 seconds to answer: 8
8 is wrong,corrcet was 7