I got this error even though I did install the PyQt5 package (yesterday, it worked normally)
and then I find the location of the site-package python, but nothing there? Not even a single one (I did install many packages yesterday)
I try to reinstall with homebrew and pip, and in both cases, it noticed that my package was installed (for homebrew, it said that I have to reinstall instead of using install since the package was already there)
When I check, there is only one folder of python so there was no misunderstanding about the python package in this case.
Can someone tell me why did it happen and how to solve it?
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Overview: While running Python 3.6, after upgrading my arcgis package, scripts no longer recognizes many packages and pip itself completely broke, making it impossible to upgrade or uninstall any packages.
Background Info: Fairly recently, when I run a particular program of mine, I have been seeing a deprecation message connected to the arcgis package. So, I upgraded the arcgis package to see if it fixed it. It seemed to install correctly but then when trying to run my program, I'd get errors for other packages, like folium or requests. I then tried upgrading Python and initially, it worked. I used pip to install pandas and requests but right after I installed arcgis, everything broke again. So then when trying to uninstall arcgis (or do anything else pip related) I get this error:
FileExistsError: [WinError 183] Cannot create a file when that file already exists: 'C:\Users\myuserpath\AppData\Local\.certifi'
I've uninstalled Python but it doesn't change anything. pip install any package results in this error. I tried reverting back to Python 3.6 but the installer wasn't available from the python site, only 3.9.
What could have been changed or affected by this arcgis installation?
There seems to be two primary issues you're dealing with. The first is as #BoarGules mentioned, that arcgis does a 'full' install with all its dependencies and that could be causing problems. Secondly, the newest requests library seems to have some issues as well, at least from what I've experienced. So let's get started fixing all this.
There's probably a few different ways to fix this, so this is just one of the many. First, uninstall python and delete the python folder from your AppData folder - in your case, it would be the Python 3.9 folder. Re-install Python and check your site-packages folder making sure it only contains the default Python packages. Open up a command prompt and do a pip install of something basic, like pandas. If that goes well, then the first hurdle is over.
When it comes time to install arcgis again, you'll want to use this instead
pip install arcgis --no-deps
this will prevent the doubling up of any of the packages or whatever seems to be happening. You will need to then also install these:
pip install ujson
pip install requests_ntlm
Next, when you come to installing requests, use an older library, like this one:
pip install requests==2.20.0
That should get things back up and running.
I am relatively new to Python so please pardon my ignorance. I want to know answer to following questions
How does pip know the location to install packages that it installs? After a built of trial and error
I suspect that it maybe hardcoded at time of installation.
Are executables like pip.exe what they call frozen binaries? In essence, does it mean that pip.exe will run without python. Again after a bit of trial and error i suspect that it requires a python installation to execute.
P.S: I know about sys.prefix,sys.executable and sys.exec_prefix. If there is anything else on which the questions i asked on depends, pls link me to same.
PIP is a package manager for Python packages, or modules if you like.
pip when used with virtualenv will generally install packages in the path /lib//site-packages.
For example, I created a test virtualenv named test, and the django folder is in test/lib/python3.7/site-packages/django.
At the time of installation, you must have set up environment variables, and that is how pip recognizes directories.
pip.exe which is placed under path\Scripts needs a python installation and can't run without one. It is hardwired against a specific python interpreter, and can't install packages for another one. If you have 7 different python versions installed on your system, you will also have 7 different versions of pip.
Since it is bound so tightly, pip was at some point even included with the python standard library (see pep-0453 for details).
This also answers the other part of your question of how pip figures out the right location - there is only one location it can install to, the side-packages of the python interpreter it is bundled against.
My python installation is a mess.
Therefore I'd like to reinstall the entire installation of it. (Unfortunately,) I've also installed QGIS and PyCharm (mostly making it a mess) and I want to start clean..!
So, what is the best way to get rid of every little python thingy and what are the best packages/methods for reinstalling Python27, QGIS and PyCharm? Should I go for osgeo or not, should I first install Pycharm or Python etc. Hopefully you have some good thoughts and tools on this. I'm a fan of pip, so in the end I hope its possible just to use pip for installing the packages all around.
I'm working on Windows 7, 64bit (thanks for the headsup Karel)
Go to add/remove programs in windows and uninstall everything. Then reinstall everything. Do your Python install first and PyCharm should detect everything. I'd suggest doing the 32 bit Python install as some packages aren't compiled for 64 bit and it makes things a bit challenging to find and install them.
Pip is standard in the python install now. You'll see a check box in the installer for it, which is pre-checked. I'd change your install directory to something simple like C:\Python27
Other than that it should be pretty straightforward. However I doubt you really need to uninstall Python. You can just go to settings and under the interpreter section add the C:\Python27 directory. PyCharm is constantly scanning for installed modules, so it will know in real time that you've installed them. You can even install packaged via PIP while PyCharm is open and within second PyCharm will recognize it as a valid package.
If you're missing packages you can also import them in PyCharm and when you get the red underline saying it's missing, hover your mouse over it and hit alt+enter and you'll get a menu to install it.
I've followed this tutorial to make a package with namespace. Then I use pip install xxx.tar.gz to install and everything works like expect.
The problem is that my environment has already a lots of packages with the same namespace and installed with easy_install and eggs, and python can not find the old packages anymore. I understand that if I create tar.gz instead of eggs for all the olds pacakges, it would work fine but this is a lots of time to spend.
How can I make the new and old packages work together with two different installation methods ?
Thanks
I just ran into the same problem (I think). It appears that this is a well known problem. The solution given to me was to just use pip for everything. I was specifically using python setup.py install alongside pip install w/e and it wasn't working, I'm guessing yours is roughly the same problem.
I have installed Python using Homebrew. I would like for this installation of python to recognize only one site-pakages directory -- /usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages
However, when I start the python shell and give the command print [f for f in sys.path if f.endswith('packages')] I get the following output:
['/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages', '/Library/Python/2.7/site-packages']
Why is /Library/Python/2.7/site-packages sitting at the end there? Shouldn't the Homebrew installation of Python have just one main site-packages directory under /usr/local/ ???
Edit: I am using virtualenv -- but this is occurring after a fresh install of python using homebrew before I have even had a chance to install virtualenv. Also, I'm interested in why it is happening, not on what I should do to get around it.
Created a stack overflow account just for this, since I was so annoyed by it. I actually had a bug inadvertently caused by that extra "/Library/Python/2.7/site-packages" in the sys.path
Researching it led me to this:
http://bugs.python.org/issue4865
tl;dr: From what I can tell, they throw that path in there to help people that installed packages for the apple-shipped python, but then later would try to use those packages in other versions of python (like the ones used by homebrew, macports, etc).