In preparation for supporting a Python 2 legacy application I just installed Ubuntu 18.04.5, which includes Python 3 but not Python 2. Pretty much every Python 2 install tutorial website shows the following command for installing Python 2:
sudo apt-get install python2
Upon which I get:
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package python2
Some sites list these commands first so I tried these as well:
sudo apt-get install software-properties-common
sudo add-apt-repository universe
sudo apt-get update
sudo apt-get install python2
This gives the same results as above.
I setup Ubuntu 20.04 on a different computer and installed Python 2 about a month ago and I could swear I used the same commands and at that time it worked. I also remember something about Python 2 being decommissioned at the end of January 2021 (which just passed).
Was the Python 2 pip package taken down? Is there some way I can verify this? If so, is there some special curl command that can still download Python 2 or a website I can download it from?
After searching the Ubuntu packages, it seems that for some odd reason for Ubuntu 20.04 the name of the Python 2 package is python2 but for Ubuntu 18.04 there is no package named python2. It seems that for Ubuntu 18.04 by running:
sudo apt-get install python-pip
This installs both pip for Python 2 and Python 2 itself, so this seems to be the best option
Related
I tried installing the libdouble-conversion-dev package using sudo apt-get install libdouble-conversion-dev but failed with the following output:
Package libdouble-conversion-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'libdouble-conversion-dev' has no installation candidate
I have also tried running sudo apt-get update beforehand and got the same results, as well as installing from the debian file from https://packages.debian.org/buster/amd64/libdouble-conversion-dev/download but nothing seemed to have changed.
You can manually install a Debian package on a compatible Ubuntu host with sudo dpkg -i $name_of_package_file.
I have Python3.8 built from source on my Debian 10 Xfce desktop (binaries are not available in Debian repositories). That said, whenever I can, I run my python scripts with pypy3, which I do for the sake of performance.
Now, when I run the following code with pypy3 :
#!/usr/bin/env python3.8
import requests
from bs4 import BeautifulSoup
url = input("What is the address of the web page in question?")
response = requests.get(url)
soup = BeautifulSoup(response.text, 'html.parser')
print(soup.title.string)
I get from pypy3:
ImportError: No module named 'requests'
The same script is run by Python3.8 without any problems
I assume that I would have to install the module in a similar way that I did it for Python, that is: sudo pip3.8 install requests.
Based on my research of a similar problem described on Stackoveflow I tried:
pypy3 -m pip3.8 install requests
and got the following from my pypy3:
Error while finding module specification for 'pip3.8' (ImportError: No >module named 'pip3')
Then I also tried to run:
pypy3 -m pip install requests
And got the following:
No module named pip
My pip3.8 works fine for Python3.8, not for my pypy3, though.
How should I look for modules in pypy3. And how should I install them?
Is the problem with installing and importing modules one of the reasons reason for the low usage of pypy3?
Run this once to install pip itself: pypy3 -m ensurepip
The next version of PyPy will improve the error message to describe this command explicitly when you do pypy3 -m pip and pip is not installed yet.
pypy3
Enable snaps on Debian and install pypy3
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Enable snapd:
sudo apt update
sudo apt install snapd
Install pypy3:
sudo snap install pypy3 --classic
Normally, the pip and package are installed as follows
First of all, you need to install the pip
Install pip for Python 3
Follow the steps below to install Pip for Python 3 on Debian:
First, update the package list with:
sudo apt update
Next, install pip for Python 3 and all of its dependencies by typing:
sudo apt install python3-pip
Verify the installation by printing the pip version:
pip3 --version
The version number may be different, but it will look something like the one below:
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.5)
Pip Usage
With pip, we can install packages from PyPI, version control, local projects, and from distribution files but in most cases, you will install packages from PyPI.
we want to install a package named croniter, we can do that by issuing the following command:
pip install requests
To uninstall a package run:
pip uninstall requests
I am trying to run some python script using ssh to log into the google compute engine but all the installed pip modules are not found as I do not have permission to the .cache/pip folder in my user is there a correct way to do this?
You should be running this with the root user.
Also, if you need pip inside your GCP Instance, you can use the following commands:
sudo curl "https://bootstrap.pypa.io/get-pip.py" -o "get-pip.py"
sudo python get-pip.py
[Source]
Use:
sudo apt-get install python3-pip
sudo runs this command as an administrator
apt-get is the standard package manager used on Debian Linux distributions
python3-pip is the package name for pip3
Once installed, you can install PIP modules with:
pip3 install MODULE_NAME
for example:
pip3 install tensorflow
I'm not entirely sure there is one correct way to do this, but an easy way would be to use the conda python package manager.
The lighter version of it is miniconda. You can get a minimal python installation with pip preinstalled, and virtual environments capability if you need. Assuming you are running on linux and want python 3, you'll have to run
wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh
and then install conda with
bash Miniconda3-latest-Linux-x86_64.sh
At the end of this process you should have a minimal python installation (that includes pip) and you'll be able to install packages with pip as you are used to.
You might want to install some basic libraries first -
sudo apt-get install bzip2 libxml2-dev
Then install miniconda as given by #teoguso and restart your shell
source ~/.bashrc
You can then use conda or pip to install your packages
I want to install TensorFlow framework to try my MNIST model (a deep neural network to recognize digits) on NAO! I downloaded OpenNAO OS virtual machine in the terminal I tried the commands
$ sudo apt-get install python-pip python-dev $ sudo pip install --upgrade https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.8.0-cp27-none-linux_x86_64.whl
i got this err! "- bash: apt-get: command not found"
what should I do? Thank you
TensorFlow
OpenNao runs on linux but not on ubuntu. It runs on Gentoo, the commands are different.
CentOS 7 EPEL now includes Python 3.4: yum install python34
However, when I try that, even though Python 3.4 installs successfully, it doesn't appear to install pip. Which is weird, because pip should be included by default with Python 3.4. which pip3 doesn't find anything, nor does which pip.
How do I access pip from the Python 3.4 package in CentOS 7 EPEL release?
The easiest way I've found to install pip3 (for python3.x packages) on CentOS 7 is:
$ sudo yum install python34-setuptools
$ sudo easy_install-3.4 pip
You'll need to have the EPEL repository enabled before hand, of course.
You should now be able to run commands like the following to install packages for python3.x:
$ pip3 install foo
curl https://bootstrap.pypa.io/get-pip.py | python3.4
Or if you don't have curl for some reason:
wget https://bootstrap.pypa.io/get-pip.py
python3.4 get-pip.py
After this you should be able to run
$ pip3
The CentOS 7 yum package for python34 does include the ensurepip module, but for some reason is missing the setuptools and pip files that should be a part of that module. To fix, download the latest wheels from PyPI into the module's _bundled directory (/lib64/python3.4/ensurepip/_bundled/):
setuptools-18.4-py2.py3-none-any.whl
pip-7.1.2-py2.py3-none-any.whl
then edit __init__.py to match the downloaded versions:
_SETUPTOOLS_VERSION = "18.4"
_PIP_VERSION = "7.1.2"
after which python3.4 -m ensurepip works as intended. Ensurepip is invoked automatically every time you create a virtual environment, for example:
pyvenv-3.4 py3
source py3/bin/activate
Hopefully RH will fix the broken Python3.4 yum package so that manual patching isn't needed.
Update: The python34 bug mentioned below has finally been fixed. It is a perfectly fine choice now.
Rather than using broken EPEL python34 packages, you can enable the IUS repo and have it work properly.
pip inside virtual environments
The main python34u and python35u IUS packages include the pyvenv tool (/usr/bin/pyvenv-3.4 or /usr/bin/pyvenv-3.5) that includes bundled wheels of pip and setuptools for bootstrapping virtual environments.
global pip
The python34u-pip and python35u-pip IUS packages include /usr/bin/pip3.4 and /usr/bin/pip3.5 respectively. These work just fine to install packages to the system site-packages directory.
yum install python34-pip
pip3.4 install foo
You will likely need the EPEL repositories installed:
yum install -y epel-release
Update 2019
I tried easy_install at first but it doesn't install packages in a clean and intuitive way. Also when it comes time to remove packages it left a lot of artifacts that needed to be cleaned up.
sudo yum install epel-release
sudo yum install python34-pip
pip install package
Was the solution that worked for me, it installs "pip3" as pip on the system. It also uses standard rpm structure so it clean in its removal. I am not sure what process you would need to take if you want both python2 and python3 package manager on your system.
Below are the steps I followed to install python34 and pip
yum update -y
yum -y install yum-utils
yum -y groupinstall development
yum -y install https://centos7.iuscommunity.org/ius-release.rpm
yum makecache
yum -y install python34u python34u-pip
python3.6 -v
echo "alias python=/usr/bin/python3.4" >> ~/.bash_profile
source ~/.bash_profile
pip3 install --upgrade pip
# if yum install python34u-pip doesnt work, try
curl https://bootstrap.pypa.io/get-pip.py | python
There is a easy way of doing this by just using easy_install (A Setuptools to package python librarie).
Assumption.
Before doing this check whether you have python installed into your Centos machine (at least 2.x).
Steps to install pip.
So lets do install easy_install,
sudo yum install python-setuptools python-setuptools-devel
Now lets do pip with easy_install,
sudo easy_install pip
That's Great. Now you have pip :)
Figure out what version of python3 you have installed:
yum search pip
and then install the best match. Use reqoquery to find name of resulting pip3.e.g
repoquery -l python36u-pip
tells me to use pip3.6 instead of pip3
On CentOS 7, the pip version is pip3.4 and is located here:
/usr/local/bin/pip3.4