Using both OR, AND in an IF-statement

def alarm_clock(day, vacation):
    if day == 0 or day == 6 and vacation != True:
        return "10.00"
    else: 
        return "off"

print(alarm_clock(0, True))

Why does this return "10.00"? In my mind it should return "off". Yes, day is equal to 0, but vacation is True, and the IF-statements first line states that it should only be executed if vacation is not True.

CodePudding user response：

In Python and binds tighter than or. So your statement is equivalent to this:

if day == 0 or (day == 6 and vacation != True):

To get the correct result you must parenthesize the precedence yourself:

if (day == 0 or day == 6) and vacation != True:

CodePudding user response：

What you probably want is this:

def alarm_clock(day, vacation):
    if (day == 0 or day == 6) and vacation != True:
        return "10.00"
    else: 
        return "off"

print(alarm_clock(0, True))