Conditionals and Flow Control (Codecademy Python 9/15)

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Conditionals and Flow Control (Codecademy Python 9/15)

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#1 by (4 votes)

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Hello, I'm doing a codecademy exercise and I have to solve the following conditional ones:

Equal bool_one to False result or not True and True
Equal bool_two to False result and not True or True
Equals bool_three to the result of True and not (False or False)
Equal bool_four to the result of not True or False and not True
Equal bool_five to the result of False or not (True and True)

Here are my answers:

bool_one = False
bool_two = False
bool_three = True
bool_four = True
bool_five = False

But the validator of the exercise is indicating that one or more answers are wrong.

python

asked by anonymous 25.09.2015 / 14:03

1 answer

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score 4 · Answer 1

Your error is in the second item, which is this:

Equal bool_two to False result and not True or True

Running the code:

print False and not True or True

You will have as a result:

True

Looking at the precedence table in Python Docs - Expressions you will see that not has higher precedence among the operators of this expression, and and has the second highest precedence, being executed before or but after not . Therefore the compiler does the following calculations:

not True = > False
False and False = > False
False or True = > True (end result)

When making a testo and giving greater precedence to or you can see that the result is False . Example:

print False and not (True or True)

Result:

False