code: def test_accept_valid_formats(self):
      # note: We decided to accept %u even though it is slightly problematic.
      #       See https://github.com/streamlit/streamlit/pull/943
      SUPPORTED = "adifFeEgGuXxo"
      for char in SUPPORTED:
          st.number_input("any label", format="%" + char)
          c = self.get_delta_from_queue().new_element.number_input
          self.assertEqual(c.format, "%" + char)
  
imports: from unittest.mock import MagicMock, patch
  import pytest
  from parameterized import parameterized
  import streamlit
  from streamlit.errors import StreamlitAPIException
  from streamlit.js_number import JSNumber
  from streamlit.proto.Alert_pb2 import Alert
  from streamlit.proto.LabelVisibilityMessage_pb2 import LabelVisibilityMessage
  from streamlit.proto.NumberInput_pb2 import NumberInput
  from streamlit.proto.WidgetStates_pb2 import WidgetState
  from streamlit.testing.v1.app_test import AppTest
  from tests.delta_generator_test_case import DeltaGeneratorTestCase
label_desc: Use image node_id 16 for calling the NumberInputTest obj's underlying member method code with example usage: obj.test_accept_valid_formats() without return types