Victor Subervi wrote:
Hi;
I have the following:
style = raw_input('What style is this? (1 = short, 2 = long): ')
flag = 0
while flag == 0:
if (style != 1) or (style != 2):
style = raw_input('There was a mistake. What style is this? (1 =
short, 2 = long): ')
else:
flag = 1
I would think this would catch errors and permit valid values, but it
doesn't. If I enter an erroneous value the first time, and the second
time a good value, it doesn't break the loop. Why?
This is wrong:
(style != 1) or (style != 2)
For example, if style is 1 (which should be a valid value):
(style != 1) or (style != 2)
=> (1 != 1) or (1 != 2)
=> False or True
=> True
What you mean is:
(style != 1) and (style != 2)
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