def __init__(self, target_cwd):
report_time("Before MainBackend")
MainBackend.__init__(self)
report_time("After MainBackend")
global _backend
_backend = self
self._ini = None
self._object_info_tweakers = []
self._import_handlers = {}
self._input_queue = queue.Queue()
self._source_preprocessors = []
self._ast_postprocessors = []
self._main_dir = os.path.dirname(sys.modules["thonny"].__file__)
self._heap = {
} # WeakValueDictionary would be better, but can't store reference to None
self._source_info_by_frame = {}
site.sethelper() # otherwise help function is not available
self._install_fake_streams()
self._install_repl_helper()
self._current_executor = None
self._io_level = 0
self._tty_mode = True
self._tcl = None
update_system_path(os.environ,
get_augmented_system_path(get_exe_dirs()))
# clean __main__ global scope
for key in list(__main__.__dict__.keys()):
if not key.startswith("__") or key in {"__file__", "__cached__"}:
del __main__.__dict__[key]
# unset __doc__, then exec dares to write doc of the script there
__main__.__doc__ = None
logger.info("Loading plugins")
report_time("Before loading plugins")
execute_with_frontend_sys_path(self._load_plugins)
report_time("After loading plugins")
# preceding code was run in the directory containing thonny module, now switch to provided
try:
os.chdir(os.path.expanduser(target_cwd))
except OSError:
try:
os.chdir(os.path.expanduser("~"))
except OSError:
os.chdir("/") # yes, this works also in Windows
# ... and replace current-dir path item
# start in shell mode (may be later switched to script mode)
# required in shell mode and also required to overwrite thonny location dir
sys.path[0] = ""
sys.argv[:] = [""] # empty "script name"
if os.name == "nt":
self._install_signal_handler()
def get_environment_with_overrides(overrides):
env = os.environ.copy()
for key in overrides:
if overrides[key] is None and key in env:
del env[key]
else:
assert isinstance(overrides[key], str)
if key.upper() == "PATH":
update_system_path(env, overrides[key])
else:
env[key] = overrides[key]
return env
