Test for try_import with reload(sys) (PY-14649, PY-14779)

python/testData/debug/test_try_import.py

@@ -0,0 +1,31 @@
+import sys
+try:
+    # Python2
+    reload(sys)
+except:
+    # Python3
+    import importlib
+    importlib.reload(sys)
+
+def try_import(module_name):
+    """
+    Import and return *module_name*.
+
+    Unlike the standard try/except approach to optional imports, inspect
+    the stack to avoid catching ImportErrors raised from **within** the
+    module. Only return None if *module_name* itself cannot be imported.
+
+    It is used in rapidsms, django-oscar and may be somewhere else.
+    """
+    try:
+        __import__(module_name)
+        return sys.modules[module_name]
+    except ImportError:
+        type, info, traceback = sys.exc_info()
+        if traceback.tb_next:
+            raise
+        return None
+
+result = try_import("datetime")
+result = try_import("nonexistent_module")
+result = None