Python ask yesno

def ask_yesno(question):
    """
    Helper to get yes / no answer from user.
    """
    yes = {'yes', 'y'}
    no = {'no', 'n'}  # pylint: disable=invalid-name

    done = False
    print(question)
    while not done:
        choice = input().lower()
        if choice in yes:
            return True
        elif choice in no:
            return False
        else:
            print("Please respond by yes or no.") 

def Ask_YesNo(sQuestion, default="y"):
    sInput = input("{}(Now={}) (y/n): ".format(sQuestion, default))
    
    try: 
        if ""==sInput:
            return "y"==default.lower() or "yes"==default.lower()
        elif "y"==sInput.lower() or "yes"==sInput.lower(): 
            return True
        else:
            return False
    except ValueError:
        return False 

def ask_yesno(label, default="yes"):
    valid = {"yes": True, "y": True, "Y": True,
             "no": False, "n": False, "N": False}
    if default is None:
        prompt = " [y/n] "
    elif default == "yes":
        prompt = " [Y/n] "
    elif default == "no":
        prompt = " [y/N] "
    else:
        raise ValueError("invalid default answer: '%s'" % default)

    while True:
        sys.stdout.write(label + prompt)
        choice = raw_input().lower()
        if default is not None and choice == '':
            return valid[default]
        elif choice in valid:
            return valid[choice]
        else:
            sys.stdout.write("Invalid input\n") 

def ask_yesno(prompt):
  """
  Display the text prompt and let's the user enter a string.
  If the user enters "y", the function returns "True",
  and if the user enters "n", the function returns "False"
  If the user enters anything else, the function prints "I beg your pardon!",
  and asks again, repeating this until the user has entered a correct string.
  """
  
  while True :
    user_input = raw_input(prompt)
    
    if user_input == "y" :
      return True
    elif user_input == "n" :
      return False
    else :
      print "I beg your pardon!" 

def ask_yesno(msg="Proceed?", dft=None, **kwargs):
    """Prompts the user for a yes or no answer. Returns True for yes, False
    for no."""
    yes = ["y", "yes", "Y", "YES"]
    no = ["n", "no", "N", "NO"]
    if dft != None:
        dft = yes[0] if (dft in yes or dft == True) else no[0]
    return ask(msg, dft=dft, vld=yes+no) in yes 

def ask_yesno(question):
    ans = ""
    while True:
        ans = input(question + " [y/n] ")
        if ans == "y":
            return True
        elif ans == "n":
            return False