feat: skip __init__ when calling classmethods and staticmethods

fire/core.py

@@ -456,6 +456,11 @@ def _Fire(component, args, parsed_flag_args, context, name=None):
 
     is_callable = inspect.isclass(component) or inspect.isroutine(component)
     is_callable_object = callable(component) and not is_callable
+    if (inspect.isclass(component)
+        and _IsClassOrStaticMethodAccess(component, remaining_args)):
+      # Classmethods and staticmethods don't need an instance, so skip __init__
+      # and let the object handler below access the method on the class.
+      is_callable = False
     is_sequence = isinstance(component, (list, tuple))
     is_map = isinstance(component, dict) or inspectutils.IsNamedTuple(component)
 
@@ -619,6 +624,19 @@ def _Fire(component, args, parsed_flag_args, context, name=None):
   return component_trace
 
 
+def _IsClassOrStaticMethodAccess(cls, args):
+  """Returns whether the next arg names a classmethod or staticmethod of cls."""
+  if not args:
+    return False
+  for name in (args[0], args[0].replace('-', '_')):
+    try:
+      attr = inspect.getattr_static(cls, name)
+    except AttributeError:
+      continue
+    return isinstance(attr, (classmethod, staticmethod))
+  return False
+
+
 def _GetMember(component, args):
   """Returns a subcomponent of component by consuming an arg from args.
 

fire/core_test.py

@@ -189,6 +189,12 @@ def testClassMethod(self):
         7,
     )
 
+  def testStaticAndClassMethodsSkipConstructor(self):
+    component = tc.ErrorInConstructorWithStaticAndClassMethods
+    self.assertEqual(core.Fire(component, command=['static_fn', 'alpha']),
+                     'alpha')
+    self.assertEqual(core.Fire(component, command=['class-fn', '6']), 7)
+
   def testCustomSerialize(self):
     def serialize(x):
       if isinstance(x, list):

fire/test_components.py

@@ -64,6 +64,20 @@ def __init__(self, value='value'):
     raise ValueError('Error in constructor')
 
 
+class ErrorInConstructorWithStaticAndClassMethods:
+
+  def __init__(self):
+    raise ValueError('Error in constructor')
+
+  @staticmethod
+  def static_fn(args):
+    return args
+
+  @classmethod
+  def class_fn(cls, args):
+    return args + 1
+
+
 class WithHelpArg:
   """Test class for testing when class has a help= arg."""