I'm having a little trouble with virtualenv on Mac OS X Yosemite. After I couldn't run virtualenv at all first, I installed Python 3 via brew (previously I installed it via the package on python.org). I linked this installation of python3, updated pip and ran pip3 install virtualenv. When I try to run virtualenv (e.g. $ virtualenv --python=python3 ../virtualenv), I get the following error message.
Traceback (most recent call last):
File "/usr/local/bin/virtualenv", line 7, in <module>
from virtualenv import main
File "/usr/local/bin/virtualenv.py", line 7, in <module>
from virtualenv import main
ImportError: cannot import name 'main'
Can anybody help me with this?
After my upgrade to Fedora 32 I had the same issue which lead me to this question:
ImportError: cannot import name 'main' from 'virtualenv'
In my case I actually seemed to have both /usr/local/bin/virtualenv as well as $HOME/.local/lib/python3.8/site-packages/virtualenv/__init__.py.
Removing the user virtualenv version and reinstalling it into the system with root fixed the issue:
pip uninstall virtualenv
sudo pip install virtualenv
Your virtualenv executable /usr/local/bin/virtualenv is importing the virtualenv package /usr/local/bin/virtualenv.py. My guess is that package is not the one the executable should really be importing. The reason it is choosing that one is because it is in the same directory.
First, check where the real virtualenv package is. In the python3 terminal:
>>> import virtualenv
>>> virtualenv.__file__
If it is not /usr/local/bin/virtualenv.py, then the simplest way to get /usr/local/bin/virtualenv to import it instead of /usr/local/bin/virtualenv.py is to delete /usr/local/bin/virtualenv.py (or so you can easily undo this if it doesn't work, simply rename virtualenv.py to something else like xvirtualenvx.py).
I received this error after upgrading Ubuntu 18.04 LTS to 20.04 LTS. So there were two problems all at once. First the python version was still running 2.x and doing a simple update or try to uninstall (apt-get remove virtualenv) of virtualenv did not help at all. But I found a solution. First let 20.04 LTS 'know' the times of using old python is over:
sudo apt-get install python-is-python3
Then test it and open a console to get the version string with python -V; by now it should be showing something like Python 3.8.5. Fine.
Next step is to solve the virtualenv problem. I tried to find out, which executable was run with which virtualenv and it showed: $HOME/.local/bin/virtualenv. Hmmkay, somehow the system wasn't using the /usr/bin/virtualenv executable. I thought maybe I let the directory become invisible (a.k.a. renaming) and maybe the system will go on a hunt for an alternative virtualenv running:
mv $HOME/.local/bin/virtualenv /home/USER/.local/bin/virtualenv_OLD
Then I simply changed into a playground-directory and ran virtualenv donaldknuth and behold - it worked. To be sure I ran another which virtualenv and the system returned a /usr/bin/virtualenv. Last check to do was activating the new virtual environment:
source $HOME/playground/donaldknuth/bin/activate
The terminal changed and it worked fine. Solution
EDIT:
Based on Pierre B.'s suggestion you may have to restart your Shell. The command hash -d virtualenv will delete the stored location of virtualenv from the shell's cache and determine the correct path right now. (Sources: https://www.computerhope.com/unix/bash/hash.htm, https://unix.stackexchange.com/questions/5609/how-do-i-clear-bashs-cache-of-paths-to-executables)
Similarly to some others here, I had multiple installations of virtualenv. Not sure where the extra one came from, but I had these two:
/usr/local/bin/virtualenv
/usr/bin/virtualenv
One is from apt install of virtualenv, the other from pip install of virtualenv.
This happened when upgrading to Ubuntu 20.04.
On Linux Mint 20, I had to switch default Python interpreter to python3
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 1
Then remove existing virtualenv and reinstall via pip and python3:
rm ~/.local/bin/virtualenv
apt remove python3-virtualenv
sudo pip install virtualenv
Related
This is my first post StackOverflow, I will try to make it as correct and complete as possible if you have any tips to improve my post I will gladly accept it.
I'm having trouble running code written in Python that uses Tkinter.
I will try to describe in detail my actions to facilitate the identification of the error.
I started a course at Coursera on DSP (Digital Signal Processing) where it is suggested to install a tool written in python (and a little bit of C). I'm using Arch Linux.
link on Github:
sms-tools repo
Using pyenv/virtualenv/virtualenvwrapper I created an environment with Python 3.7.5, as recommended in the "How to use" section of the repository.
I installed the required libraries in my environment by pip:
%pip install ipython numpy matplotlib scipy cython
I compiled some C functions in the "/sms-tools/software/models/utilFunctions_C"
directory with the following command:
%python compileModule.py build_ext --inplace
Finally, I run the models GUI in the directory "/sms-tools/software/models_interface"
%python models_GUI.py
and I get the following message:
Traceback (most recent call last):
File "models_GUI.py", line 6, in <module>
from Tkinter import * ## notice capitalized T in Tkinter
ModuleNotFoundError: No module named 'Tkinter'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "models_GUI.py", line 9, in <module>
from tkinter import * ## notice lowercase 't' in tkinter here
File "~/.pyenv/versions/3.7.5/lib/python3.7/tkinter/__init__.py", line 36, in <module>
import _tkinter # If this fails your Python may not be configured for Tk
ModuleNotFoundError: No module named '_tkinter'
I will now describe some of my attempts to solve the problem:
Looking at Tkinter section in Python Wiki I tried installing Tcl and Tk.
%sudo pacman -S tk
but it was already installed. after that I tried installing with pip:
%pip install tk
and
%pip install tkinter
and the error remains the same.
I also tried to create a symlink with this code:
%ln -s /usr/lib/python3.8/lib-dynload/_tkinter.cpython-38-x86_64-linux-gnu.so _tkinter.cpython-38-x86_64-linux-gnu.so
the symlink was created in the following folders:
~/.ve/Coursera_DSP/lib/python3.7/lib-dynload
and
.pyenv/versions/3.7.5/lib/python3.7/lib-dynload
But I still get the same error.
I appreciate it if anyone has any suggestions and I apologize for the language errors since English is not my mother tongue.
After an incessant search on the internet, I believe the problem is related to pyenv and TCL/TK.
I don't understand much about the subject but I suspect that in the creation of the environment by virtualenv python has lost the connection with TCL/TK. Does that make any sense?
Here is step by step guide to make IDLE and tkinter work. Working for me on macOS Catalina. Should be easily adapted to Linux environment:
install tcl-tk with Homebrew. In shell run brew install tcl-tk
in shell run echo 'export PATH="/usr/local/opt/tcl-tk/bin:$PATH"' >> ~/.zshrc
reload shell by quitting Terminal app or run source ~/.zshrc
after reloaded check that tck-tk is in $PATH. Run echo $PATH | grep --color=auto tcl-tk. As the result you should see your $PATH contents with tcl-tk highlighted
now we run three commands from Homebrew's output from step #1
in shell run export LDFLAGS="-L/usr/local/opt/tcl-tk/lib"
in shell run export CPPFLAGS="-I/usr/local/opt/tcl-tk/include"
in shell run export PKG_CONFIG_PATH="/usr/local/opt/tcl-tk/lib/pkgconfig"
if you have your Python version already installed with pyenv then uninstall it with pyenv uninstall <your python version>. E.g. pyenv uninstall 3.8.2
set environment variable that will be used by python-build. In shell run PYTHON_CONFIGURE_OPTS="--with-tcltk-includes='-I/usr/local/opt/tcl-tk/include' --with-tcltk-libs='-L/usr/local/opt/tcl-tk/lib -ltcl8.6 -ltk8.6'"
Note: in future use tck-tk version that actually installed with Homebrew. At the moment of posting 8.6 was the actual
finally install Python with pyenv with pyenv install <version>. E.g. pyenv install 3.8.2
Test
in shell run pyenv global <verion that you've just installed>
now check IDLE. In shell run idle. You should see IDLE window without any warnings and "text printed in red".
now check tkinter. In shell run python -m tkinter -c "tkinter._test()". You should see test window like on the image:
That's it!
My environment:
check this is something went wrong executing steps above:
macOS Catalina
zsh (included in macOS Catalina) = "shell" above
Homebrew (installed with instructions from Homebrew official website)
pyenv (installed with Homebrew and PATH updated according to pyenv official readme from GitHub)
Python 3.8.x - 3.9.x (installed with pyenv install <version> command)
mac Monterey (M1)
brew install python-tk
python 3.9.10
My basic install of linux mint 20 contains python3.
On windows machines this includes the tkinter package.
My solution was to
sudo apt-get install python-tk
or
sudo apt-get install python3-tk
and live was sunny again.
I created a venv using Python 3.10.5 (alternate version to default 3.8). Tkinter failed to install when I used the command "sudo apt-get install python3-tk"; however, when I used "sudo apt-get install python3.10-tk", the module installed properly. Apparently, using the specific python3 version made the difference.
Since I couldn't find any solution I just uninstalled my whole environment system (pyenv pyenv-virtualenv virtualenv and virtualenvwrapper) and installed conda instead. Now everything works.
Probably I messed up with pyenv installation.
Thank you all :D
I installed xcode dev tools first using
%xcode-select --install
then I installed Homebrew using
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
then I did
%brew install python3
%pip3 install pipenv
but when I call
%pip3
I get
% pip3
Traceback (most recent call last):
File "/Library/Developer/CommandLineTools/usr/bin/pip3", line 10, in <module>
sys.exit(main())
TypeError: 'module' object is not callable
This is where it says my pip3 and python3 are located
% which pip3
/usr/bin/pip3
% which python3
/usr/bin/python3
Can someone please help me solve this problem. I am trying to learn to program but I can't continue without fixing this
MacOS Catalina ships with it's own versions of python3 and pip3, so this is probably conflicts between macOS and Brew-installed Python libraries. I solved similar issues by no longer using Brew for anything related to Python.
My recommendation: From a fresh install of Catalina, run sudo pip3 install pipenv. Create a separate directory for each project you work on, and run pipenv shell from that directory every time you work on it. Don't ever bother installing any packages system-wide, and don't overwrite macOS's Python. Anything you do, do inside a Pipenv managed virtual environment -- only install packages via pipenv install <pkg>.
Doing all this will keep the right version of the Python binary and all related packages inside a directory inside ~/.local/share/virtualenvs/ for each project. This way, future macOS updates shouldn't every break dependencies.
I had a similar problem after upgrading to Catalina since I was already using homebrew and Python/pipenv stopped to work as expected. My Python crashed every time, I ran pipenv install with an error described in this developer.apple.com thread. The answer by Mickey Ristroph sounds like a okay'ish workaround, but it doesn't really solve the problem.
I want to be able to use homebrew for all my MacOS installed software - including Python. But there was help, since the problem was the usage of a wrong version libcrypto dylib version. To fix the issue, update & upgrade brew packages and be sure openssl is installed:
brew update && brew upgrade && brew install openssl
Then we create new symbolic links to the homebrew installed libssl.dylib and libcrypto.dylib libraries:
# go to homebrew installed openssl dir:
cd /usr/local/Cellar/openssl/1.0.2t/lib
sudo cp libssl.1.0.0.dylib libcrypto.1.0.0.dylib /usr/local/lib/
cd /usr/local/lib
# if there are links already, you may backup them:
mv libssl.dylib libssl_bak.dylib
mv libcrypto.dylib libcrypto_bak.dylib
# now create new symbolic links:
sudo ln -s libssl.1.0.0.dylib libssl.dylib
sudo ln -s libcrypto.1.0.0.dylib libcrypto.dylib
Now my homebrew installed Python (and pipenv) works like a charm again.
You need to change the raw command used to install libraries and supports in macOS Catalina to this:
python3 -m pip install pipenv
(instead of pip3 install pipenv)
I'm having a ROS-node that uses Python 3.5 and I want to run it on ROS-Kinetic. This is supposed to run on Ubuntu 16.04 with Kernel 4.4.
I've read that it's complicated to match ROS-Kinetic with Python 3 because it's not officially supported...but I've also read that it is possible to do so...
There are several installation guides for specific packages and I've tried some of them but failed everytime.
What I've tried so far:
1) Installed ROS-Kinetic-desktop-full
2) pip3 install rospkg catkin_pkg
3) export PYTHONPATH = /usr/local/lib/python3.5/dist-packages
When I'm running catkin_make, the first error appearing says:
... ImportError: No module named genmsg ...
Can anyone please write an exact installation guide for making ROS-Kinetic run with Python 3.5 (without a virtual environment) or tell me what's missing in my installation?
Thanks in advance!
An alternative to Some progammer's answer, you could install the packages in global space
sudo apt-get install python3-yaml # you'll also need this
sudo pip3 install rospkg catkin_pkg
or add --user flag
pip3 install --user rospkg catkin_pkg
People used Python 3.5 + ROS-Kinetic in Ubuntu before (for example, check out cozmo_driver) and it should work according to REP3.
You are not exporting the right folder to PYTHONPATH. Try
export PYTHONPATH=/opt/ros/kinetic/lib/python2.7/dist-packages/
I have installed Python 3.5 and Pip but When I am type pip or pip3 in console, i get this error
The folder you are executing pip from can no longer be found.
If I run pwd, I get
/home/zahid
Pip was installed using
sudo python /usr/local/lib/python3.5/site-packages/easy_install.py pip
and output that I got was
[sudo] password for zahid:
Searching for pip
Best match: pip 8.1.1
Adding pip 8.1.1 to easy-install.pth file
Installing pip script to /usr/local/bin
Installing pip3.5 script to /usr/local/bin
Installing pip3 script to /usr/local/bin
Using /usr/local/lib/python3.5/site-packages
Processing dependencies for pip
Finished processing dependencies for pip
Can anyone tell me what is going on here
which python3 returns
/usr/bin/python3
which pip returns
/usr/local/bin/pip
which pip3 returns
/usr/local/bin/pip3
echo $PYTHONPATH returns
nothing blank
Regards
Please close this terminal and open a new terminal. You may have deleted some files inadvertently. As a result the terminal is unable to locate some links or environment variables. I faced the same issue. In a new terminal everything went fine.
I had this error on my Mac and restarting fixed this problem for me.
Does sudo pip work?
If so, check to make sure your profile isn't messed up. Check your path variable using the echo command with something like echo $PATH
You need to make sure /usr/local/bin is present in your user profile.
If not, did you install pip into 3.5 and are you accidentally running some other version of python like python 2?
Create a symbolic link using
ln -s /usr/local/bin/pip /usr/bin/pip
test it by running
pip -V
I have created a virtual environment for python3
virtualenv -p /usr/bin/python3 myenv
Everything works ok and pip installs python3 packages. Then I need to upgrade my python3.2 to python3.3. I am using ubuntu 12.04, so I need to do what Luper Rouch suggests here through ppa
I copy /usr/bin/python3.3 into myenv/bin/python3, thus (inside myenv):
python --version
returns Python 3.3.5. But then pip stops working failing with
pip install urllib3
Traceback (most recent call last):
File "mypathtoevn/bin/pip", line 7, in <module>
from pip import main
ImportError: No module named 'pip'
Then I understand that I have to use
pip3.3 install <package_name>
but I can't find any other pip*.* version either globally or inside virtualenv in my system.
How can I get pip3.3 or any other pip version?
Thanks
The ppa you have installed does not contain pip. The python package installer is itself installed with easy_install. On the question you linked to follow the later parts of this answer
Basically, calling
wget http://python-distribute.org/distribute_setup.py
python distribute_setup.py
easy_install pip
should be sufficient. You should use the easy_install command of your Python3.3 install.
Check with
which python
where your python comes from, and search for easy_install in that path. In your case you know where it resides: Your virtualenv.