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Edit File: __init__.py
#!/usr/bin/env python # # This is a wrapper module for different platform implementations # # This file is part of pySerial. https://github.com/pyserial/pyserial # (C) 2001-2020 Chris Liechti <cliechti@gmx.net> # # SPDX-License-Identifier: BSD-3-Clause from __future__ import absolute_import import sys import importlib from serial.serialutil import * #~ SerialBase, SerialException, to_bytes, iterbytes __version__ = '3.5' VERSION = __version__ # pylint: disable=wrong-import-position if sys.platform == 'cli': from serial.serialcli import Serial else: import os # chose an implementation, depending on os if os.name == 'nt': # sys.platform == 'win32': from serial.serialwin32 import Serial elif os.name == 'posix': from serial.serialposix import Serial, PosixPollSerial, VTIMESerial # noqa elif os.name == 'java': from serial.serialjava import Serial else: raise ImportError("Sorry: no implementation for your platform ('{}') available".format(os.name)) protocol_handler_packages = [ 'serial.urlhandler', ] def serial_for_url(url, *args, **kwargs): """\ Get an instance of the Serial class, depending on port/url. The port is not opened when the keyword parameter 'do_not_open' is true, by default it is. All other parameters are directly passed to the __init__ method when the port is instantiated. The list of package names that is searched for protocol handlers is kept in ``protocol_handler_packages``. e.g. we want to support a URL ``foobar://``. A module ``my_handlers.protocol_foobar`` is provided by the user. Then ``protocol_handler_packages.append("my_handlers")`` would extend the search path so that ``serial_for_url("foobar://"))`` would work. """ # check and remove extra parameter to not confuse the Serial class do_open = not kwargs.pop('do_not_open', False) # the default is to use the native implementation klass = Serial try: url_lowercase = url.lower() except AttributeError: # it's not a string, use default pass else: # if it is an URL, try to import the handler module from the list of possible packages if '://' in url_lowercase: protocol = url_lowercase.split('://', 1)[0] module_name = '.protocol_{}'.format(protocol) for package_name in protocol_handler_packages: try: importlib.import_module(package_name) handler_module = importlib.import_module(module_name, package_name) except ImportError: continue else: if hasattr(handler_module, 'serial_class_for_url'): url, klass = handler_module.serial_class_for_url(url) else: klass = handler_module.Serial break else: raise ValueError('invalid URL, protocol {!r} not known'.format(protocol)) # instantiate and open when desired instance = klass(None, *args, **kwargs) instance.port = url if do_open: instance.open() return instance