Source code for seismic.ASDFdatabase.query_input_yes_no

"""
From http://code.activestate.com/recipes/577058/
"""

import sys


def query_yes_no(question, default="yes"):
    """Ask a yes/no question via input() and return their answer.

    "question" is a string that is presented to the user.
    "default" is the presumed answer if the user just hits <Enter>. \
        It must be "yes" (the default), "no" or None (meaning \
        an answer is required of the user).

    The "answer" return value is one of "yes" or "no".
    """
    valid = {"yes": "yes", "y": "yes", "ye": "yes",
             "no": "no", "n": "no"}
    if default == None:
        prompt = " [y/n] "
    elif default == "yes":
        prompt = " [Y/n] "
    elif default == "no":
        prompt = " [y/N] "
    else:
        raise ValueError("invalid default answer: '%s'" % default)

    from builtins import input
    while 1:
        sys.stdout.write(question + prompt)
        choice = input().lower()
        if default is not None and choice == '':
            return default
        elif choice in valid.keys():
            return valid[choice]
        else:
            sys.stdout.write("Please respond with 'yes' or 'no' " \
                             "(or 'y' or 'n').\n")