Testing a python script in a specific version
Question:
I currently have Python 2.6.2 installed on my mac. I am writing a script which MUST run on Python 2.5.2. So I want to write a python script, and test is specifically against 2.5.2 and NOT 2.6.2.
I was looking at virtualenv, but it doesn’t seem to solve my problem. I ran python virtualenv.py TEST which made a TEST dir, but it had python 2.6 in it. Is there a way to make virtualenv use a different version of python than what’s installed default on my machine? Is another way to use the #! as the first line of the python script? How would I do that?
Answers:
try #!/path/to/your/python/version
But make sure you execute the script from the terminal, and make it executable before hand: chmod 755 myscript.py
Check out tox; it’s designed to do exactly this.
Here is an example of using tox to run a hello_world.py script against multiple Python versions:
Install tox
pip install tox
Create a tox.ini configuration file
[tox]
envlist = py39, p310, p311
[testenv]
commands = python hello_world.py
- The envlist option specifies the Python versions to test against
- The commands option specifies the command to run in each environment
Run tox
tox
- This will create separate environments for Python 3.9, 3.10, and 3.11 and run the hello_world.py script in each environment.
You could just install a Python 2.5.2.
I have 3 different versions Python installed on my Lucid and they use different links under /bin/ so it’s easy to call the specific version
python -> python3 ->python3.1
python2 -> python2.7
python2.5
You can setup a sandboxed environment with different python versions using virtualenv. As Kable has done, install the 2.5. version you want to test against. Then create your virtual environment:
virtualenv --p=python2.5 myapp
To get a clean environment you may use the –no-site-packages switch with the command above. Quite handy when trying to simulate a new, fresh setup. Now activate your virtualenv:
source myapp/bin/activate
If you check the python version you should now get version 2.5.x:
python -V
Now you can install modules as you like into your virtual environment in the usual fashion:
easy_install ...
pip ...
To exit your virtual environment:
deactivate
Hope this may be of help.
Using ‘virtualenv’ you can have different isolated Python environments on a single machine. Also you can switch any-time between the different python interpreter versions.
What is virtualenv?
A Virtual Environment is an isolated working copy of Python which allows you to work on a specific project without worry of affecting other projects. It enables multiple side-by-side installations of Python, one for each project. It doesn’t actually install separate copies of Python, but it does provide a clever way to keep different project environments isolated.
How to install?
pip install virtualenv
To create virtual environment for python 2.7 :
root:~# which python2.7
/usr/bin/python2.7
root:~# which python3.4
/usr/local/bin/python3.4
You can also use a Python interpreter of your choice:
root:~# virtualenv -p /usr/bin/python2.7 Vpy27
Running virtualenv with interpreter /usr/bin/python2.7
New python executable in /root/Vpy27/bin/python2.7
Also creating executable in /root/Vpy27/bin/python
Installing setuptools, pip, wheel...done.
To begin using the virtual environment, it needs to be activated:
root:~# source Vpy27/bin/activate
The name of the current virtual environment will now appear on the left of the prompt:
(Vpy27) root:~# python -V
Python 2.7.3
Install packages as usual, for example:
(Vpy27) root:~# pip install junos-eznc >> All pip installs done here, will be available only in this environment.
If you are done working in the virtual environment for the moment, you can deactivate it:
(Vpy27) root:~# deactivate
To create virtual environment for python 3.4:
root:~# which python3.4
/usr/local/bin/python3.4
root:~# virtualenv -p /usr/local/bin/python3.4 Vpy34
root:~# source Vpy34/bin/activate
(Vpy34) root:~# python -V
Python 3.4.4
There is also a way to create virtual environment with already available site-packages.
I currently have Python 2.6.2 installed on my mac. I am writing a script which MUST run on Python 2.5.2. So I want to write a python script, and test is specifically against 2.5.2 and NOT 2.6.2.
I was looking at virtualenv, but it doesn’t seem to solve my problem. I ran python virtualenv.py TEST which made a TEST dir, but it had python 2.6 in it. Is there a way to make virtualenv use a different version of python than what’s installed default on my machine? Is another way to use the #! as the first line of the python script? How would I do that?
try #!/path/to/your/python/version
But make sure you execute the script from the terminal, and make it executable before hand: chmod 755 myscript.py
Check out tox; it’s designed to do exactly this.
Here is an example of using tox to run a hello_world.py script against multiple Python versions:
Install tox
pip install tox
Create a tox.ini configuration file
[tox]
envlist = py39, p310, p311
[testenv]
commands = python hello_world.py
- The envlist option specifies the Python versions to test against
- The commands option specifies the command to run in each environment
Run tox
tox
- This will create separate environments for Python 3.9, 3.10, and 3.11 and run the hello_world.py script in each environment.
You could just install a Python 2.5.2.
I have 3 different versions Python installed on my Lucid and they use different links under /bin/ so it’s easy to call the specific version
python -> python3 ->python3.1
python2 -> python2.7
python2.5
You can setup a sandboxed environment with different python versions using virtualenv. As Kable has done, install the 2.5. version you want to test against. Then create your virtual environment:
virtualenv --p=python2.5 myapp
To get a clean environment you may use the –no-site-packages switch with the command above. Quite handy when trying to simulate a new, fresh setup. Now activate your virtualenv:
source myapp/bin/activate
If you check the python version you should now get version 2.5.x:
python -V
Now you can install modules as you like into your virtual environment in the usual fashion:
easy_install ...
pip ...
To exit your virtual environment:
deactivate
Hope this may be of help.
Using ‘virtualenv’ you can have different isolated Python environments on a single machine. Also you can switch any-time between the different python interpreter versions.
What is virtualenv?
A Virtual Environment is an isolated working copy of Python which allows you to work on a specific project without worry of affecting other projects. It enables multiple side-by-side installations of Python, one for each project. It doesn’t actually install separate copies of Python, but it does provide a clever way to keep different project environments isolated.
How to install?
pip install virtualenv
To create virtual environment for python 2.7 :
root:~# which python2.7
/usr/bin/python2.7
root:~# which python3.4
/usr/local/bin/python3.4
You can also use a Python interpreter of your choice:
root:~# virtualenv -p /usr/bin/python2.7 Vpy27
Running virtualenv with interpreter /usr/bin/python2.7
New python executable in /root/Vpy27/bin/python2.7
Also creating executable in /root/Vpy27/bin/python
Installing setuptools, pip, wheel...done.
To begin using the virtual environment, it needs to be activated:
root:~# source Vpy27/bin/activate
The name of the current virtual environment will now appear on the left of the prompt:
(Vpy27) root:~# python -V
Python 2.7.3
Install packages as usual, for example:
(Vpy27) root:~# pip install junos-eznc >> All pip installs done here, will be available only in this environment.
If you are done working in the virtual environment for the moment, you can deactivate it:
(Vpy27) root:~# deactivate
To create virtual environment for python 3.4:
root:~# which python3.4
/usr/local/bin/python3.4
root:~# virtualenv -p /usr/local/bin/python3.4 Vpy34
root:~# source Vpy34/bin/activate
(Vpy34) root:~# python -V
Python 3.4.4
There is also a way to create virtual environment with already available site-packages.