code: def test_get_string():
      assert _get_string(5.0) == "5"
      assert _get_string(5.123) == "5.12"
      assert _get_string(5.1) == "5.1"
      assert _get_string(3) == "3"
      assert _get_string(-3.14) == "-3.14"
      assert _get_string(0.0) == "0"
  
imports: import pandas
  import numpy
  import pytest
  from pdpbox.utils import FeatureInfo, _to_rgba, _check_col, _check_dataset, _make_list, _check_model, _check_classes, _check_memory_limit, _check_frac_to_plot, _calc_n_jobs, _get_string, _expand_params_for_interact, _calc_preds, _check_cluster_params, _check_plot_engine, _check_pdp_interact_plot_type
label_desc: Use image node_id 9 for calling a global function with example usage: test_get_string() without return types