Develop Reference

How do my python files get access to installed libraries (Pip)

Sorry in advance if this question has been asked before,
So after some time, I wanted to start a new python project. My previous computer (on which my python files were) died. I had saved my projects in my Dropbox. Now I installed python (3.8, there is also an anaconda installation, but it should not interfere with the python installation) on my new PC, and I cannot import any library to those files.
The python shell can find the imported packages (imported using pip), but even when I move the files to C:\Users\Username\AppData\Local\Programs\Python\Python38-32\Scripts (single user installation). It doesn't work.
I have tried uninstalling and re-installing pygame (in this example. Any library is unusable) using pip, pip3 and even pip3.8, I have added the .whl file by hand, it all didn't work. I have tried a virtual environment, but I can't get that to work either.
I run Windows 10 on a 64-bit computer.

first be sure you know which python installation you use with which import files etc.
you can copy your files not in scripts, but in lib somewhere in site-packages dir.
add your scripts to the python path! sys.path.add(.....) Otherwise python is blind and can't see them

install legacy versions of python from source on windows 10

I would like to install older versions of python for use with virtual environments, ideally from source as these versions are readily available on the official python website python 3.6 here however I can't seem to find any decent instructions.
The link above has version 3.6 full link to the tar.gz here. It downloads, I move into to program files and unzip it with 7zip:
C:\Program Files\7-Zip\7z.exe e Python-3.6.9.tgz
Then unpack the tar file:
tar -xvzf Python-3.6.9
There is no python.exe file in the unpacked directory to add to my path?
Am I missing a build step perhaps?
I found some more instructions here - where there really should be good instructions!, git is installed and setup, as is vs-code. I ran :
PCBuild\build.bat
The file 'PCBuild\pcbuild.sln' appears to have been successfully produced. Now what? I run the test described here
rt.bat -q
And I get: The system cannot find the path specified
For some reason when I run build.bat, a lot of what is printed to the seems to be mentioning python 3.8 which is now the default install on my system, its as if this method is not even pointing to the right version of python.
Please note I am looking specifically for native python approaches to this - NOT conda approaches as it is incompatible with a number of things I am doing.
I've tried; another SO queation, another SO question, here, and here, also here.
Many install guides seem to show only how to install the latest version of python using the python installer, which doesn't seem to be able to be used for legacy versions of python.
Also pythons official site has a link at the bottom labelled ' tools for unpacking archive files' which one would presume would help you to unpack, possibly even install archive files, however the link just takes you back to the top of the page?
Any help would be much appreciated?

Python 2.7.5 on Cygwin64: requests installation fails

Our project is a mostly J2EE based development with the automatic functional and integration tests written in Python. The test environment is Linux nonetheless developers use Windows 7 (64-bit). We would like to be able to execute the functional tests on the developer machines as well (before comitting). Unfortunately the pexpect-windows-portability issue would leave us no choice but:
To do some serious refactoring on our test libraries to be able to use both winpexpect (or wexpect) and pexpect depending on the os settings.
Or to use cygwin. Guess what, with this second option we seem to have an issue :-) Using Python 2.7.5 on Cygwin64 installing the requests package results in error:
pip says it can not find a file after downloading and extracting the library
easy install doesn't throw an explicit error, but leaves everything in the temporary dir
after copying the files under the site-packages directory a simple import requests in python causes the interpreter to exit
Has anybody encountered this problem? With Cygwin-32 requests install smoothly. (however we have some other issues - see my next post ;-))
Thank you in advance: Joe, the public

Also ran into the same issues when trying to install requests, all the options on http://docs.python-requests.org/en/latest/user/install/#install did not work. I went to https://github.com/kennethreitz/requests and then clicked on "Download Zip" and I got requests-master.zip.

Update: This should be fixed in Cygwin.
This was a bug in CPython that has been fixed in their master branch. I've pushed a candidate package to the Python maintainer for Cygwin, but you might try this hotfix.

I downloaded from "https://github.com/requests/requests" and then i just ran the setup.py from the requests-master folder ( this was placed in cygwin folder). After that I went to cygwin terminal and then I ran python --> import requests. Voila it worked.

py2app built app displays `ERROR: pygame.macosx import FAILED` on other machines

Trying to build an app on the Mac using py2app. Got everything working fine on my machine, but when moving the app to another, it crashes and the console displays this error.
ERROR: pygame.macosx import FAILED
Anybody have a solution to this?

Found the problem and solution after many hours. Turns out other people have experienced similar problems and their articles were quite helpful:
http://b.atcg.us/blog/2010/04/13/py2app-hell-the-first.html
http://www.vijayp.ca/blog/?p=62
In case someone else runs into the issue, this particular problem was caused because the Python framework was not being bundled into the application. You can confirm this by right-clicking your app to view package contents, then proceed to Contents/Frameworks/. If Python.framework is not there, it should be.
Be sure to download Python -
My first issue was reliance on Apple's build in Python package. Don't use this. You need to install your own version of python. Go to http://www.python.org/download/releases/, find a version (I stuck with 2.6), download the gzip (not the mac package), and install with the following if you are running Snow Leopard:
./configure --enable-framework MACOSX_DEPLOYMENT_TARGET=10.6 --with-universal-archs=intel --enable-universalsdk=/
make
sudo make install
Adjust Paths, Install Packages - From here there you need to adjust your paths to ensure you are using your custom-installed version. From here, I reinstalled the following packages - this turned out to be a dependency nightmare so I'm including the version numbers as well:
py2app 0.5.2
macholib 1.3
modulegraph .8.0
If these packages actually worked, you should be able to build and run your app now. Unfortunately, they don't. I'll go into the errors and my hacked solutions in a bit, but there's some settings in the build file that need to be made first.
First the setup.py file should like a little somethin' like this:
setup.py
from setuptools import setup
APP = ['Game.py']
DATA_FILES = ['data']
OPTIONS = {
"argv_emulation": False,
"compressed" : True,
"optimize":2,
"iconfile":'data/game.icns',
}
setup(
app=APP,
data_files=DATA_FILES,
options={'py2app': OPTIONS},
)
then to be extra safe, I use a shell script to call this.
build.sh
## Remove previous builds. Start with clean slate.
rm -rf build dist
## Force python into 32 bit mode.
export VERSIONER_PYTHON_PREFER_32_BIT=yes
## Force build with custom installed python
/Library/Frameworks/Python.framework/Versions/2.6/bin/python setup.py py2app
Running build.sh should compile the app. If it does not compile, I have good news -- it's not your fault. Due to glitches in the libraries, you may run into some (or all) of the following:
Potential Problems
If the build script fails, scan the traceback for some of the following keywords:
pygame not found - basic path problem in py2app. Add...
sys.path.insert(0, os.path.join(os.getcwd(), 'lib', 'python2.6','lib-dynload')) ## Added to fix dynlib bug
after the import statements in boot_app.py in the py2app lib.
pythonNone - This appears to be a bug in the macho package where it cannot determine the version number of your python build. To solve this, I added the following lines to build_app.py in py2app.
## Add these two lines...
if not info["version"]:
info["version"] = "2.6"
## Before this line. (line 941 in method copy_python_framework() at time of writing)
pydir = 'python%s'%(info['version'])
No such file or directory...Python.framework/[lib|include] - py2app is simply looking for directories that exist deeper in the file system tree. Go to the Python.framework directory and symlink up the place...
cd /Library/Frameworks/Python.framework
sudo ln -s Versions/Current/include/ include
sudo ln -s Versions/Current/lib lib
That should do it! - These steps created a compiled app that worked on other intel machines.

Thank you for posting what you found!
I had a similar problem. I tried various combinations of what you suggested, and isolated the single issue for me to be the bug in boot_app.py which you identify above.
Once I added the one-line fix to boot_app.py which you identify above, everything worked, even using the pre-installed Apple build of python (version 2.6.1).
I should note that when I say "everything worked," I really mean building a py2app app for actual distribution, i.e. using the normal command:
python setup.py py2app
The "alias" mode. i.e.
python setup.py py2app -A
which the py2app documentation suggests for use during development, still does not work for me (with the same module not found error). But better the actual distribution build working than nothing at all! Again, thanks.

Easy Install for Python and Eclipse Library Paths

Recently I found about this tool easy_install that help me to easy install additional python modules. The problem is that for each module it creates additional *.egg folder (sometime there is only an egg file?) (no source?) and I don't know how to setup eclipse paths.
By default I have included C:\Python26\Lib\site-packages and this is enough when I install python modules from source... but not when I'm using easy_intall
For example django instaled with easy_install is located in C:\Python26\Lib\site-packages\django-1.2.5-py2.6.egg\django and installed from source it's located in C:\Python26\Lib\site-packages\django
In fact when I'm using easy_install all installed modules are working without a problem, the only problem is that eclipse can't locate where is the source and gives me a false unresolved import errors
Where I'm wrong?

I'm assuming that eclipse does not search the egg files for source. Eggs, like jar files in Java, are just zipfiles of python code with some included metadata.
You'll also note that in site-packages you've got easy-install.pth and setuptools.pth files. Those files are parsed by python and used to add other directories and egg files to your PYTHONPATH (import sys; sys.path) so that Python can find the code in those locations. Eclipse isn't seeing those imports as valid because it is most likely not setup to take pth files into account.
To get Eclipse to recognize that Django is really installed you may want to try removing your easy_installed django package and reinstalling it with:
easy_install --always-unzip django
That way rather than installing a compressed egg file you'll have a normal package directory that eclipse should have a fairly easy time opening.
Alternatively, in your screenshot above it looks like you may just need to explicitly add each egg file you want eclipse to use.