code: def test_selection_methods_of_assigned_col():
      # GH 29282
      df = DataFrame(data={"a": [1, 2, 3], "b": [4, 5, 6]})
      df2 = DataFrame(data={"c": [7, 8, 9]}, index=[2, 1, 0])
      df["c"] = df2["c"]
      df.at[1, "c"] = 11
      result = df
      expected = DataFrame(
          {"a": [1, 2, 3], "b": [4, 5, 6], "c": [9, 11, 7]}
      )
      tm.assert_frame_equal(result, expected)
      result = df.at[1, "c"]
      assert result == 11
  
      result = df["c"]
      expected = Series([9, 11, 7], name="c")
      tm.assert_series_equal(result, expected)
  
      result = df[["c"]]
      expected = DataFrame({"c": [9, 11, 7]})
      tm.assert_frame_equal(result, expected)
  
imports: from datetime import datetime, timezone
  import numpy
  import pytest
  from pandas.errors import InvalidIndexError
  from pandas import CategoricalDtype, CategoricalIndex, DataFrame, DatetimeIndex, Index, MultiIndex, Series, Timestamp
  import pandas._testing
label_desc: Use image node_id 2 for calling a global function with example usage: test_selection_methods_of_assigned_col() without return types