code: def test_structure_format_float(self):
      # See #8172
      array_scalar = np.array(
          (1.0, 2.1234567890123456789, 3.0), dtype=("f8,f8,f8")
      )
      assert_equal(
          np.array2string(array_scalar), "(1., 2.12345679, 3.)"
      )
  
imports: import sys
  import gc
  from hypothesis import given
  from hypothesis.extra import numpy
  import pytest
  import numpy
  from numpy.testing import assert_, assert_equal, assert_raises, assert_warns, HAS_REFCOUNT, assert_raises_regex
  from numpy.core.arrayprint import _typelessdata
  import textwrap
label_desc: Use image node_id 6 for calling the TestArray2String obj's underlying member method code with example usage: obj.test_structure_format_float() without return types