Python version test now correct

Makefile

@@ -1,3 +1,4 @@
+SHELL := bash -o pipefail
 
 TODAY := $(shell date '+%Y-%m-%d')
 
@@ -7,7 +8,10 @@ AWS_PROFILE := default
 
 PYTEST_OPTS := ''
 
+# Prepare for python version checks
 PYTHON_MIN_VERSION := 3.8
+PYTHON_CUR_VERSION := $(shell python3 -V 2>/dev/null)
+PYTHON_GOOD := $(shell echo $(PYTHON_CUR_VERSION) | grep --silent $(PYTHON_MIN_VERSION) && echo true || echo false )
 PYTHON_VER_WARNING = $(warning Warning! Frost supports Python $(PYTHON_MIN_VERSION), \
 		      you're running $(shell python3 -V))
 PYTHON_VER_ERROR = $(error Frost supports Python $(PYTHON_MIN_VERSION), \
@@ -24,8 +28,10 @@ awsci: check_venv
 check_venv:
 ifeq ($(VIRTUAL_ENV),)
 	$(error "Run frost from a virtualenv (try 'make install && source venv/bin/activate')")
+else ifneq ($(PYTHON_GOOD),true)
+	$(PYTHON_VER_WARNING)
 else
-	python3 -V | grep $(PYTHON_MIN_VERSION) || true ; $(PYTHON_VER_WARNING)
+	@echo "Using $(PYTHON_CUR_VERSION)"
 endif
 
 check_conftest_imports: