code: def test_replace_unicode_with_number(self):
      # GH 15743
      s = pd.Series([1, 2, 3])
      result = s.replace("2", np.nan)
      expected = pd.Series([1, 2, 3])
      tm.assert_series_equal(expected, result)
  
imports: import re
  import numpy
  import pytest
  from pandas._config import using_pyarrow_string_dtype
  import pandas
  import pandas._testing
  from pandas.core.arrays import IntervalArray
label_desc: Use image node_id 23 for calling the TestSeriesReplace obj's underlying member method code with example usage: obj.test_replace_unicode_with_number() without return types