code: def test_paired_runs_exact():
      a = [3.67, 1.72, 3.46, 2.60, 2.03, 2.10, 3.01]
      b = [2.11, 1.79, 2.71, 1.89, 1.69, 1.71, 2.01]
      p = permutation_test(a, b, paired=True, method="exact")
      assert round(p, 3) == 0.031
  
file_path: mlxtend/mlxtend/evaluate/tests/test_permutation.py
imports: import numpy
  from mlxtend.evaluate import permutation_test
  from mlxtend.utils import assert_raises
label_desc: Use image node_id 9 for calling a global function with example usage: test_paired_runs_exact() without return types