Detect getattr mutating method calls

tools/generate_popular_node_signatures.py

@@ -150,6 +150,23 @@ def _getattr_signature_target_names(node):
     return {name}
 
 
+def _getattr_mutating_method_target_names(node):
+    if not isinstance(node, ast.Call):
+        return set()
+    if not isinstance(node.func, ast.Call):
+        return set()
+    getattr_call = node.func
+    if not isinstance(getattr_call.func, ast.Name) or getattr_call.func.id != "getattr":
+        return set()
+    if len(getattr_call.args) < 2:
+        return set()
+    method = getattr_call.args[1]
+    if isinstance(method, ast.Constant) and isinstance(method.value, str):
+        if method.value not in _MUTATING_METHODS:
+            return set()
+    return _target_names(getattr_call.args[0])
+
+
 def _attribute_target_base_names(target):
     if isinstance(target, ast.Attribute):
         name = _root_name(target.value)
@@ -241,6 +258,7 @@ def _class_attribute_mutation_target_names(stmt):
 
         def visit_Call(self, node):
             names.update(_setattr_delattr_target_names(node))
+            names.update(_getattr_mutating_method_target_names(node))
             if isinstance(node.func, ast.Attribute) and node.func.attr in _MUTATING_METHODS:
                 names.update(_attribute_target_base_names(node.func.value))
             self.generic_visit(node)
@@ -409,6 +427,7 @@ def _mutating_call_target_names(stmt):
 
         def visit_Call(self, node):
             names.update(_setattr_delattr_target_names(node))
+            names.update(_getattr_mutating_method_target_names(node))
             if isinstance(node.func, ast.Attribute) and node.func.attr in _MUTATING_METHODS:
                 names.update(_target_names(node.func.value))
             self.generic_visit(node)