On 6/28/2018 6:45 PM, Elliott Roper wrote:
On 28 Jun 2018, Terry Reedy wrote
There is a pip command for making an editable file of installed
packages. Run that in 3.6, perhaps after updating everything.
There is another pip command for using that file to install everything
listed. Run that in 3.7.
I can't see the pip commands you mention for writing a file from 3.6
and
reading it back for 3.7
Is it pip freeze -r <file> followed by pip install -r<file>? If so, what is
meant by 'the given requirements file' in the freeze options?
'pip freeze' sends the requirements list to stdout in alphabetical
order. You redirect or copy-paste to a file. I have not done this, but
apparently -r <file> uses file as a template for selecting and ordering
the requirements. I presume pip will ignore any versions in the
template and list the actual installed versions.
I believe you got the install right.
When I look inside site-packages in ~/Library (see below) I see many packages
that pip lists, but by no means all. F'instance numpy and scipy. They can be
found in /Library's site-packages however.
My understanding is that the whole $PATH is searched in order to resolve an
import, but it isn't.
The OS searches the OS path, which you listed above.
Python searches its sys.path, which it creates when started.
Run >>> import sys; sys.path to see the contents.
Unless macOS is more different than I think, you should see a 3.7
site-packages when running 3.7.
Aha! That is most helpful
Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 26 2018, 23:26:24)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
(python prompt)>>> import sys
.>>>sys.path
['', '/Library/Frameworks/Python.framework/Versions/3.7/lib/python37.zip', #
no such file
sys.path included directories that might be present. In this case, a
zipped version of the stdlib.
'/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7', # 207
items, none matching pip intstallable modules
'/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/lib-
dynload',# 69 items, none matching pip installable modules
'/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages'] # just pip and setuptools are in here
.>>> ^D
site-packages is the default for 3rd parth packages. It can have .pth
files that extend the directory to effectively include other directories.
EiPro:~ elliott$ python3.6
Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 05:52:31)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
.>>> import sys
(python prompt)>>> sys.path
['', '/Library/Frameworks/Python.framework/Versions/3.6/lib/python36.zip', #
no such file
'/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6', # 207
items, none matching pip intstallable modules
'/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-
dynload',# 65 items, none matching pip installable modules
'/Users/elliott/Library/Python/3.6/lib/python/site-packages', # 103 items
some matching items that appear in pip3.6 list
'/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-
packages'] # numpy, scipy, pandas etc. are here. These might have been
modules I needed sudo -H to update
.>>>
What I did not make clear that my 'elliott' user is not an Administrator. If
I log into my admin account (which I hardly ever do), it thinks my Python3 is
3.7, list there also shows the hugely abbreviated collection of modules
namely pip and setuptools. pip list shows a list of modules so old as to be
unrecognisable.
I expect the system install to be 2.7, python3 link to 3.7 either
because that is the most recent 3x installed or the most recent version.
It looks like I have a tangled mess. Is there a way of getting rid of all the
pythons except Apple's museum piece and starting again? It is a hobby for me.
I have no need for backward compatibility. I think if I could install 3.7
site wide from my non-admin account, I would be happiest. The standard
install pretty much worked up to 3.6
pip
Would it be safe to delete everything on python's sys.path and re-install
from the download .pkg
I suspect you can get rid of 3.6, 3.5, 3.4, but I am not a Mac user. I
hope someone who is answers.
--
Terry Jan Reedy
--
https://mail.python.org/mailman/listinfo/python-list
