code: def test_backslash(self):
      self.t(r"'a\'b'", "'_L1_'")
      self.t(r"'a\\'", "'_L1_'")
      self.t(r"'a\\\'b'", "'_L1_'")
  
file_path: catboost/contrib/tools/cython/Cython/Build/Tests/TestStripLiterals.py
imports: from Cython.Build.Dependencies import strip_string_literals
  from Cython.TestUtils import CythonTest
label_desc: Use image node_id 7 for calling the TestStripLiterals obj's underlying member method code with example usage: obj.test_backslash() without return types