old_contents: import sys
  
  class TeamcityServiceMessages:
      quote = {"'": "|'", "|": "||", "\n": "|n", "\r": "|r", ']': '|]'}
      
      def __init__(self, output=sys.stdout, prepend_linebreak=False):
          self.output = output
          self.prepend_linebreak = prepend_linebreak
      
      def escapeValue(self, value):
          if sys.version_info[0] <= 2 and isinstance(value, unicode):
              s = value.encode("utf-8")
          else:
              s = str(value)
          return "".join([self.quote.get(x, x) for x in s])
      
      def message(self, messageName, **properties):
          s = "##teamcity[" + messageName
          for k, v in properties.items():
              if v is None:
                  continue
              s = s + " %s='%s'" % (k, self.escapeValue(v))
          s += "]\n"
  
          if self.prepend_linebreak: self.output.write("\n")
          self.output.write(s)
  
      def testSuiteStarted(self, suiteName, location=None):
          self.message('testSuiteStarted', name=suiteName, locationHint=location)
  
      def testSuiteFinished(self, suiteName):
          self.message('testSuiteFinished', name=suiteName)
  
      def testStarted(self, testName, location=None):
          self.message('testStarted', name=testName, locationHint=location)
  
      def testFinished(self, testName, duration=None):
          self.message('testFinished', name=testName, duration=duration)
  
      def testIgnored(self, testName, message=''):
          self.message('testIgnored', name=testName, message=message)
          
      def testFailed(self, testName, message='', details='', expected='', actual=''):
        if expected and actual:
          self.message('testFailed', type='comparisonFailure', name=testName, message=message,
                     details=details, expected=expected, actual=actual)
        else:
          self.message('testFailed', name=testName, message=message, details=details)
  
      def testError(self, testName, message='', details=''):
          self.message('testFailed', name=testName, message=message, details=details, error="true")
          
      def testStdOut(self, testName, out):
          self.message('testStdOut', name=testName, out=out)
  
      def testStdErr(self, testName, out):
          self.message('testStdErr', name=testName, out=out)
  
      def testCount(self, count):
          self.message('testCount', count=count)
  
      def testMatrixEntered(self):
          self.message('enteredTheMatrix')
  
new_contents: import sys
  
  class TeamcityServiceMessages:
      quote = {"'": "|'", "|": "||", "\n": "|n", "\r": "|r", ']': '|]', '[': '|['}
      
      def __init__(self, output=sys.stdout, prepend_linebreak=False):
          self.output = output
          self.prepend_linebreak = prepend_linebreak
      
      def escapeValue(self, value):
          if sys.version_info[0] <= 2 and isinstance(value, unicode):
              s = value.encode("utf-8")
          else:
              s = str(value)
          return "".join([self.quote.get(x, x) for x in s])
      
      def message(self, messageName, **properties):
          s = "##teamcity[" + messageName
          for k, v in properties.items():
              if v is None:
                  continue
              s = s + " %s='%s'" % (k, self.escapeValue(v))
          s += "]\n"
  
          if self.prepend_linebreak: self.output.write("\n")
          self.output.write(s)
  
      def testSuiteStarted(self, suiteName, location=None):
          self.message('testSuiteStarted', name=suiteName, locationHint=location)
  
      def testSuiteFinished(self, suiteName):
          self.message('testSuiteFinished', name=suiteName)
  
      def testStarted(self, testName, location=None):
          self.message('testStarted', name=testName, locationHint=location)
  
      def testFinished(self, testName, duration=None):
          self.message('testFinished', name=testName, duration=duration)
  
      def testIgnored(self, testName, message=''):
          self.message('testIgnored', name=testName, message=message)
          
      def testFailed(self, testName, message='', details='', expected='', actual=''):
        if expected and actual:
          self.message('testFailed', type='comparisonFailure', name=testName, message=message,
                     details=details, expected=expected, actual=actual)
        else:
          self.message('testFailed', name=testName, message=message, details=details)
  
      def testError(self, testName, message='', details=''):
          self.message('testFailed', name=testName, message=message, details=details, error="true")
          
      def testStdOut(self, testName, out):
          self.message('testStdOut', name=testName, out=out)
  
      def testStdErr(self, testName, out):
          self.message('testStdErr', name=testName, out=out)
  
      def testCount(self, count):
          self.message('testCount', count=count)
  
      def testMatrixEntered(self):
          self.message('enteredTheMatrix')
  
subject: Update escaped char.