44 lines
1.1 KiB
Python
44 lines
1.1 KiB
Python
"""
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Takes user input.
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"""
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import sys
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def query_yes_no(question, default="yes"):
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"""Ask a yes/no question via raw_input() and return their answer.
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"question" is a string that is presented to the user.
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"default" is the presumed answer if the user just hits <Enter>.
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It must be "yes" (the default), "no" or None (meaning
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an answer is required of the user).
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The "answer" return value is one of "yes" or "no".
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"""
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valid = {
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"yes": True,
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"y": True,
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"ye": True,
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"no": False,
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"n": False,
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}
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if default is None:
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prompt = " [y/n] "
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elif default == "yes":
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prompt = " [Y/n] "
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elif default == "no":
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prompt = " [y/N] "
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else:
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raise ValueError("invalid default answer: '%s'" % default)
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while True:
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sys.stdout.write(question + prompt)
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choice = input().lower()
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if default is not None and choice == '':
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return valid[default]
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elif choice in valid:
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return valid[choice]
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else:
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sys.stdout.write("Please respond with 'yes' or 'no' (or 'y' or 'n').\n")
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