weewx upgrade from python2 to python3

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Aug 31, 2020, 4:55:26 PM8/31/20

to weewx-user

i'm running weewx on raspbian v9, with python 2.7 weewx 4.1.1, and I'm trying to upgrade to python3. I already have python version 3.5.3 installed.

what do I need to do to run weewx under python3?

PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)"

NAME="Raspbian GNU/Linux"

VERSION_ID="9"

VERSION="9 (stretch)"

ID=raspbian

ID_LIKE=debian

HOME_URL="http://www.raspbian.org/"

SUPPORT_URL="http://www.raspbian.org/RaspbianForums"

BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

pi@raspberrypi:~ $ python --version

Python 2.7.13

pi@raspberrypi:~ $ python3 --version

Python 3.5.3

wee_config --version

4.1.1

Tom Keffer

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Aug 31, 2020, 5:08:58 PM8/31/20

to weewx-user

Take a look at the prerequisite requirements for the setup.py instructions. Specifically:

sudo apt update

# Required
sudo apt install python3-configobj
sudo apt install python3-pil
sudo apt install python3-serial
sudo apt install python3-usb

# The following tests for distutils and installs if not present:
python3 -c "import distutils" 2>/dev/null || sudo apt install python3-distutils

# Install pip3 and cheetah3:
sudo apt install python3-pip
sudo pip3 install cheetah3

# Optional: for extended almanac information
sudo apt install python3-ephem

# Required if you are using MySQL (MariaDB):
sudo apt install mysql-client
sudo apt install python3-mysqldb

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Aug 31, 2020, 5:55:40 PM8/31/20

to weewx-user

if I choose these instructions what do I change home to, weewx.conf is in /etc/weewx?

To specify an install location different from the default /home/weewx, modify the parameter home in the setup.cfg file. Mac users will want to change it to /Users/Shared/weewx.

Tom Keffer

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Aug 31, 2020, 6:06:15 PM8/31/20

to weewx-user

I'm assuming you want to keep everything the same, except you want to run under Python 3. So, all you have to do is make sure python3 gets invoked, instead of python2. How to do that depends on your install method.

A, If you did a package install using apt-get, you will need to go into /etc/default/weewx and change option WEEWX_PYTHON to

WEEWX_PYTHON=/usr/bin/python3

B. If you did a setup.py install, you will have to change the very first line of /home/weewx/bin/weewxd to read

#!/usr/bin/python3

Same with other utilities.

-tk

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Aug 31, 2020, 6:26:40 PM8/31/20

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I changed /etc/default/weewx to use /usr/bin/python3

then

sudo dpkg -i python-weewx_4.1.1-1_all.deb

but now weewx won't start and no logs in /var/log/syslog

Tom Keffer

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Aug 31, 2020, 6:49:51 PM8/31/20

to weewx-user

Any particular reason why you tried to reinstall weewx? And, the version you reinstalled is for python2.

NB: there is only one code base for weewx. There is no separate Python 2 and Python 3 versions. The only difference between the two packages is in which prerequisites get installed. But, the actually weewx code base is identical.

That is why you only needed to install the new prerequisites.

Surely there is something in the logs. What happens if you try to run weewxd directly from the command line?

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Sep 1, 2020, 4:39:47 AM9/1/20

to weewx-user

thanks for your persistence with this.

I reinstalled because I expected that the code would need to be recompiled with python3.

I can revert back to python2 by, a) changing the /etc/defaults/weewx to reference python2 and then reinstall again using "sudo dpkg -i python-weewx_4.1.1-1_all.deb"

I tried again this time with only changing the /etc/defaults/weewx file and running weewxd.

This time I got some errors due to the following:

user.alarm_multi.MyAlarm,

user.opsgenie.OpsGenieAlerts, user.opsgenie.OpsGenieHeartbeat

which I have removed and now weewxd works fine

However when I start the daemon "sudo /etc/init.d/weewx start" I still get nothing, no process is started and no logs. Any ideas?

Tom Keffer

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Sep 1, 2020, 7:40:31 AM9/1/20

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You're making things harder than it needs to be! No need to recompile anything. That is done automatically by the interpreter.

1. What is in /etc/default/weewx?

2. In /etc/default/weewx, the variable WEEWX_BIN points to the copy of weewxd to be used. Make sure it exists. If it does not, this will cause /etc/init.d/weewx to exit without warning.

-tk

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Sep 1, 2020, 8:08:53 AM9/1/20

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ok thanks I didn't know that the recompile would be done automatically.

here is the content of /etc/default/weewx

pi@raspberrypi:~ $ more /etc/default/weewx

WEEWX_PYTHON=/usr/bin/python3

WEEWX_BINDIR=/usr/share/weewx

WEEWX_BIN=/usr/bin/weewxd

WEEWX_CFG=/etc/weewx/weewx.conf

and

pi@raspberrypi:~ $ ls -altr /usr/bin/weewxd

-rwxr-xr-x 1 root root 279 Jun 1 23:16 /usr/bin/weewxd

pi@raspberrypi:~ $ ls -altr /usr/bin/python3

lrwxrwxrwx 1 root root 9 Jan 20 2017 /usr/bin/python3 -> python3.5

pi@raspberrypi:~ $ ls -altr /usr/bin/python2

lrwxrwxrwx 1 root root 9 Jan 24 2017 /usr/bin/python2 -> python2.7

pi@raspberrypi:~ $ ls -altr /usr/share/weewx

total 284

-rwxr-xr-x 1 root root 23741 Jun 1 23:16 wunderfixer

-rwxr-xr-x 1 root root 9840 Jun 1 23:16 weewxd

-rwxr-xr-x 1 root root 3806 Jun 1 23:16 wee_reports

-rwxr-xr-x 1 root root 38823 Jun 1 23:16 wee_import

-rwxr-xr-x 1 root root 3157 Jun 1 23:16 wee_extension

-rwxr-xr-x 1 root root 2195 Jun 1 23:16 wee_device

-rwxr-xr-x 1 root root 16776 Jun 1 23:16 wee_debug

-rwxr-xr-x 1 root root 43183 Jun 1 23:16 wee_database

-rwxr-xr-x 1 root root 5637 Jun 1 23:16 wee_config

-rw-r--r-- 1 root root 32452 Jun 1 23:16 six.py

-rw-r--r-- 1 root root 2888 Jun 1 23:16 daemon.py

drwxr-xr-x 237 root root 12288 Aug 29 22:38 ..

drwxr-xr-x 2 root root 4096 Sep 1 09:10 weeimport

-rw-r--r-- 1 root root 31099 Sep 1 09:10 six.pyc

-rw-r--r-- 1 root root 2712 Sep 1 09:10 daemon.pyc

drwxr-xr-x 2 root root 4096 Sep 1 09:11 weeplot

drwxr-xr-x 11 root root 4096 Sep 1 09:14 .

drwxr-xr-x 3 root root 4096 Sep 1 09:14 weecfg

drwxr-xr-x 2 root root 4096 Sep 1 09:14 __pycache__

drwxr-xr-x 3 root root 4096 Sep 1 09:14 weeutil

drwxr-xr-x 3 root root 4096 Sep 1 09:14 weedb

drwxr-xr-x 4 root root 4096 Sep 1 09:14 weewx

drwxr-xr-x 4 root root 4096 Sep 1 09:14 user

drwxr-xr-x 3 root root 4096 Sep 1 09:14 schemas

pi@raspberrypi:~ $ ls -altr /etc/weewx/weewx.conf

-rw-r--r-- 1 root root 31815 Sep 1 09:22 /etc/weewx/weewx.conf

Tom Keffer

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Sep 1, 2020, 8:32:15 AM9/1/20

to weewx-user

What are the results of the command

sudo systemctl status weewx

Then try it again after trying to start weewxd:

sudo /etc/init.d/weewx start

sudo systemctl status weewx

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Sep 1, 2020, 9:13:38 AM9/1/20

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here are the logs

pi@raspberrypi:~ $ sudo systemctl status weewx

● weewx.service - LSB: weewx weather system

Loaded: loaded (/etc/init.d/weewx; generated; vendor preset: enabled)

Active: active (exited) since Tue 2020-09-01 09:14:20 BST; 4h 57min ago

Docs: man:systemd-sysv-generator(8)

Process: 548 ExecStop=/etc/init.d/weewx stop (code=exited, status=0/SUCCESS)

Process: 692 ExecStart=/etc/init.d/weewx start (code=exited, status=0/SUCCESS)

CGroup: /system.slice/weewx.service

Sep 01 09:14:20 raspberrypi python3[727]: weewx[727] CRITICAL __main__: **** self.loadServices(config_dict)

Sep 01 09:14:20 raspberrypi python3[727]: weewx[727] CRITICAL __main__: **** File "/usr/share/weewx/weewx/engine.py", line 138, in loadServices

Sep 01 09:14:20 raspberrypi python3[727]: weewx[727] CRITICAL __main__: **** obj = weeutil.weeutil.get_object(svc)(self,config_dict)

Sep 01 09:14:20 raspberrypi python3[727]: weewx[727] CRITICAL __main__: **** File "/usr/share/weewx/weeutil/weeutil.py", line 1093, in get_object

Sep 01 09:14:20 raspberrypi python3[727]: weewx[727] CRITICAL __main__: **** mod = __import__(module)

Sep 01 09:14:20 raspberrypi python3[727]: weewx[727] CRITICAL __main__: **** File "/usr/share/weewx/user/opsgenie.py", line 61

Sep 01 09:14:20 raspberrypi python3[727]: weewx[727] CRITICAL __main__: **** except KeyError, e:

Sep 01 09:14:20 raspberrypi python3[727]: weewx[727] CRITICAL __main__: **** ^

Sep 01 09:14:20 raspberrypi python3[727]: weewx[727] CRITICAL __main__: **** SyntaxError: invalid syntax

Sep 01 09:14:20 raspberrypi python3[727]: weewx[727] CRITICAL __main__: **** Exiting.

pi@raspberrypi:~ $ sudo /etc/init.d/weewx start

[ ok ] Starting weewx (via systemctl): weewx.service.

pi@raspberrypi:~ $ sudo systemctl status weewx

● weewx.service - LSB: weewx weather system

Loaded: loaded (/etc/init.d/weewx; generated; vendor preset: enabled)

Active: active (exited) since Tue 2020-09-01 09:14:20 BST; 4h 58min ago