how to switch from python2 to python3

[Tarmo]

Hi!

Upgraded successfully to 4.0. Now I would like to switch to Pyhton3. Is the clean install preferred option?

running raspi & buster + few extensions

[vince]

On Thursday, April 30, 2020 at 11:54:38 AM UTC-7, Tarmo wrote:

Upgraded successfully to 4.0. Now I would like to switch to Pyhton3. Is the clean install preferred option?

If you used setup.py, you can do "python3 setup.py build ; python3 setup.py install" in general, but you'll need the package prerequisites for python3 installed of course.

[Leon Shaner]

Tamo,

I did it in such a way as to avoid changing the system-wide default.
I'm on Raspberry Pi, and several system-related functions still expect Python 2.7.

What I did is certainly not the only way, but it works for me...
On my system, /usr/local/sbin is already in the path ahead of system default locations and it is set via /etc/profile (but you could do it in your ~/.profile or ~/.bashrc or other dot files):

  PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

Based on that, I did the following:

pi@nixie:~ $ cd /usr/local/sbin
pi@nixie:/usr/local/sbin $ sudo ln -s ../../bin/python3 python

That yields this behavior:

pi@nixie:~ $ which python
/usr/local/sbin/python
pi@nixie:~ $ env python --version
Python 3.7.3

And because the majority of weewx python scripts begin with the following, it means they will end up using Python 3:

#!/usr/bin/env python

HTH,

Regards,
\Leon

Tarmo wrote on 4/30/20 2:54 PM:

Hi!

Upgraded successfully to 4.0. Now I would like to switch to Pyhton3. Is the clean install preferred option?

running raspi & buster + few extensions

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[Tom Keffer]

Tarmo: what kind of install did you do?

--

[Tarmo]

I did installation using setup.py

On Thursday, April 30, 2020 at 10:39:34 PM UTC+3, Tom Keffer wrote:

Tarmo: what kind of install did you do?

On Thu, Apr 30, 2020 at 11:54 AM Tarmo <tso...@gmail.com> wrote:

Hi!

Upgraded successfully to 4.0. Now I would like to switch to Pyhton3. Is the clean install preferred option?

running raspi & buster + few extensions

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[Tom Keffer]

Then to switch between the two, all you need do is install the prerequisites for Python 3. You can then invoke any of the executables using whatever version of Python you want. For example,

python2 ./bin/weewxd

or

python3 ./bin/weewxd

For a list of the prerequisites, see the guide Installation using setup.py.

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[Tarmo]

did a fresh install. everything is working good. thank you!