Python 2.7 if / elif statement with or -

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i'm new python i'm sure i'm doing wrong. defining function accepts string variable. can not sure variable be, there 3 values want test , return string if values found. if values not found, want return 'unknown'. here code: 

def item_priority(cell_color):   if cell_color == 'green' or 'yellow':     return 'low'   elif cell_color == 'red':     return 'high'   else:     return 'unknown'

so try execute:

>> item_priority('orange')

python returns:

'low'

the result expected see 'unknown'. if test "item_priority('red')", still returns 'low'. explanations have found on site far involve code more complex mine.

i have tried interchanging second 'if' 'elif' result still same. i'm not sure i'm doing wrong here. appreciated. thanks!

'yellow' evaluating true within if-conditional, therefore block of code being executed whatever pass in. need add or cell_color == 'yellow' line 2


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