FIRST, A CORRECTION TO THE OR CONDITIONAL:
You need to say:
if x == 0 or y == 0 or z == 0:
The reason is that "or" splits up the condition into separate logical parts. The way your original statement was written, those parts were:
x
y
z == 0 // or 1, 2, 3 depending on the if statement
The last part was fine --- checking to see if z == 0, for instance --- but the first two parts just said essentially if x and if y. Since integers always evaluate to True unless they're 0, that means the first part of your
condition was always True when x or y didn't equal 0 [which in the case of y was always, since you had y = 1, causing your whole condition [because of how OR works] to always be True.
To avoid that, you need to make sure all parts of your condition [each side of the OR] make sense on their own [you can do that by pretending that the other side[s] of the OR statement doesn't exist]. That's how you can confirm whether or not your OR condition
is correctly defined.
You would write the statements individually like so:
if x == 0
if y == 0
if z == 0
which means the correct mergin with the OR keyword would be:
if x == 0 or y == 0 or z == 0
SECOND, HOW TO SOLVE THE PROBLEM:
You're basically wanting to check to see if any of the variables match a given integer and if so, assign it a letter that matches it in a one-to-one mapping. You want to do that for a certain list of integers so that the output is a list of letters. You'd do that like this:
def func[x, y, z]:
result = []
for integer, letter in zip[[0, 1, 2, 3], ['c', 'd', 'e', 'f']]:
if x == integer or y == integer or z == integer:
result.append[letter]
return result
Similarly, you could use LIST COMPREHENSION to achieve the same result faster:
def func[x, y, z]:
return [
letter
for integer, letter in zip[[0, 1, 2, 3], ['c', 'd', 'e', 'f']]
if x == integer or y == integer or z == integer
]
- What are the Python comparison operators used for?
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What are the Python comparison operators used for?
Comparison operators also known as relational operators are used to comparing values of two operands. Depending on the condition being tested, comparison operators may return True or False.
Python comparison operators can be used together with the if statement to form different logic to compare different values. For example, we can use comparison operators to determine if one value is equal to, greater than, less than or not equal to another value.
Python has six types of comparison operators as we would see shortly that can be used to compare both numeric types and strings as well. These operators include the greater than, less than, greater than or equal to, less than or equal to, not equal to and equal to operators.
Equal to Operator [==]
The Python equal to operator is used to determine if values on both sides of the operator are equal. The operator returns True if the values are equal and False if that is not the case.
In the short example below the operator returns False since the variables are not equal.
Not Equal to Operator[!=]
The not equal to Python comparison operator returns True if the values are not equal to one another and False if the values are equal to one another. Using variables from our earlier example the not equal to operator should return True since the values are indeed not equal to one another.
Greater than Operator [>]
The greater than operator allows you to check if the value on the left is greater than that on the right side of the operator. If the value of the left side is greater than that on the right, a True value is returned otherwise a False value is returned.
Less than operator [=]
This comparison operator returns True if the value on the left of the operator is equal to or greater than that on the left. A False value is returned if the value on the left is neither equal to nor greater than that on the right.