extras/check_dependencies

[Alexander Gorodetski]

something is wrong with this script... I get following message

extras/check_dependencies.sh: we recommend that you run (our best guess):

 sudo apt-get install  python2.7

even though python2.7 is installed on my computer....

[Alexander Gorodetski]

I beleive that following line

add_packages python2.7 python2.7 python2.7

should be replaced to 

add_packages python python python

If one install python2.7 (for example apt-get install python2.7) then when you run command "which python" you do not see it installed... Only "which python2.7" works in this case....

[Daniel Povey]

Hm.

Looks like you're right...
Per the following:
https://wiki.ubuntu.com/Python/3
it looks like there is no plan for /usr/bin/python to point to python3.

Yenda, perhaps you could make the suggested change?
I have verified this for Debian only-- not sure on red hat, whether
this would be the right thing.


Dan

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[Jan Trmal]

yes, I will look into it.

y.

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[Jan Trmal]

guys, apologies for reviving this, but from the ubuntu page it is not clear to me that the package "python" will always install python2.7

It merely says that the system command "python" will always point to python 2.7 (assuming it exists). 

Also, given the fact that python is just a dependency-package and installs the latest version, which "depends on Debian's default Python version (currently v2.7)." (see https://packages.debian.org/stable/python/python)

it seems to me from the wording that python package could/will in the future point to python3

Also, as I don't have an easy access to debian/ubuntu machine with root, are we sure that python2.7 package does not install the python symlink and it's what "python" does? I downloaded and unpacked the deb and it _might_ be changing the link (using update-alternatives) but I wonder if that just fixed some inconsistent state Alexander's system was in?

Anyway -- I'm ready to push the suggested fix, but I'm not that convinced it will be doing what it's supposed to do.

y.

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[anand]

Unless the symlink (python) was manually deleted, the error "python2.7 is not installed" shouldn't show up if python2.7 was installed.  The script checks for the existence of 'python' in the PATH before checking for the version. AFAIK the symlink python should point to the default version of python (either 2.7 or 3.x)

http://legacy.python.org/dev/peps/pep-0394/

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[Daniel Povey]

Yenda, I found a page (I may have sent the link) which confirmed that
the Debian and Ubuntu projects plan, for the forseeable future, to
make 'python' continue to point to python2.7, and python3 will be
explicitly called as python3.
So I think you can assume python -> python2.7. They can't of course
guarantee this for all time.

Dan