code: def test_str_format(self):
      self.run_test(
          "def str_format(a): return '%.2f %.2f' % (a, a)",
          43.23,
          str_format=[float],
      )
  
imports: from pythran.tests import TestEnv
  from pythran.typing import List
  import unittest
label_desc: Use image node_id 31 for calling the TestStr obj's underlying member method code with example usage: obj.test_str_format() without return types