parameters: (self, serial_number)
return_statement: return None
docstring: Find virtual serial port based on serial number exact match
          returns: Name of virtual serial port or None.
docstring_summary: Find virtual serial port based on serial number exact match
          returns: Name of virtual serial port or None.
docstring_tokens: Find virtual serial port based on serial number exact match returns : Name of virtual serial port or None .
function: def find_serial_port(self, serial_number):
          """
          Find virtual serial port based on serial number exact match
          returns: Name of virtual serial port or None.
          """
          for item in self.portmap:
              if item["tool"].serial_number == serial_number:
                  return item["port"]
          return None
function_tokens: def find_serial_port ( self , serial_number ) : for item in self . portmap : if item [ "tool" ] . serial_number == serial_number : return item [ "port" ] return None