I'm trying to install opencv using python2.7.
When I use brew install python. I got
Warning: python-2.7.11 already installed, it's just not linked
And then I run brew link python and brew install python again got
1 export PATH="/usr/local/mysql/bin:$PATH"
Warning: python-2.7.11 already installed
But which python still told me I'm using /usr/bin/python.
I changed my ~/.bash_profile to
1 export PATH="/usr/local/mysql/bin:$PATH"
2 #Setting PATH for Python 3.5
3 # The orginal version is saved in .bash_profile.pysave
4 PATH="/Library/Frameworks/Python.framework/Versions/3.5/bin:${PATH}"
5 export PATH
6 # Homebrew
7 export PATH="/usr/local/bin:$PATH"
No thing happens. It seems that I should be using /usr/local/bin/python because opencv is installed by homebrew.
How to solve this?
Did you try closing your terminal session and then open a new one? ~/.bash_profile is only picked up when bash is executed as a login shell, which is the default for Terminal.app when you open a new terminal window. Or you can do source ~/.bash_profile if you do not want to close the terminal session for some reason.
Side note: You might want to add the following at the top of your ~/.bash_profile:
if [ -f ~/.bashrc ]; then
source ~/.bashrc
fi
So that your ~/.bashrc is also executed. Optionally you can also add:
if [ -f `brew --prefix`/etc/bash_completion ]; then
source `brew --prefix`/etc/bash_completion
fi
To enable bash completion for brew commands.
Recent versions of Homebrew and OSX have switched from putting python in /usr/local/bin to /usr/local/opt/python/libexec/bin
You want to do something like:
export PATH="/usr/local/opt/python/libexec/bin:$PATH"
To get the homebrew python.
I changed it to /usr/local/bin like following:
export PATH="/usr/local/python/libexec/bin:$PATH"
Works perfectly for me. That's what I want to use.
Related
What I'm trying to do here is to make python3 as my default python. Except the python 2.7 which automatically installed on mac, I installed python3 with homebrew. This is the website that I'm following. http://docs.python-guide.org/en/latest/starting/install3/osx/#install3-osx
I guess I followed every instruction well, got xcode freshly installed, Command line tools, and homebrew. But here's my little confusion occurs.
The script will explain what changes it will make and prompt you before the installation begins. Once you’ve installed Homebrew, insert the Homebrew directory at the top of your PATH environment variable. You can do this by adding the following line at the bottom of your ~/.profile file
export PATH=/usr/local/bin:/usr/local/sbin:$PATH
I was really confused what this was, but I concluded that I should just add this following line at the bottom of ~/.profile file. So I opened the ~/.profile file by open .profile in the terminal, and added following line at the bottom. And now it looks like this.
export PATH=/usr/local/bin:/usr/local/sbin:$PATH
# Setting PATH for Python 3.6
# The original version is saved in .profile.pysave
export PATH=/usr/local/bin:/usr/local/sbin:$PATH
And then I did brew install python, and was hoping to see python3 when I do python --version.
But it just shows me python 2.7.10. I want my default python to be python3 not 2.7
And I found a little clue from the website.
Do I have a Python 3 installed?
$ python --version
Python 3.6.4
If you still see 2.7 ensure in PATH /usr/local/bin/ takes pecedence over /usr/bin/
Maybe it has to do something with PATH? Could someone explain in simple English what PATH exactly is and how I could make my default python to be python3 when I run python --version in the terminal?
Probably the safest and easy way is to use brew and then just modify your PATH:
First update brew:
brew update
Next install python:
brew install python
That will install and symlink python3 to python, for more details do:
brew info python
Look for the Caveats:
==> Caveats
Python has been installed as
/usr/local/bin/python3
Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
`python3`, `python3-config`, `pip3` etc., respectively, have been installed into
/usr/local/opt/python/libexec/bin
Then add to your path /usr/local/opt/python/libexec/bin:
export PATH=/usr/local/opt/python/libexec/bin:$PATH
The order of the PATH is important, by putting first the /usr/local/opt/python/libexec/bin will help to give preference to the brew install (python3) than the one is in your system located in /usr/bin/python
Before we make the changes, the default version of python in my system was python 2.7.17.
python --version
Python 2.7.17
To make python3 as default python by replacing python2 in Ubuntu.
Open Terminal
cd
nano ~/.bashrc
alias python=python3 (Add this line on top of .bashrc file)
Press ctr+o (To save the file)
Press Enter
Press ctr+x (To exit the file)
source ~/.bashrc OR . ~/.bashrc (To refresh the bashrc file)
python --version
Python 3.7.5
Changing the default python version system wide can break some applications that depend on python2. The alternative solution would be to create an alias.
If you are using zsh (the default on Mac OS) run the following from terminal:
echo 'alias python="python3"' >> ~/.zshrc
echo 'alias pip="pip3"' >> ~/.zshrc
According to this S.O. post, changing the default Python interpreter could possibly break some applications that depend on Python 2.
The post also refers to using aliasing as a solution, and this link might also be a good reference on how to do that.
Personally, I just type "Python3" before I run scripts or go into a shell environment instead of "python".
I just used brew to install Python 3 on OS X. The python3 command now starts the interpreter using brew Python 3.6, but python still opens the interpreter with the default system Python 2.7.
My understanding was that, by default, brew Python should now override system Python. (I.e., see Order of /usr/bin and /usr/local/bin and more in $PATH). In my PATH, /usr/local/bin comes before /usr/bin, so it shouldn't be a PATH issue. I have tried restarting Terminal, with no effect.
Here is my full PATH in case that is relevant.
/Users/**/.rvm/gems/ruby-1.9.3-p362/bin:/Users/**/.rvm/gems/ruby-1.9.3-p362#global/bin:/Users/**/.rvm/rubies/ruby-1.9.3-p362/bin:/Users/**/.rvm/bin:/Users/**/.rvm/bin:/Users/**/Python/PmagPy/programs/conversion_scripts2/:/Users/**/Python/PmagPy/programs/conversion_scripts/:/Users/**/Python/PmagPy/programs:/usr/local/heroku/bin:./bin:/usr/local/sbin:/usr/local/bin:/usr/local/share/npm/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/TeX/texbin:/opt/X11/bin
Why isn't brew Python taking precedence? And how can I fix (or troubleshoot) this? If I can't find another option, I can create an alias, but I prefer to understand what's happening and get to the root of the problem.
Update:
I checked out the "possible duplicate" question, but my issue doesn't appear to be a linking problem:
~ brew link --overwrite --dry-run python
Warning: Already linked: /usr/local/Cellar/python/3.6.4_4
To relink: brew unlink python && brew link python
~
TL;DR Add the following to your .bash_profile (or equivalent):
export PATH="/usr/local/opt/python/libexec/bin:$PATH"
Explanation
It seems python via homebrew is now handled differently (see https://docs.brew.sh/Homebrew-and-Python).
python3 points to Homebrew’s Python 3.x (if installed)
python2 points to Homebrew’s Python 2.7.x (if installed)
python points to Homebrew’s Python 2.7.x (if installed) otherwise the macOS system Python. Check out brew info python if you wish to add
Homebrew’s 3.x python to your PATH.
Checking out brew info python hints at what you need to do:
Unversioned symlinks python, python-config, pip etc. pointing to
python3, python3-config, pip3 etc., respectively, have been
installed into /usr/local/opt/python/libexec/bin
The hint being that you therefore have to add /usr/local/opt/python/libexec/bin before /usr/bin in your path (not /usr/local/bin as stated in some sources e.g. https://docs.python-guide.org/starting/install3/osx/)
See also https://github.com/Homebrew/homebrew-core/issues/15746
One-liner to get homebrew python working:
zsh
echo -n 'export PATH="/usr/local/opt/python/libexec/bin:$PATH"' >> ~/.zshrc && source ~/.zshrc
bash
echo -n 'export PATH="/usr/local/opt/python/libexec/bin:$PATH"' >> ~/.bashrc && source ~/.bashrc
Explanation:
>> filename appends at the end of the file
source filename reloads the file
I tried a few of the proposed solutions in How to link home brew python version and set it as default, but none of them worked. Ultimately I solved this by symlinking python3 --> python:
ln -s /usr/local/bin/python3 /usr/local/bin/python
I have 3 versions of python installed on my Mac. 2 of them are through brew i.e. python2 and python3 while the native version is python. the problem is when I put brew install python it installs python2 and not python. (By saying python means the version which runs on putting that command in terminal). What should I do so that if I type python my brew installed python launches.I have my path variables set correctly and the brew installation path is ahead than that of the usr/bin The problem I am encountering is that I have nltk installed through pip, pip2 and pip3 and when I import nltk in python2 and python3 there is no problem but when I do that in python it show no module found.
Try which python in a terminal to see which python will run. Then you know and can act accordingly to fix it.
ls -lsa $(which python) will let you see if it is a symlink to another location or a real executable. if a Symlink you can see where it points to and so you can follow the breadcrumbs to the final binary used.
if you run python from a terminal and in the python REPL do the following
import sys
print sys.path
you can see to which site-packages locations are pointed.
Other than that you of course have the option to use virtual environments to set up your version of python
if you really want python2 to be the default python command you can add a symlink to your ~/bin folder (create it if it does not exist)
mkdir ~/bin
cd ~/bin
ln -s $(which python2) python
chmod +x python
and make sure that export PATH=~/bin:$PATH is added at the back of your .bashrc or .profile or .zshrc file
Now start a new terminal session and try out python again it should point to brews version
Hope that helps
I have installed python2 and python3 in my Mac osx and currently I'm using python3. And I am able to pip3 install virtualenv and virtualenvwrapper. The problem is whenever I restart my terminal, the settings for virtualenvwrapper don't work, like I can't use the commands mkvirtualenv and workon. The error I get is bash: the command workon is not found. I think there must be something wrong with my settings about the virtualenvwrapper. Here is what I try:
edit the ~/.bashrc:
export WORKON_HOME=~/Envs
source ~/Envs/django_projects/bin/virtualenvwrapper.sh
All my virtualenv packages are installed in the ~/Envs and after that, I source the .bashrc and it works, I could use workon and mkvirtualenv but once I reopen a new terminal it still could find't the workon command.
Does anyone know what's wrong with my setting?
After a few try, finally it works. There are two problems. The first one is because I have both python2 and python3 installed in my machine and by default the virtualenvwrapper try to run using the default python(in /usr/bin/python which is python2) so I have to change it to point to python3. So in my .bashrc file:
export WORKON_HOME=~/Envs
export VIRTUALENVWRAPPER_PYTHON=PATHS/TO/PYTHON3
source ~/Envs/django_projects/bin/virtualenvwrapper.sh
The second one is that .bashrc doesn't run automatically,we have to source in to ./bash_profile. Check https://apple.stackexchange.com/questions/12993/why-doesnt-bashrc-run-automatically for detail.
Then reopen the terminal and ta-da.
In order to be able to use virtualenvwrapper you need to source the script that is somewhere in /Users/mic4ael/Library/Python/{Python version}/bin/virtualenvwrapper.sh. So you could put source /Users/mic4ael/Library/Python/{Python version}/bin/virtualenvwrapper.sh to your .bashrc to make it every time you launch a terminal.
I would like to install Anaconda on a remote server.
The server is running Ubuntu 12.04.
I only have access to this server via SSH.
How can I install Anaconda via the command line?
Something along the lines of:
wget https://repo.anaconda.com/archive/Anaconda3-2020.07-Linux-x86_64.sh
to get the installer for 64 bit linux followed by:
bash Anaconda3-2020.07-Linux-x86_64.sh
You can get the latest release from here
Please take a look at the Anaconda repo archive page and select an appropriate version that you'd like to install.
After that, just do:
# replace this `Anaconda3-version.num-Linux-x86_64.sh` with your choice
~$ wget -c https://repo.continuum.io/archive/Anaconda3-vers.num-Linux-x86_64.sh
~$ bash Anaconda3-version.num-Linux-x86_64.sh
Concrete Example:
As of this writing, Anaconda3-2020.07 is the latest version. So,
~$ wget -c https://repo.anaconda.com/archive/Anaconda3-2020.07-Linux-x86_64.sh
~$ bash Anaconda3-2020.07-Linux-x86_64.sh
P.S. Based on comments, this should also work in CentOS systems.
You can do as Prashant said or you can use bash scripts to automate the installation. Just simply copy and paste depending on the version of Python you want
If you are trying to it entirely in command line you use a bash script
python 2 anaconda install bash script:
# Go to home directory
cd ~
# You can change what anaconda version you want at
# https://repo.continuum.io/archive/
wget https://repo.continuum.io/archive/Anaconda2-4.2.0-Linux-x86_64.sh
bash Anaconda2-4.2.0-Linux-x86_64.sh -b -p ~/anaconda
rm Anaconda2-4.2.0-Linux-x86_64.sh
echo 'export PATH="~/anaconda/bin:$PATH"' >> ~/.bashrc
# Refresh basically
source .bashrc
conda update conda
python 3 anaconda install bash script
# Go to home directory
cd ~
# You can change what anaconda version you want at
# https://repo.continuum.io/archive/
wget https://repo.continuum.io/archive/Anaconda3-4.2.0-Linux-x86_64.sh
bash Anaconda3-4.2.0-Linux-x86_64.sh -b -p ~/anaconda
rm Anaconda3-4.2.0-Linux-x86_64.sh
echo 'export PATH="~/anaconda/bin:$PATH"' >> ~/.bashrc
# Refresh basically
source .bashrc
conda update conda
Source: https://medium.com/#GalarnykMichael/install-python-on-ubuntu-anaconda-65623042cb5a
Download Anaconda for linux, place in your ubuntu system through WinScp, then
$ sudo bash Anaconda2-4.3.0-Linux-x86_64.sh
after this logout of your ssh session and then login, you will get base environment.
1 - Go to Anaconda Repository, find the installation for your OS and copy the address
2 - wget {paste}. Ex: https://repo.continuum.io/archive/Anaconda3-5.2.0-Linux-x86_64.sh
3 - Execute with: bash. Ex: bash Anaconda3-5.2.0-Linux-x86_64.sh
Run!
$ sudo bash Anaconda2-4.3.0-Linux-x86_64.sh
Video tutorial::
https://youtu.be/JP60kTsVJ8E
Just download the anaconda installer and execute it as it is a shell script. Follow the steps :
In the terminal type "wget https://repo.continuum.io/archive/Anaconda-2.3.0-Linux-x86_64.sh"
The file will be downloaded in current directory. Now execute the downloaded file by "bash ./Anaconda-2.3.0-Linux-x86_64.sh"
Restart the terminal. This is very important for python version provided by anaconda to be set to default for that user.
Note- Try using environment for using different version of python. Changing the default python version for root might result in non functioning of some functionalities like yum.