I know this question has been asked - but none of the solutions there seem to be working. I recently found out that on Mac OS, the native installation of python isn't very good. So, I installed homebrew, and installed Python 2 through there. My path is as follows:
~ echo $PATH
/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/TeX/texbin
However, I still get the following:
~ which python
/usr/bin/python
~ which python2
/usr/local/bin/python2
It's also probably important to note that my ~/.bash_profile, ~/.profile and ~/.zshrc files are empty.
Somehow, I think I got pip to work with the python2 (homebrew) installation. Basically, I did pip install pandas and I get the following outputs for the two python interpreters:
~ python
Python 2.7.10 (default, Feb 7 2017, 00:08:15)
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.34)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named pandas
That is, it doesn't appear with the default python installation. However, I also have the following:
~ python2
Python 2.7.14 (default, Sep 25 2017, 09:53:22)
[GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.37)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas
>>>
So, pandas is imported in the python2 (homebrew) python, but not the standard one. How can I get it so that the default python is my homebrew python? I also read somewhere that brew link python would work, but when I do that I get
~ brew link python
Warning: Already linked: /usr/local/Cellar/python/2.7.14
To relink: brew unlink python && brew link python
I want to be able to just use python my_file.py and have it use the homebrew installation. (Not sure if it's related, but hopefully this would also allow Sublime to use the homebrew install when I hit command + B).
Sorry for the long post, new computer and I'm trying to get this all correct before I do any big projects and find out halfway through that things aren't working the way I need them to.
Thanks!
The macOS system Python is installed at /usr/bin/python. This is the only one called python on your path.
Homebrew doesn't create a link for python in /usr/local/bin. If you want one you can create it yourself:
ln -s /usr/local/bin/python2 /usr/local/bin/python
Alternatively, just update your shebang lines to specify python2 or python3, which is probably better anyway (explicit is better than implicit).
Related
Typing Python on my Terminal shows
Python 3.9.5 (default, May 4 2021, 03:36:27)
[Clang 12.0.0 (clang-1200.0.32.29)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
When in fact I have installed the latest version, 3.10.6, which shows when I type python3 --version. Typing just python --version returns 3.9.5 again.
It seems that the default version is 3.9.5 and not updated, or am I wrong? Either way, how do I solve this? I've tried both downloading and installing it directly, as well as through brew install ..., both giving successful installs, but not updating the default version (3.9.5 -> 3.10.6)
The solution, as provided in the comments, was to create a ~/.zshrc file (How to create a ~/.zshrc file) and then to replace the existing path with export PATH="$(brew --prefix python#3.10)/libexec/bin:$PATH"
I am using paraview 4.3.1 in Centos 7. There is a built-in python named pvpython:
Python 2.7.2 (default, Jan 15 2015, 09:36:49)
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys;sys.path
['', '/tmp/ParaView-4.3.1-Linux-64bit/lib/paraview-4.3/site-packages/vtk', '/tmp/ParaView-4.3.1-Linux-64bit/lib/paraview-4.3/site-packages', '/tmp/ParaView-4.3.1-Linux-64bit/lib/paraview-4.3', '/tmp/ParaView-4.3.1-Linux-64bit/lib/paraview-4.3/lib/python27.zip', '/tmp/ParaView-4.3.1-Linux-64bit/lib/paraview-4.3/lib/python2.7', '/tmp/ParaView-4.3.1-Linux-64bit/lib/paraview-4.3/lib/python2.7/plat-linux2', '/tmp/ParaView-4.3.1-Linux-64bit/lib/paraview-4.3/lib/python2.7/lib-tk', '/tmp/ParaView-4.3.1-Linux-64bit/lib/paraview-4.3/lib/python2.7/lib-old', '/tmp/ParaView-4.3.1-Linux-64bit/lib/paraview-4.3/lib/python2.7/lib-dynload', '/tmp/ParaView-4.3.1-Linux-64bit/lib/paraview-4.3/lib/python2.7/site-packages']
>>>
The problem is, original pvpython do not support many useful features such as code completion. And there is no setup_tools in the pvpython, so I cannot install new modules to the built-in python.
Could anyone help me to install ipython on this built-in python?
See the install instructions for get-pip:
https://pip.pypa.io/en/latest/installing.html
However, you must use the pvpython instead of python when using the install instructions.
Depending on how you install it, you may end up with more than one easy_install or pip on your path. Just make sure you're using the one associated with pvpython - look at the script you're running to find out (it's just a shell script).
Once you've done that, installing ipython should be the same as installing it with any other version of python (assuming that pvpython doesn't break anything that ipython needs).
I found that Python on my Mac build with narrow-build which will raise character range error when i use the re model.
So I want to install the wide-build in my Mac.So how can I install Python with wide-build on Mac?
If you really need a "wide build" of Python 2 on OS X to support Unicode code points above 0xffff, you'll probably have to build it yourself from source. Most distributions for OS X that I am aware of use the default "narrow build"; one exception is MacPorts which does support a wide-build variant:
sudo port install python27 +ucs4
To build Python yourself from source, download and unpack the latest Python source tarball and set appropriate configure arguments for your situation. The key one is --enable-unicode=ucs4. For example, a minimal configuration might be:
curl -O https://www.python.org/ftp/python/2.7.8/Python-2.7.8.tgz
tar xf ./Python-2.7.8.tgz
cd ./Python-2.7.8
./configure --enable-unicode=ucs4 --prefix=/path/to/install MACOSX_DEPLOYMENT_TARGET=10.9
make
make install
cd
/path/to/install/bin/python2.7
Python 2.7.8 (default, Aug 3 2014, 22:27:28)
[GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.maxunicode
1114111
As noted by Jason, current Python 3 releases always support all Unicode characters.
If using Python3 upgrade to the latest version. In 3.3 and later:
The distinction between narrow and wide Unicode builds is dropped.
http://legacy.python.org/dev/peps/pep-0393/
I am trying to use twisted on OS X Mavericks, but I get this error message when I try to import it.
christohersmbp2:~ christopherspears$ python
Python 2.7.6 (default, Mar 8 2014, 09:29:01)
[GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.2.79)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import twisted
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named twisted
My guess is that I am receiving this error because I am not using the default Python. I am using a Python installed with brew. Ideally, I would want to install twisted into a virtual environment to play with, but the docs are seriously lacking in details. Apparently, a dmg exists for Mac OS X 10.5, which is not helpful for me. I can install from the tarball into the virtual environment, but I am not sure how to do this. Any hints?
If you're using virtualenv, it doesn't matter whether you are using the system python or not.
Simply pip install twisted in your virtualenv, like:
$ workon MyTwistedEnv
$ pip install twisted
Currently, due to a bug in Xcode that affects all projects which contain extension modules, you may need to spell this
$ CFLAGS= pip install twisted
instead; hopefully this will be fixed soon. It may not affect brew installed Pythons, however.
I thought I'd move from using Tkinter to wxPython, but I'm having some troubles. All I get is this:
>>> import wx
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named wx
I have installed wxPython. When I run the uninstaller I clearly see that wxPython IS installed:
1. wxPython3.0-osx-cocoa-py2.7 3.0.0.0
Enter the number of the install to examine or 'Q' to quit:
When I start Python I see that my version should match the version of wxPython:
Python 2.7.1 (r271:86832, Jul 31 2011, 19:30:53)
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
I'm on OS X 10.7.5 32-bit.
Any help would be awesome! :)
Macs can have multiple versions of Python installed. Are you sure that you installed wxPython for the same python you invoke with the interpreter?
Try, which python, and make sure that this version of python has a wxredirect.pth file in site-packages pointing to the wxPython installation. (If it doesn't search for wxredirect.pth.)
Here's one version on my system...
> which python2.6
/Library/Frameworks/Python.framework/Versions/2.6/bin/python2.6
> more /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/wxredirect.pth
import site; site.addsitedir('/usr/local/lib/wxPython-3.0.0.0/lib/python2.6')
#import site; site.addsitedir('/usr/local/lib/wxPython-2.9.1.1/lib/python2.6')
#import site; site.addsitedir('/usr/local/lib/wxPython-unicode-2.8.12.1/lib/python2.6')
Here, btw, I can comment out lines in the wxredirect.pth to choose the version of wxPython I want to use.
I just find the same problem.
I used brew install wxpython to install it on mac.
I try the method above but no use.
I happen to find the solution when I install another package, it showen below:
brew install tbb
Downloading https://homebrew.bintray.com/bottles/tbb-2017_U7.sierra.bottle.t
############################################################ 100.0%
==> Pouring tbb-2017_U7.sierra.bottle.tar.gz
==> Caveats
Python modules have been installed and Homebrew's site-packages is not
in your Python sys.path, so you will not be able to import the modules
this formula installed. If you plan to develop with these modules,
please run:
mkdir -p /Users/ningrongye/.local/lib/python2.7/site-packages
echo 'import site; site.addsitedir("/usr/local/lib/python2.7/site-
packages")' >> /Users/ningrongye/.local/lib/python2.7/site-
packages/homebrew.pth`
this is what homebrew said and I just try those, and it works.
ningrong
I have Python 2.7 and 3.7 .
In /usr/local/bin/ there are symbolic links for 2.7 and 3.7 Python versions and also symbolic links for pip.
I've installed wxPython with pip3
pip3 install -U wxPython
Then i checked the installation for Python3
myname$ python3
Python 3.7.2 (v3.7.2:9a3ffc0492, Dec 24 2018, 02:44:43)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import wx
>>> wx.version()
'4.0.4 osx-cocoa (phoenix) wxWidgets 3.0.5'
Antonio
In my case it worked by resetting the brew environment to 2.7:
brew link --overwrite python#2