You could use max() like this:
playerOnePoints = max(0, playerOnePoints - 5)
playerTwoPoints = max(0, playerTwoPoints - 5)
EDIT:
This answers your question, but your code is totally broken, here a working code:
import time
import random
total_score1 = 0
total_score2 = 0
rounds = 0
def start_round():
global total_score1
global total_score2
global rounds
rounds = rounds + 1
# First player rolls dice
number = random.randint(1,6)
number2 = random.randint(1,6)
playerOnePoints = number + number2
print("-------------------------------------------")
print("Round",rounds)
print("-------------------------------------------")
print("Player 1's turn Type 'roll' to roll the dice")
userOneInput = input(">>> ")
if userOneInput == "roll":
time.sleep(1)
print("Player 1's first roll is", number)
print("Player 1's second roll Type 'roll' to roll the dice")
userOneInput = input(">>> ")
if userOneInput == "roll":
time.sleep(1)
print("player 1's second roll is", number2)
if playerOnePoints % 2 == 0:
playerOnePoints = playerOnePoints + 10
print("Player 1's total is even so + 10 points")
else:
playerOnePoints = max(0, playerOnePoints - 5)
print("player 1's total is odd so -5 points")
total_score1 += playerOnePoints
print("-------------------------------------------")
print("Player 1 has", total_score1, "points")
# Second player rolls dice
number = random.randint(1,6)
number2 = random.randint(1,6)
playerTwoPoints = number + number2
print("-------------------------------------------")
print("Player 2's turn Type 'roll' to roll the dice")
userTwoInput = input(">>> ")
if userTwoInput == "roll":
time.sleep(1)
print("Player 2's first roll is", number)
print("Player 2's second roll Type 'roll' to roll the dice")
userTwoInput = input(">>> ")
if userTwoInput == "roll":
time.sleep(1)
print("player 2's second roll is", number2)
if playerTwoPoints % 2 == 0:
playerTwoPoints = playerTwoPoints + 10
print("Player 2's total is even so + 10 points")
else:
playerTwoPoints = max(0, playerTwoPoints - 5)
print("player 2's total is odd so -5 points")
total_score2 += playerTwoPoints
print("-------------------------------------------")
print("Player 2 has", total_score2, "points")
print("-------------------------------------------")
print("Welcome to dice game!")
print("-------------------------------------------")
max_rounds = int(input("Please enter number of rounds: "))
while rounds < max_rounds:
start_round()
print("-------------------------------------------")
print("End of game")
print("-------------------------------------------")
print("Player 1 has", total_score1, "points")
print("Player 2 has", total_score2, "points")
if total_score1 == total_score2:
print("It's a tie!")
else:
print(f"Player {1 if total_score1 > total_score2 else 2} wins!")
It is not clear if you want the total score to be the sum of dices plus 10 or minus 5 either if the sum is pair or impair, but I did it that way.
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