qiskit/transpiler/layout.py
def add(self, virtual_bit, physical_bit=None):
        """
        Adds a map element between `bit` and `physical_bit`. If `physical_bit` is not
        defined, `bit` will be mapped to a new physical bit (extending the length of the
        layout by one.)
        Args:
            virtual_bit (tuple): A (qu)bit. For example, (QuantumRegister(3, 'qr'), 2).
            physical_bit (int): A physical bit. For example, 3.
        """
        if physical_bit is None:
            physical_candidate = len(self)
            while physical_candidate in self._p2v:
                physical_candidate += 1
            physical_bit = physical_candidate
        self[virtual_bit] = physical_bit
def add(self, virtual_bit, physical_bit=None):
        """
        Adds a map element between `bit` and `physical_bit`. If `physical_bit` is not
        defined, `bit` will be mapped to a new physical bit (extending the length of the
        layout by one.)
        Args:
            virtual_bit (tuple): A (qu)bit. For example, (QuantumRegister(3, 'qr'), 2).
            physical_bit (int): A physical bit. For example, 3.
        """
        if physical_bit is None:
            physical_candidate = len(self)
            while physical_candidate in self._p2v:
                physical_candidate += 1
            physical_bit = physical_candidate
        self[virtual_bit] = physical_bit
def add ( self , virtual_bit , physical_bit = None ) : if physical_bit is None : physical_candidate = len ( self ) while physical_candidate in self . _p2v : physical_candidate += 1 physical_bit = physical_candidate self [ virtual_bit ] = physical_bit
Adds a map element between `bit` and `physical_bit`. If `physical_bit` is not
        defined, `bit` will be mapped to a new physical bit (extending the length of the
        layout by one.)
        Args:
            virtual_bit (tuple): A (qu)bit. For example, (QuantumRegister(3, 'qr'), 2).
            physical_bit (int): A physical bit. For example, 3.
Adds a map element between bit and physical_bit . If physical_bit is not defined bit will be mapped to a new physical bit ( extending the length of the layout by one . ) Args : virtual_bit ( tuple ) : A ( qu ) bit . For example ( QuantumRegister ( 3 qr ) 2 ) . physical_bit ( int ) : A physical bit . For example 3 .