Start on PYTHON_SERIES approach

Author: j-woz

dev/conda/conda-build.sh

@@ -61,8 +61,7 @@ export SWIFT_T_VERSION
 log "SWIFT/T VERSION: $SWIFT_T_VERSION"
 # Setenvs PYTHON_VERSION: passed into meta.yaml: e.g. "3.12.11"
 source $DEV_CONDA/get-python-version.sh
-# Python version, just major.minor: e.g. "3.12"
-export PYTHON_VERSION_MM=${PYTHON_VERSION_MM%.*}
+log "PYTHON_VERSION: $PYTHON_VERSION   SERIES: $PYTHON_SERIES"
 # Optionally set R_VERSION from user argument:
 if (( ${#R} )) export R_VERSION=${R[2]}
 

dev/conda/get-python-version.sh

@@ -6,3 +6,17 @@ T=( $( python --version ) )
 print "get-python-version.sh: Python version detected: $T"
 
 export PYTHON_VERSION=${T[2]}
+
+# ZSH syntax: Split e.g. "3.12.7" into ( 3 12 7 )
+VS=( ${(s:.:)PYTHON_VERSION} )
+
+# Python version, just major.minor: e.g. "3.12"
+export PYTHON_VERSION_MM="${VS[1]}.${VS[2]}"
+
+# Get the next Python version (as an upper bound for meta.yaml)
+NEXT_MINOR=$[ ${VS[2]} + 1 ]
+export PYTHON_NEXT_MM="${VS[1]}.${NEXT_MINOR}"
+
+# Current Python series in meta.yaml range format:
+# E.g., >=3.12,<3.13
+export PYTHON_SERIES=">=${PYTHON_VERSION_MM},<${PYTHON_NEXT_MM}"

dev/conda/meta-template.yaml

@@ -30,7 +30,7 @@ m4_ifelse(m4_getenv(ENABLE_R),`1',m4_include(env-R.yaml))
 # Remember to sync any dependency changes here with conda-install.sh
 requirements:
   build:
-    - python==m4_getenv(PYTHON_VERSION)
+    - python m4_getenv(PYTHON_SERIES)
     # Anaconda Autoconf 2.72 is buggy 2025-05-12
     - autoconf==2.71
     # Automake is needed on osx-arm64: 2025-10-27
@@ -46,7 +46,7 @@ m4_ifelse(m4_getenv(USE_TK),   `1',m4_include(pkgs-tk.yaml))m4_dnl
 m4_ifelse(m4_getenv(USE_ZSH),  `1',m4_include(pkgs-zsh.yaml))m4_dnl
 m4_ifelse(m4_getenv(ENABLE_R), `1',m4_include(pkgs-R.yaml))m4_dnl
   run:
-    - python==m4_getenv(PYTHON_VERSION_MM)
+    - python m4_getenv(PYTHON_SERIES)
     - openjdk>=17
     - m4_getenv(SPEC_MPICH)
     - swig