code: def test_polar_second_call():
      # the first call creates the axes with polar projection
      (ln1,) = plt.polar(0.0, 1.0, "ro")
      assert isinstance(ln1, mpl.lines.Line2D)
      # the second call should reuse the existing axes
      (ln2,) = plt.polar(1.57, 0.5, "bo")
      assert isinstance(ln2, mpl.lines.Line2D)
      assert ln1.axes is ln2.axes
  
imports: import difflib
  import numpy
  import sys
  from pathlib import Path
  import pytest
  import matplotlib
  from matplotlib.testing import subprocess_run_for_testing
  from matplotlib import pyplot
label_desc: Use image node_id 18 for calling a global function with example usage: test_polar_second_call() without return types