Bisection search game

I'm starting to learn Python and am trying to optimize this bisection search game.

high = 100
low = 0
guess = (high + low)/2  

print('Please think of a number between 0 and 100!')

guessing = True
while guessing:
    print('Is your secret number ' + str(guess) + '?')
    pointer = raw_input("Enter 'h' to indicate the guess is too high. Enter 'l'   to   indicate the guess is too low. Enter 'c' to indicate I guessed correctly.")
    if pointer == 'h':
        high = guess
        guess = (low + guess)/2

    elif pointer == 'l':
        low = guess
        guess = (high + guess)/2

    elif pointer == 'c':
        guessing = False

    else:
        print('Sorry, I did not understand your input.')
print('Game over. Your secret number was: ' + str(guess))

Some things I think would improve your code, which is quite correct:

• Having variables for high and low, you shouldn't hard code their values in the opening print.

• You should use // to make sure you are getting integer division.

• You can write guess = (low + high) // 2 only once, if you place it as the first line inside the while loop.

• When checking for pointer, you may want to first convert it to lower case, to make sure both h and H are understood.

• Make your code conform to PEP8 on things like maximum line length.

• Using the format method of str can make more clear what you are printing.

Putting it all together:

high, low = 100, 0

print('Please think of a number between {0} and {1}!'.format(low, high))

guessing = True
while guessing:
    guess = (low + high) // 2
    print('Is your secret number {0}?'.format(guess))
    pointer = raw_input("Enter 'h' to indicate the guess is too high. "
                        "Enter 'l' to indicate the guess is too low. "
                        "Enter 'c' to indicate I guessed correctly.").lower()
    if pointer == 'h' :
        high = guess
    elif pointer == 'l' :
        low = guess
    elif pointer == 'c':
        guessing = False
    else:
        print('Sorry, I did not understand your input.')

print('Game over. Your secret number was {0}.'.format(guess))

StackExchange Code Review Q#22984, answer score: 8