We want to design a robot that can choose a lower case letter from the alphabet randomly. Then the user needs to guess which letter the robot has chosen. Like this:
Please guess my chosen letter: g You are wrong! Try again! Please guess my chosen letter: k Great! You are right!
Solution with while loop. The event ending the loop is having guessed the right letter.
#02Loops example_07 GuessLetter.py
import random
alphabet = 'abcdefghijklmnopqrstuvwxyz' #Initialize the alphabet
answer = random.choice(alphabet) #Pick up a letter randomly
guess = raw_input('Please guess my letter: ') #Ask the user to guess
while guess != answer: #If the user's answer is not right, repeat the statements
print('You are wrong! Try again!')
guess = raw_input('Please guess my letter: ')
print('Great! Your are right!')
To help the user guess the right answer faster, we add a hint when the guess is wrong. The following is the revised code giving a hint:
# 02Loops example_07 GuessLetterWithHint.py
# with hint on whether guessed letter is too high ot too low
import random
alphabet = 'abcdefghijklmnopqrstuvwxyz' #Initialize the alphabet
answer = random.choice(alphabet) #Pick up a letter randomly
guess = raw_input('Please guess my letter: ') #Ask the user to guess
while guess != answer: #If the user's answer is not right, repeat the statements
if guess > answer: #If the user抯 answer is not right, provide hints.
print('My letter is before your guess in the alphabet')
else:
print('My letter is after your guess in the alphabet')
guess = raw_input('Please guess my letter: ')
print('Great! Your are right!')
This code above is an example of what is known as binary search.
