text: """Lab 1."""
  
  # Boolean Operators
  
  def both_positive(x, y):
      """Returns True if both x and y are positive.
  
      >>> both_positive(-1, 1)
      False
      >>> both_positive(1, 1)
      True
      """
      return x > 0 and y > 0 # You can replace this line!
  
  
  # If Statements
  
  def xk(c, d):
      if c == 4:
          return 6
      elif d >= 4:
          return 6 + 7 + c
      else:
          return 25
  
  def how_big(x):
      if x > 10:
          print('huge')
      elif x > 5:
          return 'big'
      elif x > 0:
          print('small')
      else:
          print("nothin'")
  
  def so_big(x):
      if x > 10:
          print('huge')
      if x > 5:
          return 'big'
      if x > 0:
          print('small')
      print("nothin'")
  
  
  # Guessing Games
  
  from random import randint
  
  LOWER = 1
  UPPER = 10
  
  def guess_random():
      """Guess randomly and return the number of guesses."""
      prompt_for_number(LOWER, UPPER)   # asks the user to choose a number
      num_guesses, correct = 0, False
      while not correct:
          guess = randint(LOWER, UPPER) # randomly guess
          correct = is_correct(guess)   # ask user if guess is correct
          num_guesses = num_guesses + 1
      return num_guesses
  
  def guess_linear():
      """Guess in increasing order and return the number of guesses."""
      prompt_for_number(LOWER, UPPER)
      num_guesses, correct = 1, False
      guess = LOWER
      "*** YOUR CODE HERE ***"
      while not is_correct(guess) and guess <= UPPER:
          guess = guess + 1
          num_guesses = num_guesses + 1
      return num_guesses
  
  def guess_binary():
      """Return the number of attempted guesses. Implement a faster search
      algorithm that asks the user whether a guess is less than or greater than
      the correct number.
  
      Hint: If you know the guess is greater than the correct number, then your
      algorithm doesn't need to try numbers that are greater than guess.
      """
      prompt_for_number(LOWER, UPPER)
      num_guesses = 1
      lower, upper = LOWER, UPPER
      guess = (lower + upper) // 2
      while not is_correct(guess):
          num_guesses = num_guesses + 1
          if is_too_high(guess):
              upper = guess - 1
          else:
              lower = guess + 1
          if lower <= upper:
              guess = (lower + upper) // 2
          else:
              break
          
      return num_guesses
  
  # Receive user input. You do not need to understand the code below this line.
  
  def prompt_for_number(lower, upper):
      """Prompt the user for a number between lower and upper. Return None."""
      is_valid_number = False
      while not is_valid_number:
          # You don't need to understand the following two lines.
          number = input('Pick an integer between {0} and {1} (inclusive) for me to guess: '.format(lower, upper))
          number = int(number)
          if lower <= number <= upper:
              is_valid_number = True
  
  def is_correct(guess):
      """Ask the user if a guess is correct and return whether they respond y."""
      return is_yes('Is {0} your number? [y/n] '.format(guess))
  
  def is_too_high(guess):
      """Ask the user if a guess is too high and return whether they say yes."""
      return is_yes('Is {0} too high? [y/n] '.format(guess))
  
  def is_yes(prompt):
      """Ask the user a yes or no question and return whether they say yes."""
      while True: # This while statement will loop until a "return" is reached.
          yes_no = input(prompt).strip()
          if yes_no == 'y':
              return True
          elif yes_no == 'n':
              return False
          print('Please type y or n and press return/enter')
  
  