Fix get_caller_name

dash/_utils.py

@@ -284,10 +284,12 @@ def parse_version(version):
     return tuple(int(s) for s in version.split("."))
 
 
-def get_caller_name(name: str):
-    stack = inspect.stack()
-    for s in stack:
-        for code in s.code_context:
-            if f"{name}(" in code:
-                return s.frame.f_locals.get("__name__", "__main__")
-    return "__main__"
+def get_caller_name():
+    try:
+        stack = inspect.stack()
+        # takes the stack before the `__init__`
+        # 0 is current, __init__ is 1 then next one is the `app = Dash()` call
+        s = stack[2]
+        return s.frame.f_locals.get("__name__", "__main__")
+    finally:
+        return "__main__"  # pylint: disable=lost-exception

dash/dash.py

@@ -396,7 +396,7 @@ def __init__(  # pylint: disable=too-many-statements
     ):
         _validate.check_obsolete(obsolete)
 
-        caller_name = get_caller_name(self.__class__.__name__)
+        caller_name = get_caller_name()
 
         # We have 3 cases: server is either True (we create the server), False
         # (defer server creation) or a Flask app instance (we use their server)