docs

Author: lucascolley

README.md

@@ -36,6 +36,12 @@ You need to specify the array library to test. It can be specified via the
 $ export ARRAY_API_TESTS_MODULE=array_api_strict
 ```
 
+To specify a runtime-defined module, define `xp` using the `exec('...')` syntax:
+
+```bash
+$ export ARRAY_API_TESTS_MODUle=exec('import pint_array, numpy; xp = pint_array.pint_namespace(numpy)')
+```
+
 Alternately, import/define the `xp` variable in `array_api_tests/__init__.py`.
 
 ### Specifying the API version

array_api_tests/__init__.py

@@ -14,7 +14,7 @@
 # you want to test, e.g. `import array_api_strict as xp`.
 if "ARRAY_API_TESTS_MODULE" in os.environ:
     env_var = os.environ["ARRAY_API_TESTS_MODULE"]
-    if env_var.startswith("exec(") and env_var.endswith(")"):
+    if env_var.startswith("exec('") and env_var.endswith("')"):
         script = env_var[6:][:-2]
         namespace = {}
         exec(script, namespace)