Whenever I run python3 -m venv venv I get this error. I don't get this error on my Mac that is the version behind Mojave. I'm not sure what the issue is, and the error text is very brief:
Error: Command /Users/marcus/venv/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']' died with <Signals.SIGABRT: 6>.
Operating System: Mac OS 10.14.3
Python Version: 3.7.2
Blood Pressure: high
I realized after staring at the line for so long that it was complaining mostly about pip and that this was probably caused by Mac OS X's system pip, which is protected.
My venv came alive with the without pip flags like so: python3 -m venv venv --without-pip.
here's what works for me the best:
virtualenv -p python3 venv && source venv/bin/activate
Related
I have installed Raspbian Lite OS in Raspberry Pi zero.
I found that Raspbian Lite comes with Python3 as default.
But I am gonna run some scripts that uses libraries that are Python2 Compatible.
So I tried to change the default Python version from Python3 to Python2 (Specifically Python2.7.18)
After so much searching and trying, instructions from [this page][1] made my job
Now if I try to check in command writing
python --version
It shows me that it is Python2.7.18
But the problem is I am not being able to install any packages using
sudo apt-get install <python-packagename>
It shows me Errors like
1.Package "python-pip" has no installation candidate (When I tried to install pip)
2. Package python-numpy has no installation candidate (when I tried to install numpy)
3. unable to locate package python-pyaudio (when I tried to install pyaudio)
I am searching but no solution.
Can anyone please help? I am frozen in a critical stage of my project .
Generally, for new raspbian/raspios os with python 3 by default, it is not suggested to replace the system python interpreter to python 2, it may break some system component's dependency.
Instead, you can create a python 2 virtual env, if you need to run python2 scripts.
sudo apt-get install python3-pip
pip install virtualenv
virtualenv -p /usr/bin/python2.7 venv
source venv/bin/activate
You can test the python version as following,
(venv) $ python --version
I have two servers that are running CentOS 7.8 with all the latest patches as of the date of this post. On one server I can create a venv, and on the other I get an error. Here is the command used to create the venv:
python3.6 -m venv venv
The error is:
Error: Command '['/root/venv/bin/python3.6', '-Im', 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1.
So it seems there is a problem after the venv is created. In fact, it makes the links to the python interpreters in venv/bin, but the lib64/python3.6 and lib/python3.6 directories that are created have only empty site-packages in them. I get the problem whether running the command with root privileges (as above) or as a non-privileged user. On the other system, which is not quite the same hardware but very similar, I get no errors.
I have tried a bunch of things including completely uninstalling all the python3 rpms and reinstalling them on both systems. The python3 modules installed are:
python3, python3-devel, python3-libs, python3-other-rpm-macros, python3-pip, python3-rpm-generators, python3-setuptools, python3-tkinter, python3-wheel. All these are installed using the centos repos.
I have searched the internet and one thing that works is to use --no-pip. However, not surprisingly, if I do that I get a venv with no pip, which does not work very well. The version of pip that is installed with the rpm is version 9.0.3. However, I have tried upgrading pip:
python3.6 -m pip install --upgrade pip
This installs pip 20.1. Interestingly, it is installed in /usr/local/lib/python/site-packages. In any event, it doesn't change anything and I get essentially the same error message.
I have even gone as far as rsyncing the /usr/lib/python3.6 and /usr/lib64/python3.6 (using -avu --delete) on the two servers so that they are identical. All to no avail. I am at a loss to know what to do.
I can of course hack things to make them work, but since I am using this to automatically build test environments I really need to get it working automatically. Suggestions would be greatly appreciated.
I've had the same issue on CentOS Linux release 7.9.2009 (Core) and solved it by installing the following system packages:
yum install python36-devel
yum install python36-setuptools
yum install python36-virtualenv
python3.6 -m pip install --upgrade pip
Used virtualenv to install the venv into the project-root:
python3 -m virtualenv venv-dev
After sourcing the venv everything looks good and I could install the needed requirements:
. ./venv-dev/bin/activate
python3 --version
Python 3.6.8
pip3 --version
pip 21.1.1 from /project/root/dir/venv-dev/lib/python3.6/site-packages/pip (python 3.6)
pip3 install -r requirements/dev.txt
Successfully installed ...
How to install TensorFlow on Python 3.7
Trying:
D:\Users\Downloads>pip install tensorflow
ERROR: Could not find a version that satisfies the requirement tensorflow (from versions: none)
ERROR: No matching distribution found for tensorflow
Windows 10 OS
And with vent error, too
(venv) C:\Users\KvaksManYT>pip install --upgrade tensorflow
ERROR: Could not find a version that satisfies the requirement tensorflow (from versions: none)
ERROR: No matching distribution found for tensorflow
I would recommend using a virtual environment using pip install vitualenv. Then, depending on your OS, you want to create and activate an environment.
python3 -m venv /path/to/new/virtual/environment
Then, activate this environment using,
source ./venv/bin/activate
Now, you can install any Python packages you want.
pip install tensorflow==2.0.0
you can install Tensorflow follow those steps
Ubuntu/Linux /mac os /windows
virtualenv does not require a mention pip version
for system install, you need to mention pip version
upgrade pip version
pip install --upgrade pip
#virtualenv install
pip install --upgrade tensorflow
#system install
pip3 install --user --upgrade tensorflow
reference https://www.tensorflow.org/install/pip
I had the same problem with Windows 10 x64, and it was caused because I was using the wrong Python version, both globally and in the venv. I found questions on the issue multiple times on the internet, including yours.
Be sure to use Python versions 3.5-3.8, as per requirements, but also x64, not x32.
Namely, I ran into this error using both
a venv with 3.9.1 x64 (python --version),
and my globally installed 3.8.2 x32 (python3 --version).
So, I downloaded the x64-version of Python 3.8.6 from here.
Note that the command venv does not allow specifying the python version used in the virtual environment,
as per an answer on this question. So I used virtualenv, which I obviously had to install in my global Python version first.
To specify the Python version used in the venv, I used the command virtualenv, as in:
virtualenv --python="C:\Users\me\AppData\Local\Programs\Python\Python38\python.exe myvenv
where you have to give the path to the newly downloaded Python distribution you want to use, if there are several on your PC (for example, I had Python38-32 and Python39 folders in that directory).
Check Python versions in virtual environment
After I activate my myvenv, created as above, I verify the Python versions as follows:
python3 --version
> Python 3.8.2
python --version
> Python 3.8.6
Then, using the command
import struct
print(struct.calcsize("P") * 8)
Within either python3 or python, shows me whether the version is 32bit or 64bit, as per this answer. The python returns a 64, so that is the one you want to use (not python3).
Finally, within the virtual environment, you can run
pip install --upgrade tensorflow
and it will download and install. (Meanwhile, pip3 install --upgrade tensorflow would still return your error inside and outside the virtual enviroment.)
Hi I am running Ubuntu 16.04.
I have had problems with my pip, it seems like it is installing correctly but when I open python and go to import, it gives me an error saying it cannot be found.
I read other posts and it seems like pip is talking to the wrong version of python.
When I run:
>> which pip
/home/Username/.local/bin/pip
>> which python
/usr/bin/python
I tried uninstalling pip and then reinstalling it but when I run "which pip" it comes up the same location. I can't use this pip to download any python packages. Does anyone have any idea how to fix this?
Edit:
When i put in the terminal the following commands the output is:
>> python -V
Python 2.7.12
>> pip -V
pip 9.0.1 from /home/heatdeath/.local/lib/python2.7/site-packages (python 2.7)
You can cd to YOUR_ENV/lib/pythonxx/site-packages/ and have a look, but is there any convenient ways?
pip freeze list all the packages installed including the system environment's.
You can list only packages in the virtualenv by
pip freeze --local
or
pip list --local.
This option works irrespective of whether you have global site packages visible in the virtualenv.
Note that restricting the virtualenv to not use global site packages isn't the answer to the problem, because the question is on how to separate the two lists, not how to constrain our workflow to fit limitations of tools.
Credits to #gvalkov's comment here. Cf. also pip issue 85.
Calling pip command inside a virtualenv should list the packages visible/available in the isolated environment. Make sure to use a recent version of virtualenv that uses option --no-site-packages by default. This way the purpose of using virtualenv is to create a python environment without access to packages installed in system python.
Next, make sure you use pip command provided inside the virtualenv (YOUR_ENV/bin/pip). Or just activate the virtualenv (source YOUR_ENV/bin/activate) as a convenient way to call the proper commands for python interpreter or pip
~/Projects$ virtualenv --version
1.9.1
~/Projects$ virtualenv -p /usr/bin/python2.7 demoenv2.7
Running virtualenv with interpreter /usr/bin/python2.7
New python executable in demoenv2.7/bin/python2.7
Also creating executable in demoenv2.7/bin/python
Installing setuptools............................done.
Installing pip...............done.
~/Projects$ cd demoenv2.7/
~/Projects/demoenv2.7$ bin/pip freeze
wsgiref==0.1.2
~/Projects/demoenv2.7$ bin/pip install commandlineapp
Downloading/unpacking commandlineapp
Downloading CommandLineApp-3.0.7.tar.gz (142kB): 142kB downloaded
Running setup.py egg_info for package commandlineapp
Installing collected packages: commandlineapp
Running setup.py install for commandlineapp
Successfully installed commandlineapp
Cleaning up...
~/Projects/demoenv2.7$ bin/pip freeze
CommandLineApp==3.0.7
wsgiref==0.1.2
What's strange in my answer is that package 'wsgiref' is visible inside the virtualenv. Its from my system python. Currently I do not know why, but maybe it is different on your system.
In Python3
pip list
Empty venv is
Package Version
---------- -------
pip 19.2.3
setuptools 41.2.0
To create a new environment
python3 -m venv your_foldername_here
Activate
cd your_foldername_here
source bin/activate
Deactivate
deactivate
You can also stand in the folder and give the virtual environment a name/folder (python3 -m venv name_of_venv).
Venv is a subset of virtualenv that is shipped with Python after 3.3.
list out the installed packages in the virtualenv
step 1:
workon envname
step 2:
pip freeze
it will display the all installed packages and installed packages and versions
If you're still a bit confused about virtualenv you might not pick up how to combine the great tips from the answers by Ioannis and Sascha. I.e. this is the basic command you need:
/YOUR_ENV/bin/pip freeze --local
That can be easily used elsewhere. E.g. here is a convenient and complete answer, suited for getting all the local packages installed in all the environments you set up via virtualenvwrapper:
cd ${WORKON_HOME:-~/.virtualenvs}
for dir in *; do [ -d $dir ] && $dir/bin/pip freeze --local > /tmp/$dir.fl; done
more /tmp/*.fl
why don't you try pip list
Remember I'm using pip version 19.1 on python version 3.7.3
If you are using pip 19.0.3 and python 3.7.4. Then go for pip list command in your virtualenv. It will show all the installed packages with respective versions.
.venv/bin/pip freeze worked for me in bash.
In my case the flask version was only visible under so I had to go to
C:\Users\\AppData\Local\flask\venv\Scripts>pip freeze --local
Using python3 executable only, from:
Gitbash:
winpty my_venv_dir/bin/python -m pip freeze
Linux:
my_venv_dir/bin/python -m pip freeze