Honestly, I think you'll save yourself a lot of time by just upgrading your
RPi to Raspbian 10 ("buster"). Security updates for Debian 9 ("stretch")
were discontinued over a year ago.

Search the web for instructions. Here's an example:
https://www.raspberrypi.org/documentation/raspbian/updating.md

-tk

On Tue, Jul 6, 2021 at 5:50 AM J.L. Blom <[email protected]> wrote:

> On 06-07-2021 13:52, Tom Keffer wrote:
> > It looks like you're using an older version of pip, designed for
> > Python 2. Make sure you have a more modern copy.
> >
> > Check the documentation for pip:
> > https://pip.pypa.io/en/stable/installing/
> > <https://pip.pypa.io/en/stable/installing/>
> >
> > On Tue, Jul 6, 2021 at 3:27 AM J.L. Blom <[email protected]
> > <mailto:[email protected]>> wrote:
> >
> >     On 05-07-2021 17:29, Tom Keffer wrote:
> >     > You didn't say what operating system you are using, but a Python 3
> >     > version of Cheetah is not available on Debian 9 systems. What
> >     > operating system are you using? Here are a few options:
> >     >
> >     > 1. Upgrade to Debian 10;
> >     > 2. Or, use Python 2;
> >     > 3. Or, install using pip:
> >     >
> >     > pip3 install cheetah3
> >     >
> >     > The last is probably the best solution.
> >     >
> >     > -tk
> >     >
> >     > On Mon, Jul 5, 2021 at 6:35 AM J.L. Blom <[email protected]
> >     <mailto:[email protected]>
> >     > <mailto:[email protected] <mailto:[email protected]>>>
> wrote:
> >     >
> >     >     I have been a long time away as I had A: other
> >     interests/problems to
> >     >     solve and B weewx works still without problems. However I'm
> >     still
> >     >     working with version 4.1.1 and I think it's becoming time to
> >     >     upgrade to
> >     >     1.5. However there is a problem.When I try to upgrade using
> >     apt I get
> >     >     the following message:
> >     >     The following packages have unmet dependencies:
> >     >       weewx : Depends: python3-cheetah but it is not installable.
> >     >     I've tried to reinstall it (using synaptic) but no success. Can
> >     >     anybody
> >     >     shine light on this problem and how to solve it?
> >     >     Thanks in advance,
> >     >     Joep L. Blom
> >     >
> >     >     --
> >     >
> >
> >          ----------------------------------------
> >     Command "python setup.py egg_info" failed with error code 1 in
> >     /tmp/pip-build-hod7_7mb/cheetah/
> >     Is there a solution for this?
> >
> >     --
> >     Y
> >
>
>
> Thanks Tom. I went to the site and I followed the upgrade instructions
> but I assume however that the raspberry OS is unwilling to follow the
> rules and gave me the following:
> Installing collected packages: pip
>    Found existing installation: pip 9.0.1
>      Not uninstalling pip at /usr/lib/python2.7/dist-packages, outside
> environment /usr
>    Can't rollback pip, nothing uninstalled.
> Exception:
> Traceback (most recent call last):
>    File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 215,
> in main
>      status = self.run(options, args)
>    File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line
> 360, in run
>      prefix=options.prefix_path,
>    File "/usr/lib/python2.7/dist-packages/pip/req/req_set.py", line 784,
> in install
>      **kwargs
>    File "/usr/lib/python2.7/dist-packages/pip/req/req_install.py", line
> 851, in install
>      self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
>    File "/usr/lib/python2.7/dist-packages/pip/req/req_install.py", line
> 1064, in move_wheel_files
>      isolated=self.isolated,
>    File "/usr/lib/python2.7/dist-packages/pip/wheel.py", line 462, in
> move_wheel_files
>      generated.extend(maker.make(spec))
>    File
> "/usr/share/python-wheels/distlib-0.2.4-py2.py3-none-any.whl/distlib/scripts.py",
>
> line 372, in make
>      self._make_script(entry, filenames, options=options)
>    File
> "/usr/share/python-wheels/distlib-0.2.4-py2.py3-none-any.whl/distlib/scripts.py",
>
> line 276, in _make_script
>      self._write_script(scriptnames, shebang, script, filenames, ext)
>    File
> "/usr/share/python-wheels/distlib-0.2.4-py2.py3-none-any.whl/distlib/scripts.py",
>
> line 250, in _write_script
>      self._fileop.write_binary_file(outname, script_bytes)
>    File
> "/usr/share/python-wheels/distlib-0.2.4-py2.py3-none-any.whl/distlib/util.py",
>
> line 407, in write_binary_file
>      with open(path, 'wb') as f:
> IOError: [Errno 21] Is a directory: '/home/weewx/bin/pip'
> To be honest. my programming days are long behind me (as you can
> imagine) and interpreting error messages is a little difficult but maybe
> you can she your light on it.
> Joep
>
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>

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