RobD
Reputation: 105
No module named 'serial'
I have a piece of Python3 code running on a Pi3B+ with Raspbian Buster that uses the serial library. I imported this library with
sudo apt-get install python3-serial
The Python script is placed in .../domoticz/scripts/python/script_time_test.py to activate it every minute bij de Domoticz scheduler.
If I run this piece of code in Thonny all libraries are imported without problems. However if the Domotics sceduler starts the scripts, all standard libraries that come with the raspbian distribution are imported without problems but the serial library ends up with the error. The results are the same on Stretch and Buster
The code contains at this moment only import commands
#!/usr/bin/python3
# -*- coding: utf-8 -*-
import datetime
import json
import os.path
import shutil
import threading
import time
import serial
2019-10-29 09:37:00.162 Error: EventSystem: Failed to execute python event script "/home/pi/domoticz/scripts/python/script_time_VirtDev.py"
2019-10-29 09:37:00.162 Error: EventSystem: Traceback (most recent call last):
2019-10-29 09:37:00.162 Error: EventSystem: File "/home/pi/domoticz/scripts/python/script_time_VirtDev.py", line 10, in <module>
2019-10-29 09:37:00.162 Error: EventSystem: import serial
2019-10-29 09:37:00.162 Error: EventSystem: ImportError: No module named 'serial'
environment Thonny
environ({
'DESKTOP_SESSION': 'LXDE-pi',
'XDG_SESSION_TYPE': 'x11',
'INFINALITY_FT_GLOBAL_EMBOLDEN_Y_VALUE': '0',
'THONNY_USER_DIR': '/home/pi/.thonny',
'INFINALITY_FT_AUTOHINT_SNAP_STEM_HEIGHT': '100',
'SHELL': '/bin/bash',
'INFINALITY_FT_GLOBAL_EMBOLDEN_X_VALUE': '0',
'XDG_MENU_PREFIX': 'lxde-pi-',
'INFINALITY_FT_USE_KNOWN_SETTINGS_ON_SELECTED_FONTS': 'true',
'INFINALITY_FT_STEM_ALIGNMENT_STRENGTH': '25',
'INFINALITY_FT_FILTER_PARAMS': '11 22 38 22 11',
'INFINALITY_FT_AUTOHINT_VERTICAL_STEM_DARKEN_STRENGTH': '25',
'_LXSESSION_PID': '654',
'DBUS_SESSION_BUS_ADDRESS': 'unix:path=/run/user/1000/bus',
'INFINALITY_FT_STEM_SNAPPING_SLIDING_SCALE': '40',
'SAL_USE_VCLPLUGIN': 'gtk',
'TEXTDOMAIN': 'Linux-PAM',
'XDG_SESSION_PATH': '/org/freedesktop/DisplayManager/Session0',
'XDG_VTNR': '7',
'PYTHONIOENCODING': 'ASCII',
'XDG_SESSION_DESKTOP': 'lightdm-xsession',
'XDG_GREETER_DATA_DIR': '/var/lib/lightdm/data/pi',
'INFINALITY_FT_FRINGE_FILTER_STRENGTH': '0',
'XDG_CURRENT_DESKTOP': 'LXDE',
'LANG': 'en_GB.UTF-8',
'DESKTOP_STARTUP_ID': 'pcmanfm-860-raspberrypi-/usr/bin/thonny-3_TIME101146699',
'HOME': '/home/pi',
'GPG_AGENT_INFO': '/run/user/1000/gnupg/S.gpg-agent:0:1',
'XAUTHORITY': '/home/pi/.Xauthority',
'XDG_DATA_DIRS': '/usr/local/share:/usr/share/raspi-ui-overrides:/usr/share:/usr/share/gdm:/var/lib/menu-xdg',
'INFINALITY_FT_CHROMEOS_STYLE_SHARPENING_STRENGTH': '0',
'SSH_AUTH_SOCK': '/tmp/ssh-SpT8Yoekyndc/agent.654',
'INFINALITY_FT_GAMMA_CORRECTION': '0 100',
'INFINALITY_FT_AUTOHINT_INCREASE_GLYPH_HEIGHTS': 'true',
'XDG_SEAT_PATH': '/org/freedesktop/DisplayManager/Seat0',
'GDMSESSION': 'lightdm-xsession',
'USER': 'pi',
'XDG_CONFIG_DIRS': '/etc/xdg',
'INFINALITY_FT_STEM_FITTING_STRENGTH': '25',
'XDG_SESSION_ID': 'c1',
'PYTHONUNBUFFERED': '1',
'INFINALITY_FT_CONTRAST': '0',
'SSH_AGENT_PID': '826',
'PWD': '/home/pi',
'INFINALITY_FT_BRIGHTNESS': '0',
'INFINALITY_FT_BOLD_EMBOLDEN_X_VALUE': '0',
'DISPLAY': ':0.0',
'INFINALITY_FT_BOLD_EMBOLDEN_Y_VALUE': '0',
'XDG_RUNTIME_DIR': '/run/user/1000',
'INFINALITY_FT_WINDOWS_STYLE_SHARPENING_STRENGTH': '10',
'PATH': '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games','INFINALITY_FT_AUTOHINT_HORIZONTAL_STEM_DARKEN_STRENGTH': '10',
'INFINALITY_FT_USE_VARIOUS_TWEAKS': 'true',
'INFINALITY_FT_GRAYSCALE_FILTER_STRENGTH': '0',
'XDG_CONFIG_HOME': '/home/pi/.config',
'XDG_SEAT': 'seat0',
'LOGNAME': 'pi'
})
environment Domoticz
environ({
'PWD': '/',
'PATH': '/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin',
'LANG': 'en_GB.UTF-8',
'INVOCATION_ID': 'ed8e00a2ea7943249b6c18f40f3e9c5e',
'JOURNAL_STREAM': '8:12744'
})
imported modules by the scheduled job
Please wait a moment while I gather a list of all available modules...
CDROM _tracemalloc hashlib script_tiHR930-P3Dom
DLFCN _warnings heapq script_time_VirtDev
Domoticz _weakref hmac script_time_demo
DomoticzEvents _weakrefset html select
IN abc http selectors
TYPES aifc idlelib shelve
__future__ antigravity imaplib shlex
_ast argparse imghdr shutil
_bisect array imp signal
_bootlocale ast importlib site
_bz2 asynchat inspect sitecustomize
_codecs asyncio io smtpd
_codecs_cn asyncore ipaddress smtplib
_codecs_hk atexit itertools sndhdr
_codecs_iso2022 audioop json socket
_codecs_jp base64 keyword socketserver
_codecs_kr bdb lib2to3 spwd
_codecs_tw binascii linecache sqlite3
_collections binhex locale sre_compile
_collections_abc bisect logging sre_constants
_compat_pickle builtins lzma sre_parse
_compression bz2 macpath ssl
_crypt cProfile macurl2path stat
_csv calendar mailbox statistics
_ctypes cgi mailcap string
_ctypes_test cgitb marshal stringprep
_curses chunk math struct
_curses_panel cmath mimetypes subprocess
_datetime cmd mmap sunau
_dbm code modulefinder symbol
_decimal codecs multiprocessing symtable
_dummy_thread codeop netrc sys
_elementtree collections nis sysconfig
_functools colorsys nntplib syslog
_hashlib compileall ntpath tabnanny
_heapq concurrent nturl2path tarfile
_imp configparser numbers telnetlib
_io contextlib opcode tempfile
_json copy operator termios
_locale copyreg optparse test
_lsprof crypt os textwrap
_lzma csv ossaudiodev this
_markupbase ctypes parser threading
_md5 curses pathlib time
_multibytecodec datetime pdb timeit
_multiprocessing dbm pickle tkinter
_opcode decimal pickletools token
_operator difflib pipes tokenize
_osx_support dis pkgutil trace
_pickle distutils platform traceback
_posixsubprocess doctest plistlib tracemalloc
_pydecimal domoticz poplib tty
_pyio dummy_threading posix turtle
_random email posixpath types
_sha1 encodings pprint typing
_sha256 ensurepip profile unicodedata
_sha512 enum pstats unittest
_signal errno pty urllib
_sitebuiltins faulthandler pwd uu
_socket fcntl py_compile uuid
_sqlite3 filecmp pyclbr venv
_sre fileinput pydoc warnings
_ssl fnmatch pydoc_data wave
_stat formatter pyexpat weakref
_string fpectl queue webbrowser
_strptime fractions quopri wsgiref
_struct ftplib random xdrlib
_symtable functools re xml
_sysconfigdata gc readline xmlrpc
_sysconfigdata_m genericpath reloader xxlimited
_testbuffer getopt reprlib xxsubtype
_testcapi getpass resource zipapp
_testimportmultiple gettext rlcompleter zipfile
_testmultiphase glob runpy zipimport
_thread googlepubsub sched zlib
_threading_local grp script__testWHR930
_tkinter gzip script_device_demo
Upvotes: 0
Views: 5490
Answers (2)
RobD
Reputation: 105
Finally I found out. The serial package was installed multiple times in different locations and that caused the problem. I uninstalled, removed and purged all versions.
To get things working I had to install with sudo apt-get install python3-serial and not the pip installer, because pip installed the python3 package in the python2.7 folders.
Upvotes: 1
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