python - How to repeat loop until a valid answer is given? -


this question has answer here:

so coded function takes value of batteries variable. want if value "yes" or "no". if value none of these answers, want to ask again indefinite amount of times. here code in case description bad.

def batterie_answer():     batteries = raw_input("yes or no > ").lower()     print batteries     while true:         if batteries != "yes" or batteries != "no":             print "please respond yes or no"             raw_input("> ")             continue         elif batteries == "yes":             print "batteries taken!"             items["batteries"] = 1             break         elif batteries == "no":             print "probably wise choice. save space!"             break  batterie_answer()

you need move assignment inside while loop or add assignment. need change or and. need remove raw_input line not assign value batteries variable.

def batterie_answer():     while true:         batteries = raw_input("yes or no > ").lower()         print batteries         if batteries != "yes" , batteries != "no":             print "please respond yes or no"             continue         elif batteries == "yes":             print "batteries taken!"             items["batteries"] = 1             break         elif batteries == "no":             print "probably wise choice. save space!"             break  batterie_answer()

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