bpo-40669: Install PEG benchmarking dependencies in a venv (GH-20183)

Create a `make venv` target, that creates a virtual environment
and installs the dependency in that venv. `make time` and all
the related targets are changed to use the virtual environment
python.

Automerge-Triggered-By: @pablogsal

1 files changed, 7 insertions, 2 deletions

diff --git a/Tools/peg_generator/scripts/benchmark.py b/Tools/peg_generator/scripts/benchmark.py
index d39ac3d..4942b99 100644
--- a/Tools/peg_generator/scripts/benchmark.py
+++ b/Tools/peg_generator/scripts/benchmark.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3.9
+#!/usr/bin/env python3
 
 import argparse
 import ast
@@ -6,7 +6,12 @@ import sys
 import os
 from time import time
 
-import memory_profiler
+try:
+    import memory_profiler
+except ModuleNotFoundError:
+    print("Please run `make venv` to create a virtual environment and install"
+          " all the dependencies, before running this script.")
+    sys.exit(1)
 
 sys.path.insert(0, os.getcwd())
 from peg_extension import parse