code: def use_ascii(self):
      poly.set_default_printstyle("ascii")
  
imports: from math import nan, inf
  import pytest
  from numpy.core import array, arange, printoptions
  import numpy.polynomial
  from numpy.testing import assert_equal, assert_
  from fractions import Fraction
  from decimal import Decimal
label_desc: Use image node_id 1 for calling the TestLinebreaking obj's underlying member method code with example usage: obj.use_ascii() without return types