assert_python_ok docstring typo fix.
diff --git a/Lib/test/script_helper.py b/Lib/test/script_helper.py
index b29392f..d27496b 100644
--- a/Lib/test/script_helper.py
+++ b/Lib/test/script_helper.py
@@ -107,7 +107,7 @@
variables `env_vars` succeeds (rc == 0) and return a (return code, stdout,
stderr) tuple.
- If the __cleanenv keyword is set, env_vars is used a fresh environment.
+ If the __cleanenv keyword is set, env_vars is used as a fresh environment.
Python is started in isolated mode (command line option -I),
except if the __isolated keyword is set to False.