Switch default python to 3.10

repo2docker/buildpacks/conda/__init__.py

@@ -143,7 +143,7 @@ def get_build_scripts(self):
             ),
         ]
 
-    major_pythons = {"2": "2.7", "3": "3.7"}
+    major_pythons = {"2": "2.7", "3": "3.10"}
 
     def get_build_script_files(self):
         """

repo2docker/buildpacks/conda/environment.yml

@@ -1,7 +1,7 @@
 channels:
   - conda-forge
 dependencies:
-  - python=3.7
+  - python=3.10
   - nodejs=18
   - pip
   - ipywidgets==8.0.2

repo2docker/buildpacks/conda/freeze.py

@@ -126,7 +126,7 @@ def set_python(py_env_file, py):
         default=("linux-64", "linux-aarch64"),
     )
     args = parser.parse_args()
-    default_py = "3.7"
+    default_py = "3.10"
     for py in args.py:
         for platform in args.platform:
             env_file = pathlib.Path(str(ENV_FILE_T).format(py=py))

tests/conda/downgrade/environment.yml

@@ -0,0 +1,11 @@
+# originally xeus-cling@0.6.0
+# added python=3.9 pin because implicit downgrade of Python from 3.10 to 3.9 isn't allowed
+name: xeus-cling
+channels:
+  - conda-forge
+dependencies:
+  - python=3.9
+  - xeus-cling=0.6.0
+  - xtensor=0.20.8
+  - xtensor-blas=0.16.1
+  - notebook

tests/conda/downgrade/verify

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+import json
+import pprint
+from subprocess import check_output
+
+
+def json_sh(cmd):
+    """Run a command that produces JSON on stdout and return the parsed result"""
+    buf = check_output(cmd)
+    return json.loads(buf.decode("utf8", "replace"))
+
+
+conda_pkg_list = json_sh(["conda", "list", "--json"])
+pprint.pprint(conda_pkg_list)
+# make it a dict
+pkgs = {pkg["name"]: pkg for pkg in conda_pkg_list}
+
+# base env resolved
+assert pkgs["python"]["version"].startswith("3.9"), pkgs["python"]
+assert "xeus-cling" in pkgs
+assert pkgs["xeus-cling"]["version"] == "0.6.0"
+
+# verify downgrade
+# this may be brittle, but it's unlikely any of these old versions
+# of packages will be rebuilt
+# xeus-cling 0.6.0 pins xeus 0.20, which pins openssl 1.1.1,
+# which in turn downgrades Python from >=3.9.16 to 3.9.6
+
+assert pkgs["openssl"]["version"].startswith("1.1.1"), pkgs["openssl"]["version"]
+assert pkgs["python"]["version"] == "3.9.6", pkgs["python"]["version"]

tests/conda/py-r-postbuild-file/verify.py

@@ -4,8 +4,8 @@
 
 
 def test_sys_version():
-    """The default python version should be 3.7"""
-    assert sys.version_info[:2] == (3, 7)
+    """The default python version should be 3.10"""
+    assert sys.version_info[:2] == (3, 10)
 
 
 def test_there():

tests/conda/py2/verify

@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 import sys
 
-assert sys.version_info[:2] == (3, 7), sys.version
+assert sys.version_info[:2] == (3, 10), sys.version
 
 # verify that we have Python 2 and Python 3 kernelspecs
 from jupyter_client.kernelspec import KernelSpecManager

tests/conda/py35-binder-dir/verify

@@ -3,7 +3,7 @@ import os
 import sys
 from subprocess import STDOUT, check_output
 
-assert sys.version_info[:2] == (3, 7), sys.version
+assert sys.version_info[:2] == (3, 10), sys.version
 
 
 def sh(cmd, **kwargs):

tests/conda/py36-postBuild/verify.py

@@ -69,7 +69,7 @@ def test_kernel_env(kernel_conda):
 def test_server_env(server_conda):
     # this should be the default version
     # it will need updating when the default changes
-    assert server_conda["python"]["version"][:3] == "3.7"
+    assert server_conda["python"]["version"].split(".")[:2] == ["3", "10"]
 
 
 def test_conda_install(kernel_conda, server_conda):

tests/external/reproductions.repos.yaml

@@ -10,26 +10,20 @@
   ref: b8259dac9eb
   verify: python -c 'import matplotlib'
 # Test that a full remote/ref works
-- name: Binder Examples - Requirements
+- name: Binder Examples - Requirements - origin/main
   url: https://github.com/binder-examples/requirements
   ref: origin/main
   verify: python -c 'import matplotlib'
 # Test that ref is added to branch if not present
-- name: Binder Examples - Requirements
+- name: Binder Examples - Requirements - main
   url: https://github.com/binder-examples/requirements
   ref: main
   verify: python -c 'import matplotlib'
 # Test that tags work + ref is added to tag if not present
-- name: Binder Examples - Requirements
+- name: Binder Examples - Requirements - tag
   url: https://github.com/binder-examples/requirements
-  ref: python-3.7
+  ref: python-3.8
   verify: python -c 'import matplotlib'
-# Test that custom channels and downgrades don't
-# get blocked by pinning
-- name: Xeus-Cling
-  url: https://github.com/QuantStack/xeus-cling
-  ref: 0.6.0
-  verify: jupyter kernelspec list
 # Zenodo record of https://github.com/binder-examples/requirements
 - name: 10.5281/zenodo.3242074
   url: 10.5281/zenodo.3242074

tests/venv/default/verify

@@ -2,7 +2,7 @@
 # Verify that the default just provides a py3 environment with jupyter
 import sys
 
-assert sys.version_info[:2] == (3, 7), sys.version
+assert sys.version_info[:2] == (3, 10), sys.version
 import jupyter
 
 with open("/tmp/appendix") as f:

tests/venv/numpy/verify

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 import sys
 
-assert sys.version_info[:2] == (3, 7)
+assert sys.version_info[:2] == (3, 10)
 
 import numpy