AttributeError: object has no attribute thrown even though an attribute is implicitly given

Not sure why the following code throws the error AttributeError: 'CANManager' object has no attribute bus:

class CANManager():
  def __init__(self, name="can0", bitrate=500000, data_bitrate=2000000, fd=False):
    self.bus_name = name
    self.connect(fd)

  def connect(self, fd: bool):
    if fd is False:
      self.bus = can.interface.Bus(channel=self.bus_name, bustype='socketcan')
    elif fd is True:
      self.bus = can.interface.Bus(channel=self.bus_name, bustype='socketcan')
    return True

The self.connect(fd) should initialize bus in the constructor, shouldn't it?

There is nothing wrong with the above class.

The issue was that the fixture using this class was getting the fd boolean value from pytest.ini; which was set to the string "False":

@pytest.fixture(scope="session")
def can0(options, pytestconfig):
  logging.getLogger('can').setLevel(logging.WARNING)
  can_manager = CANManager(name=options.get('can_a'), 
                           bitrate=int(options.get('can_a_bitrate')),
                           fd=bool(options.get('can_fd_enable')))

    yield can_manager
    
    can_manager.disconnect()

So as shown above the fd parameter needed to be cast as a fd=bool(options.get('can_fd_enable')) so that the if statements in the connect definitions could be triggered. Python by default uses type declaration string so setting this variable in pytest.ini

can_fd_enable = False

Is setting it to the string False