Python3.x if 语句中冒号的语法错误

我是python新手，我正在制作一种游戏，作为我的第一个项目之一，猜测1到10之间的数字，然后用户猜出来.他们有三次猜测，程序会告诉用户下一次猜测是需要更高还是更低.代码中出现错误的部分并不重要，因为如果用户两次输入相同的答案，只会使猜测不会被浪费，允许他们第一次重复猜测，但不允许第二次重复.在代码上，我标记了问题所在.就像我说的，我对python真的很陌生，这可能是一些业余的noobie错误.提前谢谢.

import time # This imports the time module.
import random # This imports the random module.

MyNumber = random.randrange(1,10) # This picks a number for the variable 'MyNumber'

firstGuess = int(input('Ok then, we shall begin! What is your first guess?'))
print()
if firstGuess == (MyNumber):
 print('Well done! You win!')
 time.sleep(3)
 exit()
if firstGuess < MyNumber:
 print('Go Higher!')
 time.sleep(1)
if firstGuess > MyNumber:
 print('Go Lower!')
 time.sleep(1)

print()
secondGuess = int(input('Better luck this time! What is your second guess?'))
print()
if secondGuess == firstGuess:
 print('You tried that one last time! Don\'t worry, I won\'t count that one!')
 bungled = (1)
 secondGuess = int(input('What is your second guess?')
 if secondGuess == firstGuess:  # This colon is causing the problem. <===========
  print('You\'ve already tried that one twice!')
  bungled = (2)
if secondGuess == MyNumber:
 print('Well done! You win!')
 time.sleep(3)
 exit()
if secondGuess < MyNumber:
 print('Go Higher!')
 time.sleep(1)
if secondGuess > MyNumber:
 print('Go Lower!')
 time.sleep(1)

print()
thirdGuess = int(input('This is your final chance! What is your third guess?'))
print()
if thirdGuess == MyNumber:
 print('Well done! You win!')
 time.sleep(3)
 exit()
if thirdGuess < MyNumber:
 MyNumber = str(MyNumber)
 print('Sorry! You lost! The number was '+MyNumber)
 time.sleep(1)
 exit()
if thirdGuess > MyNumber:
 MyNumber = str(MyNumber)
 print('Sorry! You lost! The number was '+MyNumber)
 time.sleep(1)
 exit()