9

Here is my tox.ini file:

dino@DINO:~/code/mplfinance$ cat tox.ini

[tox]
envlist = py36, py37, py38

[pytest]
python_files = tests.py

[testenv]
deps =
    matplotlib
    numpy
    pandas
    pytest
setenv =
    # don't use interactive backend for matplotlib in e2e tests
    MPLBACKEND = agg
commands =
    pytest

When I run tox<Enter> it kicks off pytest for each of the three environments specified. When pytest first starts (for each environment) it reports the versions of Python and a few other things that it is using. For example, for py36 I see:

py36 runtests: PYTHONHASHSEED='893013612'
py36 runtests: commands[0] | pytest
============= test session starts ==============
platform linux -- Python 3.6.7, pytest-5.4.1, py-1.8.1, pluggy-0.13.1
rootdir: /home/dino/code/mplfinance, inifile: tox.ini
collected 2 items

tests.py ..                               [100%]

=========== 2 passed in 13.48s     ==============

It says py36 runtests: ... and then it says platform linux -- Python 3.6.7, ... so all is good.

Similarly, I see

py37 runtests: PYTHONHASHSEED='893013612'
py37 runtests: commands[0] | pytest
======================== test session starts ==================
platform linux -- Python 3.7.4, ...

All good again.

The problem is, when it comes to py38 I see:

py38 runtests: PYTHONHASHSEED='893013612'
py38 runtests: commands[0] | pytest
============ test session starts ==================
platform linux -- Python 3.6.7, pytest-5.4.1, py-1.8.1, pluggy-0.13.1
rootdir: /home/dino/code/mplfinance, inifile: tox.ini
collected 2 items

tests.py ..                                               [100%]

============== 2 passed in 16.19s ====================

Why am I seeing Python 3.6.7 for py38 ??? Am I doing something wrong here?

Many thanks, in advance, for your help!

For what it's worth, here is my general environment information, running WSL:

dino@DINO:~/code/mplfinance$ cat /etc/os-release
NAME="Ubuntu"
VERSION="18.04.2 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.2 LTS"
VERSION_ID="18.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic

dino@DINO:~/code/mplfinance$ uname -a
Linux DINO 4.4.0-18362-Microsoft #476-Microsoft Fri Nov 01 16:53:00 PST 2019 x86_64 x86_64 x86_64 GNU/Linux

dino@DINO:~/code/mplfinance$ python --version
Python 3.7.4
Laurent Bristiel
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Daniel Goldfarb
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    Do you have Python 3.8 installed? AFAIK, it is not installed by default on 18.04 (which would not explain the fallback to 3.6, though). – MrBean Bremen Mar 16 '20 at 17:58
  • I was thinking that may be the issue; So are you saying that tox won't install any Python version into its virtual environments that is higher than the system Python version (but it willl install those that are less)?? – Daniel Goldfarb Mar 16 '20 at 18:03
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    It may not know how to install them - try to install 3.8 manually and test again. Note that this is only a guess based on some previous (not recent) experience with tox. – MrBean Bremen Mar 16 '20 at 18:05
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    I tried installing Python 3.8 (using apt-get) but that created problems (tox failed to create a py38 environment at all). I suspect the problems were because my Python version 3.7 is packaged with Anaconda. So I apt removed the 3.8 and instead used conda to create a 3.8 conda environment; then activated it. When I did that, tox worked fine for 3.6, 3.7, **and** 3.8. Thanks!! – Daniel Goldfarb Mar 16 '20 at 19:07
  • Ah, ok, that explains it! – MrBean Bremen Mar 16 '20 at 19:08

0 Answers0