Comments (6)
isuruf
commented on July 18, 2024
1
I would argue that then mamba is not doing what it is supposed to be doing.
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wolfv
commented on July 18, 2024
Mamba gives you an appropriate solution:
Looking for: ['python=3.8', 'pymysql=0.10']
Transaction
Prefix: /home/wolfv/miniconda3/envs/asdn123
Updating specs:
- python==3.8
- pymysql==0.10
Package Version Build Channel Size
───────────────────────────────────────────────────────────────────────────────
Install:
───────────────────────────────────────────────────────────────────────────────
_libgcc_mutex 0.1 main pkgs/main/linux-64 Cached
ca-certificates 2020.6.24 0 pkgs/main/linux-64 Cached
certifi 2020.6.20 py38_0 pkgs/main/linux-64 156 KB
ld_impl_linux-64 2.33.1 h53a641e_7 pkgs/main/linux-64 568 KB
libedit 3.1.20191231 h14c3975_1 pkgs/main/linux-64 116 KB
libffi 3.3 he6710b0_2 pkgs/main/linux-64 50 KB
libgcc-ng 9.1.0 hdf63c60_0 pkgs/main/linux-64 Cached
libstdcxx-ng 9.1.0 hdf63c60_0 pkgs/main/linux-64 Cached
ncurses 6.2 he6710b0_1 pkgs/main/linux-64 Cached
openssl 1.1.1g h7b6447c_0 pkgs/main/linux-64 3 MB
pip 20.1.1 py38_1 pkgs/main/linux-64 2 MB
pymysql 0.10.0 pyh9f0ad1d_0 conda-forge/noarch 42 KB
python 3.8.3 hcff3b4d_2 pkgs/main/linux-64 49 MB
readline 8.0 h7b6447c_0 pkgs/main/linux-64 Cached
setuptools 49.2.0 py38_0 pkgs/main/linux-64 737 KB
sqlite 3.32.3 h62c20be_0 pkgs/main/linux-64 1 MB
tk 8.6.10 hbc83047_0 pkgs/main/linux-64 3 MB
wheel 0.34.2 py38_0 pkgs/main/linux-64 51 KB
xz 5.2.5 h7b6447c_0 pkgs/main/linux-64 341 KB
zlib 1.2.11 h7b6447c_3 pkgs/main/linux-64 Cached
Summary:
Install: 20 packages
Total download: 59 MB
───────────────────────────────────────────────────────────────────────────────
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synapticarbors
commented on July 18, 2024
Actually I tried this earlier with mamba and it worked. I'm starting to experiment with mamba more and more, but still need to use regular conda in several important settings.
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jjhelmus
commented on July 18, 2024
The correct answer with --strict-channel-priority and defaults as the highest priority channel is unsat.
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jjhelmus
commented on July 18, 2024
With flexible channel priority (the default option) conda gives the following solution which is likely desired.:
~$ conda create -n test python=3.8.* pymysql=0.10.* --override-channels -c defaults -c conda-forge
Collecting package metadata (current_repodata.json): done
Solving environment: done
## Package Plan ##
environment location: /home/jhelmus/conda/envs/test
added / updated specs:
- pymysql=0.10
- python=3.8
The following packages will be downloaded:
package | build
---------------------------|-----------------
pymysql-0.10.0 | pyh9f0ad1d_0 42 KB conda-forge
------------------------------------------------------------
Total: 42 KB
The following NEW packages will be INSTALLED:
_libgcc_mutex pkgs/main/linux-64::_libgcc_mutex-0.1-main
ca-certificates pkgs/main/linux-64::ca-certificates-2020.6.24-0
ld_impl_linux-64 pkgs/main/linux-64::ld_impl_linux-64-2.33.1-h53a641e_7
libedit pkgs/main/linux-64::libedit-3.1.20191231-h14c3975_1
libffi pkgs/main/linux-64::libffi-3.3-he6710b0_2
libgcc-ng pkgs/main/linux-64::libgcc-ng-9.1.0-hdf63c60_0
libstdcxx-ng pkgs/main/linux-64::libstdcxx-ng-9.1.0-hdf63c60_0
ncurses pkgs/main/linux-64::ncurses-6.2-he6710b0_1
openssl pkgs/main/linux-64::openssl-1.1.1g-h7b6447c_0
pymysql conda-forge/noarch::pymysql-0.10.0-pyh9f0ad1d_0
python pkgs/main/linux-64::python-3.8.3-hcff3b4d_2
readline pkgs/main/linux-64::readline-8.0-h7b6447c_0
sqlite pkgs/main/linux-64::sqlite-3.32.3-h62c20be_0
tk pkgs/main/linux-64::tk-8.6.10-hbc83047_0
xz pkgs/main/linux-64::xz-5.2.5-h7b6447c_0
zlib pkgs/main/linux-64::zlib-1.2.11-h7b6447c_3
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synapticarbors
commented on July 18, 2024
As I mentioned over on gitter, I think I just misunderstood what --strict-channel-priorty or channel_priority: strict in the .condarc was actually doing. According to @jjhelmus, if pymysql exists in defaults (and it does), it forces conda to ignore the version on conda-forge. I had thought, since I was specifying a version that only existed on conda-forge that it would pull python 3.8 from defaults and then be able to pick up pymysql from conda-forge. This is clear from the documentation, which I obviously didn't fully digest:
With strict channel priority, packages in lower
priority channels are not considered if a package with the same name
appears in a higher priority channel.
Making the channel priority flexible solves the issue.
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