Merge pull request #2378 from locustio/deprecate-LOCUST_PLAYWRIGHT-en…

…v-var

Deprecate LOCUST_PLAYWRIGHT env var

locust/__init__.py

@@ -1,10 +1,14 @@
 import os
 
-if os.getenv("LOCUST_PLAYWRIGHT", False):
-    # This is a hack to make Playwright testing possible. If trio is not imported before gevent's monkey patching,
-    # it raises "NotImplementedError: unsupported platform"
-    # Playwright is used by PlaywrightUser, see https://github.com/SvenskaSpel/locust-plugins/blob/master/examples/playwright_ex.py
-    import trio
+if os.getenv("LOCUST_PLAYWRIGHT", None):
+    print("LOCUST_PLAYWRIGHT setting is no longer needed (because locust-plugins no longer installs trio)")
+    print("Uninstall trio package and remove the setting.")
+    try:
+        # preserve backwards compatibility for now
+        import trio
+    except ModuleNotFoundError:
+        # dont show a massive callstack if trio is not installed
+        os._exit(1)
 
 from gevent import monkey