Use Python 3

Use `python3` and `pip3` explicitly, as we now depend on Python 3.

Author: ellismg

build/common.mk

@@ -101,6 +101,11 @@ ifeq ($(PULUMI_ROOT),)
 	PULUMI_ROOT:=/opt/pulumi
 endif
 
+# Use Python 3 explicitly vs expecting that `python` will resolve to a python 3
+# runtime.
+PYTHON ?= python3
+PIP ?= pip3
+
 PULUMI_BIN          := $(PULUMI_ROOT)/bin
 PULUMI_NODE_MODULES := $(PULUMI_ROOT)/node_modules
 

sdk/python/Makefile

@@ -2,14 +2,6 @@ PROJECT_NAME     := Pulumi Python SDK
 LANGHOST_PKG     := github.com/pulumi/pulumi/sdk/python/cmd/pulumi-language-python
 VERSION          := $(shell ../../scripts/get-py-version)
 
-ifeq ($(PYTHON),)
-	PYTHON := python
-endif
-
-ifeq ($(PIP),)
-	PIP := pip
-endif
-
 PYENV := ./env
 PYENVSRC := $(PYENV)/src