A basic question about “while true”

0 votes

level: beginner

def play_game(word_list):

hand = deal_hand(HAND_SIZE)# random init

while True:

cmd = raw_input('Enter n to deal a new hand, r to replay the last hand, or e to end game: ')

if cmd == 'n':

hand = deal_hand(HAND_SIZE)

play_hand(hand.copy(), word_list)

print elif cmd == 'r':

play_hand(hand.copy(), word_list)

print elif cmd == 'e':

break else:

print "Invalid command."

my question: while WHAT is True?

i reckon saying 'while true' is shorthand but for what? while the variable 'hand' is being assigned a value? and what if the variable 'hand' is not being assigned a value?

Aug 8, 2018 in Python by Priyaj
• 56,140 points

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while True means loop forever. The while statement takes an expression and executes the loop body while the expression evaluates to (boolean) "true". True always evaluates to boolean "true" and thus executes the loop body indefinitely. It's an idiom that you'll just get used to eventually! Most languages you're likely to encounter have equivalent idioms.

Note that most languages usually have some mechanism for breaking out of the loop early. In the case of Python it's the break statement in the cmd == 'e' case of the sample in your question.

answered Aug 8, 2018 by bug_seeker
• 14,980 points

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