I'm running openSUSE 13.2. I already had python 2.7.8 and python 3.4.x. I ran into a situation where a business server was running python 2.6. I wanted to make a virtualenv, but I need to install the specific version first. I couldn't find python 2.6 in yast and I wasn't getting any hits when I was search for stuff in zypper.
So I downloaded the tar ball from python's download page for python 2.6.6 and followed the directions in the readme
./configure
sudo make install
This worked, but it changed my default python interpreter in the process. I worked through that and now things are fine. But I might want to install a different python version in the future without having to worry about it changing my default interpreter. I'm pretty sure there's more I could do on my own, but I need to move on to something else and I'm wondering if anybody was some quick feedback on what I've done so far and what I should do in the future.
If you need to maintain distinct versions simultaneously, it's best to install each in its own tree. configure takes an optional --prefix=/path/to/installation/root argument.
At one site, we would install an add-on software package in something like /opt/local/x86_64-linux-gnu/python-2.6.6. Users who need this specific version can then add /opt/local/x86_64-linux-gnu/python-2.6.6/bin to their $PATH, or use virtualenv or GNU stow.
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I'm a python noob working through this intro to python: https://www.youtube.com/watch?v=rfscVS0vtbw. (definitely no need to watch this. Just adding it as context)
It's been going really well, except now I'm up to the part where I need to use pip, and despite having downloaded version 3.8 of Python, it keeps telling me that it doesn't even have pip installed.
I'm wondering if anyone could walk me through what the issue might be and how to actually start using pip in PyCharm.
I've tried downloading pip and installing it but even that doesn't seem to work. If anyone has an ultra-hand-holdy solution (very much for a noob) that would be appreciated.
I feel like the problem might be that I'm putting things in the wrong directories or something? Obviously there are some built-in versions on Python (2.x) already on the Mac so maybe they are interfering?
Thanks in advance for your help.
If I recall correctly, the version of Python that is used when you use the command python is the 2.x version, which doesn't have pip. So if you want to use python in terminal, you should call it as python3 and pip3 for using the pip command.
If you want to set a different Python version as the default one, you can do that. Here is a tutorial that can get you started with that (there's a plethora of other tutorials if this one isn't clear enough): https://opensource.com/article/19/5/python-3-default-mac
For using PyCharm specifically, you can setup the Python interpreter that is used with PyCharm by going to Preferences(or Settings) -> Project:[name of your project] -> Project Interpreter and then chose the desired Python Interpreter from the drop down menu. You can also create a virtual environment there by clicking on the cog icon and choosing Add. This is the preferred way and very convenient to keep installed packages local to your project. After you're done with that, open up PyCharms terminal (at the bottom of your PyCharm window) and you should be able to normally use pip with the command pip.
Alternatively, you can install Python packages in PyCharm using their built in package manager that you can find in the same window where you set your Python Interpreter. Below the dropdown menu you'll see a + sign, where you can click to add packages.
I don't know how I've gotten here but I have many competing installations of python on my Ubuntu 16.04 path. Some I use, some I don't.
I'm at the point now where I want to clean up things to save headache when troubleshooting issues but I don't know any strategies or tools of tackling this.
What is the best way I can find out which environments are being used and not used?
How can I determine which python directories are being pointed to and which ones are abandoned?
Whats a quick way I can get a list of non-standard packages installed to each environment?
Here is what you can try
which python usually for python2.x and which python3 for python3.x.
Then decide which version you want to use by default then you can use export python='Your required python interpreter path' for permanent changes, or you can use alias python=PATH for temporary usage.
Also see where the pip and pip3 are pointing at by using which pipX. Thus you can use one of them to install required packages.
I would recommend you to use virtualenv or pipenv so that you get more fine grained control over the interpreter selection according to the need of your project.
Note do not uninstall any of the above python packages without some research as there might be system dependencies thus breaking your system.
In this SO post I outlined my problems, and I would like to try and solve them by getting rid of all my downloaded python launchers, modules, versions, pip etc (for python 2 & 3) and start afresh. My only problem is that macOS comes pre-loaded with python 2 and I don't think I can or should get rid of that, but I do have other versions of python 2 installed that I do want to delete.
Is there any help that you can offer that will tell me what to delete and what not to?
Should I need to use 'sudo' at all during my uninstalling?
Are there any tests to ensure certain things are completely gone?
Please keep answers fairly simple to understand implement.
When I reinstall the things I need, is it better to do it all via home-brew, then pip; instead of downloading from safari, unless necessary?
If you installed using sudo (or typed your password into an installer), you'll need this to uninstall too. Mac python is in /usr/bin/python and /usr/lib/python*. Yes it can be good to install via homebrew, although I've had good success with the Anaconda distro of Python. The important thing is setting you PATH and PYTHONPATH variables in ~/.profile or ~/.bash_profile so that it sees your custom installed Python before it sees the system install.
I want to configure Emacs24 for python development. So far I've fallowed the instructions in this blog post and done all the steps successfully, but nothing happened when I reopened Emacs. It's maybe because the blog post is a little out of date (May 2011) and it has been tested on Emacs23. does anybody have any better instructions? preferably tested recently on Emacs24.
What I need most is auto-complete for python (version >3), and django after that.
By the way I'm using LinuxMint14 if it is any important.
It's probably best to install things from one of the repositories. pymacs and pyflakes are both in MELPA. This repo also has the flymake-python-pyflakes - which is kind of an extension of the snippet in the blog post.
You will probably have very little use for ropemacs at first because that's not intended for Python development proper, it's for extending Emacs with Python (rather than Emacs Lisp).
So, I'd say, first add this:
(add-to-list 'package-archives
'("melpa" . "http://melpa.milkbox.net/packages/") t)
(add-to-list 'package-archives
'("marmalade" . "http://marmalade-repo.org/packages/"))
(package-initialize)
to your Emacs init file (usually ~/.emacs), evaluate it with M-xeval-buffer. Then M-xlist-packages, search for Pymacs, pyflakes, auto-complete and whatever you like. Pressing RET on package name will open a buffer with package description. Pressing i on package name will schedule it for installation, pressing x will install all packages scheduled for installation.
Also note that ropes is a Python library needed for many code-related tasks in various editors. So you'd need to install that too, sooner or later. Usually, if you have Python installed, you'd already have pip program, so I'd suggest you do:
$ pip install rope ropemacs
It will be probably:
$ pip3 install rope_py3k
(I'm guessing from the package name).
Rather than installing it by hand. If pip isn't installed by default:
$ sudo apt-get install pip
(it could be also named python-pip, at least this is the name on RHEL distros). Also on RHEL there are two different versions, python-pip and python-pip3, the other one being for Python 3.X I believe, so install whichever is appropriate.
The benefit of using an installer of this kind is that it will do all the maintenance job in the way that others can anticipate, and so would be able to help if need be.
There are also lots of Python-related bits of Emacs Lisp code floating around. I'd suggest you check out https://github.com/jorgenschaefer/elpy/wiki (installable through MELPA). MELPA also lists PyDE support: http://pyde.bitbucket.org/ but I don't know what it is.
I have a linux VPS that uses an older version of python (2.4.3). This version doesn't include the UUID module, but I need it for a project. My options are to upgrade to python2.6 or find a way to make uuid work with the older version. I am a complete linux newbie. I don't know how to upgrade python safely or how I could get the UUID modules working with the already installed version. What is a better option and how would I go about doing it?
The safest way to upgrading Python is to install it to a different location (away from the default system path).
To do this, download the source of python and do a
./configure --prefix=/opt
(Assuming you want to install it to /opt which is where most install non system dependant stuff to)
The reason why I say this is because some other system libraries may depend on the current version of python.
Another reason is that as you are doing your own custom development, it is much better to have control over what version of the libraries (or interpreters) you are using rather than have a operating system patch break something that was working before. A controlled upgrade is better than having the application break on you all of a sudden.
The UUID module exists as a separate package for Python 2.3 and up:
http://pypi.python.org/pypi/uuid/1.30
So you can either install that in your Python2.4, or install Python2.6. If your distro doesn't have it, then Python is quite simple to compile from source. Look through the requirements to make sure all the libraries you need/want are installed before compiling Python. That's it.
The best solution will be installing python2.6 in the choosen directory - It will you give you access to many great features and better memory handling (infamous python=2.4 memory leak problem).
I have got several pythons installed onto my two computers, I found that the best solution for are two directories:
$HOME/usr-32
$HOME/usr-64
respectively to using operating system (I share $HOME between 32 and 64 bit versions of Linux).
In each I have one directory for every application/program, for example:
ls ~/usr-64/python-2.6.2/
bin include lib share
It leads completetely to avoiding conflicts between version and gives great portability (you can use usb pendrives etc).
Python 2.6.2 in previously example has been installed with option:
./configure --prefix=$HOME/usr-64/python-2.6.2