fixing issue #3178 (#3227)

* Update interface.py

 if the first param is self, trim the param list

* Update CHANGELOG.md

* update and add test

* update and add test

---------

Co-authored-by: Abubakar Abid <abubakar@huggingface.co>
Co-authored-by: Freddy Boulton <alfonsoboulton@gmail.com>

CHANGELOG.md

@@ -30,6 +30,7 @@ No changes to highlight.
 
 ## Bug Fixes:
 - Ensure uploaded images are always shown in the sketch tool by [@pngwn](https://github.com/pngwn) in [PR 3386](https://github.com/gradio-app/gradio/pull/3386)
+- Fixes bug where when if fn is a non-static class member, then self should be ignored as the first param of the fn by [@or25](https://github.com/or25) in [PR #3227](https://github.com/gradio-app/gradio/pull/3227)
 
 ## Documentation Changes:
 No changes to highlight.
@@ -309,8 +310,8 @@ By [@maxaudron](https://github.com/maxaudron) in [PR 3075](https://github.com/gr
 - Fixes bug where interactive output image cannot be set when in edit mode by [@dawoodkhan82](https://github.com/@dawoodkhan82) in [PR 3135](https://github.com/gradio-app/gradio/pull/3135)
 - A share link will automatically be created when running on Sagemaker notebooks so that the front-end is properly displayed by [@abidlabs](https://github.com/abidlabs) in [PR 3137](https://github.com/gradio-app/gradio/pull/3137)
 - Fixes a few dropdown component issues; hide checkmark next to options as expected, and keyboard hover is visible by [@dawoodkhan82](https://github.com/dawoodkhan82) in [PR 3145]https://github.com/gradio-app/gradio/pull/3145)
-- Fixed bug where example pagination buttons were not visible in dark mode or displayed under the examples table. By [@freddyaboulton](https://github.com/freddyaboulton) in [PR 3144](https://github.com/gradio-app/gradio/pull/3144)
+- Fixed bug where example pagination buttons were not visible in dark mode or displayed under the examples table. By [@freddyaboulton](https://github.com/freddyaboulton) in [PR 3144](https://github.com/gradio-app/gradio/pull/3144) 
-- Fixed bug where the font color of axis labels and titles for native plots did not respond to dark mode preferences. By [@freddyaboulton](https://github.com/freddyaboulton) in [PR 3146](https://github.com/gradio-app/gradio/pull/3146)
+- Fixed bug where the font color of axis labels and titles for native plots did not respond to dark mode preferences. By [@freddyaboulton](https://github.com/freddyaboulton) in [PR 3146](https://github.com/gradio-app/gradio/pull/3146) 
 
 ## Documentation Changes:
 - Added a guide on the 4 kinds of Gradio Interfaces by [@yvrjsharma](https://github.com/yvrjsharma) and [@abidlabs](https://github.com/abidlabs) in [PR 3003](https://github.com/gradio-app/gradio/pull/3003)

gradio/interface.py

@@ -400,6 +400,8 @@ class Interface(Blocks):
         Interface.instances.add(self)
 
         param_names = inspect.getfullargspec(self.fn)[0]
+        if len(param_names) > 0 and inspect.ismethod(self.fn):
+            param_names = param_names[1:]
         for component, param_name in zip(self.input_components, param_names):
             assert isinstance(component, IOComponent)
             if component.label is None:

test/test_interfaces.py

@@ -13,6 +13,7 @@ from fastapi.testclient import TestClient
 
 import gradio
 from gradio.blocks import Blocks
+from gradio.components import Image, Textbox
 from gradio.interface import Interface, TabbedInterface, close_all, os
 from gradio.layouts import TabItem, Tabs
 from gradio.utils import assert_configs_are_equivalent_besides_ids
@@ -59,6 +60,24 @@ class TestInterface:
         demo = Interface(fn=greet_upper_case, inputs="text", outputs="text")
         assert demo("abubakar") == "Hello Abubakar!"
 
+    def test_input_labels_extracted_from_method(self):
+        class A:
+            def test(self, parameter_name):
+                return parameter_name
+
+        t = Textbox()
+        Interface(A().test, t, "text")
+        assert t.label == "parameter_name"
+
+        def test(parameter_name1, parameter_name2):
+            return parameter_name1
+
+        t = Textbox()
+        i = Image()
+        Interface(test, [t, i], "text")
+        assert t.label == "parameter_name1"
+        assert i.label == "parameter_name2"
+
     def test_examples_valid_path(self):
         path = os.path.join(
             os.path.dirname(__file__), "../gradio/test_data/flagged_with_log"