def func():
    return False

if func:
    print('true')
else:
    print('false')

# true

if func():
    print('true')
else:
    print('false')

# false

class Test(object):
    def __init__(self):
        self._flag = False

    #here@I intended to add property but forgot to add it
    def flag(self):
        print('test flag')
        return self._flag
    
# ---

if __name__ == '__main__':
    test = Test()

    #I think it's a property, so call it without parentheses
    if test.flag:
        print('true')
    else:
        print('false')

# 'test flag'Is not printed
# 'true'Only printed

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