Get Python version with GNU Make

get_python_version.mk

# Replace '.' with '' to get $PYTHON_VERSION_INT directly
# e.g. 3.7
PYTHON_VERSION = $(shell python -c "import sys;print('.'.join(map(str,sys.version_info[:2])))")
# e.g. 37
PYTHON_VERSION_INT = $(subst .,,$(PYTHON_VERSION))
# e.g. 3
PYTHON_MAJOR_VERSION = $(basename $(PYTHON_VERSION))
# e.g. 7
PYTHON_MINOR_VERSION = $(subst .,,$(suffix $(PYTHON_VERSION)))
all:
	@echo Python version: $(PYTHON_VERSION)
	@echo Python major version: $(PYTHON_MAJOR_VERSION)
	@echo Python minor version: $(PYTHON_MINOR_VERSION)
	@echo Python version integer: $(PYTHON_VERSION_INT)