AttributeError: no such attribute

Hello. It appears I’ve triggered an issue with Thonny 4.0:

Hopefully helpful background:

I just flashed a D1 Mini fine with Thonny 4.0 (also tried w/4.1) (w/‘dio’ mode) OK but cannnot get a REPL post reboot:

"PROBLEM IN THONNY'S BACK-END: Internal error (thonny.plugins.micropython.mp_back.ManagementError: Script produced errors).
See Thonny's backend.log for more info.
You may need to press "Stop/Restart" or hard-reset your MicroPython device and try again.


Process ended with exit code 0."

• I can connect with gtkterm OK to get a REPL and I was able to download Thonny 3.X (I just grabbed an earlier version randomly) and get a REPL as well.

• I have an esp32 connected via the other USB port so it seems like maybe this is D1 mini or esp8266 related (or maybe a bad D1? I just got it and never used them yet…)

Anyhow, here’s the backend.log

backend.log
21:34:22.443 INFO    thonny: Thonny version: 4.0.1
21:34:22.444 INFO    thonny: cwd: /home/john
21:34:22.444 INFO    thonny: original argv: ['/home/john/apps/thonny/bin/python3.10', '-u', '-B', '/home/john/apps/thonny/lib/python3.10/site-packages/thonny/plugins/esp/esp_back.py', "{'clean': True, 'port': '/dev/ttyUSB0', 'dtr': None, 'rts': None, 'submit_mode': None, 'interrupt_on_connect': False, 'write_block_size': None, 'write_block_delay': None, 'proxy_class': 'ESP8266Proxy', 'sync_time': True, 'validate_time': False, 'local_rtc': True}"]
21:34:22.444 INFO    thonny: sys.executable: /home/john/apps/thonny/bin/python3.10
21:34:22.444 INFO    thonny: sys.argv: ['/home/john/apps/thonny/lib/python3.10/site-packages/thonny/plugins/esp/esp_back.py', "{'clean': True, 'port': '/dev/ttyUSB0', 'dtr': None, 'rts': None, 'submit_mode': None, 'interrupt_on_connect': False, 'write_block_size': None, 'write_block_delay': None, 'proxy_class': 'ESP8266Proxy', 'sync_time': True, 'validate_time': False, 'local_rtc': True}"]
21:34:22.444 INFO    thonny: sys.path: ['/home/john/apps/thonny/lib/python3.10/site-packages/thonny/plugins/esp', '/home/john/apps/thonny/lib/python310.zip', '/home/john/apps/thonny/lib/python3.10', '/home/john/apps/thonny/lib/python3.10/lib-dynload', '/home/john/.local/lib/python3.10/site-packages', '/home/john/apps/thonny/lib/python3.10/site-packages']
21:34:22.444 INFO    thonny: sys.flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=1, no_user_site=0, no_site=0, ignore_environment=0, verbose=0, bytes_warning=0, quiet=0, hash_randomization=1, isolated=0, dev_mode=False, utf8_mode=0, warn_default_encoding=0)
21:34:22.444 INFO    thonny.plugins.micropython.bare_metal_backend: Starting backend, args: {'clean': True, 'port': '/dev/ttyUSB0', 'dtr': None, 'rts': None, 'submit_mode': None, 'interrupt_on_connect': False, 'write_block_size': None, 'write_block_delay': None, 'proxy_class': 'ESP8266Proxy', 'sync_time': True, 'validate_time': False, 'local_rtc': True}
21:34:22.445 INFO    thonny.plugins.micropython.bare_metal_backend: Initial submit_mode: raw_paste, write_block_size: 127, write_block_delay: 0, read_block_size: 0
21:34:22.445 INFO    thonny.plugins.micropython.mp_back: Initializing MicroPythonBackend of type EspMicroPythonBackend
21:34:22.445 INFO    thonny: TIME/MODS 0.035 before prepare (+73 modules)
21:34:22.445 INFO    thonny: NEW MODS ['__future__', '_bz2', '_compression', '_datetime', '_heapq', '_lzma', '_posixsubprocess', '_queue', '_struct', '_tkinter', 'array', 'binascii', 'bz2', 'datetime', 'encodings.ascii', 'errno', 'faulthandler', 'fcntl', 'fnmatch', 'gettext', 'heapq', 'lzma', 'math', 'ntpath', 'pathlib', 'platform', 'queue', 'select', 'selectors', 'serial', 'serial.serialposix', 'serial.serialutil', 'shlex', 'shutil', 'signal', 'struct', 'subprocess', 'termios', 'textwrap', 'thonny.backend', 'thonny.base_file_browser', 'thonny.codeview', 'thonny.config_ui', 'thonny.editors', 'thonny.languages', 'thonny.misc_utils', 'thonny.plugins', 'thonny.plugins.backend_config_page', 'thonny.plugins.micropython', 'thonny.plugins.micropython.bare_metal_backend', 'thonny.plugins.micropython.connection', 'thonny.plugins.micropython.mp_back', 'thonny.plugins.micropython.mp_common', 'thonny.plugins.micropython.mp_front', 'thonny.plugins.micropython.serial_connection', 'thonny.plugins.micropython.webrepl_connection', 'thonny.roughparse', 'thonny.running', 'thonny.tktextext', 'thonny.ui_utils', 'thonny.workdlg', 'tkinter', 'tkinter.commondialog', 'tkinter.constants', 'tkinter.dialog', 'tkinter.filedialog', 'tkinter.font', 'tkinter.messagebox', 'tkinter.simpledialog', 'tkinter.ttk', 'urllib', 'urllib.parse', 'zlib']
21:34:22.446 INFO    thonny.plugins.micropython.mp_back: Sending interrupt
21:34:22.446 INFO    thonny.plugins.micropython.mp_back: Done sending interrupt
21:34:22.464 INFO    thonny.plugins.micropython.bare_metal_backend: Discarding stdout: '\r\n'
21:34:22.474 INFO    thonny.plugins.micropython.bare_metal_backend: Discarding stdout: ''
21:34:22.479 INFO    thonny.plugins.micropython.bare_metal_backend: Discarding stdout: 'OK\r\n'
21:34:22.479 INFO    thonny.plugins.micropython.bare_metal_backend: Discarding stdout: 'MPY: soft reboot\r\n'
21:34:22.506 INFO    thonny.plugins.micropython.bare_metal_backend: Discarding stdout: ''
21:34:22.530 INFO    thonny: TIME/MODS 0.085 got welcome 
21:34:22.530 INFO    thonny: TIME/MODS 0.000 bef preparing helpers 
21:34:22.530 INFO    thonny.plugins.micropython.mp_back: Preparing helpers
21:34:22.530 INFO    thonny: TIME/MODS 0.000 befsubcode 
21:34:22.535 INFO    thonny.plugins.micropython.bare_metal_backend: Discarding stdout: '\r\n'
21:34:22.545 INFO    thonny.plugins.micropython.bare_metal_backend: Discarding stdout: ''
21:34:22.680 INFO    thonny: TIME/MODS 0.150 affsubcode 
21:34:22.707 INFO    thonny: TIME/MODS 0.027 affforw 
21:34:22.707 INFO    thonny: TIME/MODS 0.000 prepared helpers 
21:34:22.707 INFO    thonny: TIME/MODS 0.000 befsubcode 
21:34:22.718 INFO    thonny: TIME/MODS 0.011 affsubcode 
21:34:22.744 INFO    thonny: TIME/MODS 0.026 affforw 
21:34:22.744 ERROR   thonny.plugins.micropython.mp_back: Exception in MicroPython main method
Traceback (most recent call last):
  File "/home/john/apps/thonny/lib/python3.10/site-packages/thonny/plugins/micropython/mp_back.py", line 151, in __init__
    self._prepare_after_soft_reboot(clean)
  File "/home/john/apps/thonny/lib/python3.10/site-packages/thonny/plugins/micropython/mp_back.py", line 185, in _prepare_after_soft_reboot
    self._update_cwd()
  File "/home/john/apps/thonny/lib/python3.10/site-packages/thonny/plugins/micropython/bare_metal_backend.py", line 458, in _update_cwd
    super()._update_cwd()
  File "/home/john/apps/thonny/lib/python3.10/site-packages/thonny/plugins/micropython/mp_back.py", line 449, in _update_cwd
    self._cwd = self._evaluate("__thonny_helper.getcwd()")
  File "/home/john/apps/thonny/lib/python3.10/site-packages/thonny/plugins/micropython/mp_back.py", line 571, in _evaluate
    raise ManagementError("Script produced errors", script, out, err)
thonny.plugins.micropython.mp_back.ManagementError: Script produced errors
21:34:22.744 ERROR   thonny.plugins.micropython.mp_back: ManagementError details:
SCRIPT: __thonny_helper.print_mgmt_value(__thonny_helper.getcwd())

STDOUT: 

STDERR: Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 42, in getcwd
AttributeError: no such attribute

This is on Ubuntu 22.04.1 LTS

(Thank you for a great IDE BTW, nothing else come close IMHO)

[aivarannamaa]

Thanks, this is good to know, at least for explaining next issues. I’m surprised that the “ESP8266 with 512kiB flash” version did not have the getwcd function, as if it didn’t have any filesystem at all.

[jouellnyc]

Right. I figured it could be good to know. Sometimes mistakes (mine here) can be fruitful!