Implement get_var_name without getattr

Author: osyuksel

pymc/util.py

@@ -214,7 +214,12 @@ def get_default_varnames(var_iterator, include_transformed):
 
 def get_var_name(var) -> str:
     """Get an appropriate, plain variable name for a variable."""
-    return str(getattr(var, "name", var))
+    if isinstance(var, str):
+        return var
+    elif var.name is not None:
+        return str(var.name)
+    else:
+        return str(var)
 
 
 def get_transformed(z):