code: def binary_series_with_nan():
      return pd.Series([np.NaN, 1, 1])
  
imports: import numpy
  import pandas
  import pytest
  from tests.fixtures import warning_free
  from tsfresh.defaults import TEST_FOR_BINARY_TARGET_REAL_FEATURE
  from tsfresh.feature_selection.significance_tests import target_binary_feature_binary_test, target_binary_feature_real_test, target_real_feature_binary_test, target_real_feature_real_test
label_desc: Use image node_id 1 for calling a global function with example usage: binary_series_with_nan() and returns: pd