why just an augmented assignment statement in python code breaks it?

why this python code runs normally although the output is incorrect

low = 1
high = 1000

print(f"I will guess a value from {low} and {high}"
      "press 'h' or 'l' or 'c'for complete anything else to exit")

guesses = 1 
while True:
    mid = low + (high - low) // 2  
    print("is this is your guess {}".format(mid))
    inp = input()
    if inp == 'h':
        low += 1

    elif inp =='l':
        high -= 1

    elif inp == 'c':
        print('got it')

    else:
        break

but when i add just this line of code it says invalid syntax and breaks

low = 1
high = 1000

print(f"I will guess a value from {low} and {high}"
      "press 'h' or 'l' or 'c'for complete anything else to exit")

guesses = 1 
while True:
    mid = low + (high - low) // 2  
    print("is this is your guess {}".format(mid))
    inp = input()
    if inp == 'h':
        low += 1

    elif inp =='l':
        high -= 1

    elif inp == 'c':
        print('got it')

    guesses += 1
    else:
        break

so why guesses += 1 just breaks everything it is just a counter it does not have any role in the code except count for how many times i looped

• if you can also tell me why this code doesn't print print predicted values will be appreciated the program is supposed to be a binary search program .