Example of refactoring using rope library.

tools/telemetry/third_party/rope/rope/base/exceptions.py

Index: tools/telemetry/third_party/rope/rope/base/exceptions.py
diff --git a/tools/telemetry/third_party/rope/rope/base/exceptions.py b/tools/telemetry/third_party/rope/rope/base/exceptions.py
new file mode 100644
index 0000000000000000000000000000000000000000..d161c89ed688cd463434c6882566f12299853cf4
--- /dev/null
+++ b/tools/telemetry/third_party/rope/rope/base/exceptions.py
@@ -0,0 +1,61 @@
+class RopeError(Exception):
+    """Base exception for rope"""
+
+
+class ResourceNotFoundError(RopeError):
+    """Resource not found exception"""
+
+
+class RefactoringError(RopeError):
+    """Errors for performing a refactoring"""
+
+
+class InterruptedTaskError(RopeError):
+    """The task has been interrupted"""
+
+
+class HistoryError(RopeError):
+    """Errors for history undo/redo operations"""
+
+
+class ModuleNotFoundError(RopeError):
+    """Module not found exception"""
+
+
+class AttributeNotFoundError(RopeError):
+    """Attribute not found exception"""
+
+
+class NameNotFoundError(RopeError):
+    """Name not found exception"""
+
+
+class BadIdentifierError(RopeError):
+    """The name cannot be resolved"""
+
+
+class ModuleSyntaxError(RopeError):
+    """Module has syntax errors
+
+    The `filename` and `lineno` fields indicate where the error has
+    occurred.
+
+    """
+
+    def __init__(self, filename, lineno, message):
+        self.filename = filename
+        self.lineno = lineno
+        self.message_ = message
+        super(ModuleSyntaxError, self).__init__(
+            'Syntax error in file <%s> line <%s>: %s' %
+            (filename, lineno, message))
+
+
+class ModuleDecodeError(RopeError):
+    """Cannot decode module"""
+
+    def __init__(self, filename, message):
+        self.filename = filename
+        self.message_ = message
+        super(ModuleDecodeError, self).__init__(
+            'Cannot decode file <%s>: %s' % (filename, message))