binary search

minNum = 0
midNum = 50
maxNum = 100
guess = "Is your secret number: "
print("Please think of a number between 0 and 100!")
print(guess + str(midNum) + "?")
request = 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. ")
while request != 'c':
    if  request == 'h':
        maxNum = midNum
        midNum = int((midNum + minNum)/2)
    elif request == 'l':
        minNum = midNum
        midNum = int((midNum + maxNum)/2)
    else:
        print("Sorry, I did not understand your input.")
    print(guess + str(midNum) + "?")
    request = 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 request == 'c':
    print("Game over. Your secret number was:" + str(midNum))