old_contents: import pika
  import threading
  from flask import current_app
  
  # Find the stack on which we want to store the database connection.
  # Starting with Flask 0.9, the _app_ctx_stack is the correct one,
  # before that we need to use the _request_ctx_stack.
  try:
      from flask import _app_ctx_stack as stack
  except ImportError:
      from flask import _request_ctx_stack as stack
  
  
  class Pika(object):
  
      def __init__(self, app=None, pika_params = None):
          self.app = app
          if app is not None:
              self.init_app(app, pika_params)
  
      def init_app(self, app, pika_params):
          # Use the newstyle teardown_appcontext if it's available,
          # otherwise fall back to the request context
          if pika_params is None:
              pika_params = app.config.get('PIKA_PARAMS', None)
          if 'credentials' not in pika_params:
  	        pika_params['credentials'] = pika.PlainCredentials(
                      app.config.get('username'),
                      app.config.get('password'))
          self._pika_connection_params = pika.ConnectionParameters(**pika_params)
          self._threadLocal = threading.local()
          if hasattr(app, 'teardown_appcontext'):
              app.teardown_appcontext(self.teardown)
          else:
              app.teardown_request(self.teardown)
  
      def create_channel(self):
          pika_connection = getattr(self._threadLocal, 'pika_connection', None)
          if pika_connection is None or not pika_connection.is_open :
              #Create connection
              pika_connection = pika.BlockingConnection(self._pika_connection_params)
              self._threadLocal.pika_connection = pika_connection
          return pika_connection.channel()
  
      def teardown(self, exception):
          ctx = stack.top
          if hasattr(ctx, 'pika_channel'):
              ctx.pika_channel.close()
  
      @property
      def channel(self):
          ctx = stack.top
          if ctx is not None:
              if not hasattr(ctx, 'pika_channel'):
                  ctx.pika_channel = self.create_channel()
              return ctx.pika_channel
  
new_contents: import pika
  import threading
  from flask import current_app
  
  # Find the stack on which we want to store the database connection.
  # Starting with Flask 0.9, the _app_ctx_stack is the correct one,
  # before that we need to use the _request_ctx_stack.
  try:
      from flask import _app_ctx_stack as stack
  except ImportError:
      from flask import _request_ctx_stack as stack
  
  
  class Pika(object):
  
      def __init__(self, app=None, pika_params = None):
          self.app = app
          if app is not None:
              self.init_app(app, pika_params)
  
      def init_app(self, app, pika_params = None):
          # Use the newstyle teardown_appcontext if it's available,
          # otherwise fall back to the request context
          if pika_params is None:
              pika_params = app.config.get('PIKA_PARAMS', None)
          if 'credentials' not in pika_params:
              pika_params['credentials'] = pika.PlainCredentials(pika_params['username'], pika_params['password'])
              del pika_params['username']
              del pika_params['password']
          self._pika_connection_params = pika.ConnectionParameters(**pika_params)
          self._threadLocal = threading.local()
          if hasattr(app, 'teardown_appcontext'):
              app.teardown_appcontext(self.teardown)
          else:
              app.teardown_request(self.teardown)
  
      def create_channel(self):
          pika_connection = getattr(self._threadLocal, 'pika_connection', None)
          if pika_connection is None or not pika_connection.is_open :
              #Create connection
              pika_connection = pika.BlockingConnection(self._pika_connection_params)
              self._threadLocal.pika_connection = pika_connection
          return pika_connection.channel()
  
      def teardown(self, exception):
          ctx = stack.top
          if hasattr(ctx, 'pika_channel'):
              ctx.pika_channel.close()
  
      @property
      def channel(self):
          ctx = stack.top
          if ctx is not None:
              if not hasattr(ctx, 'pika_channel'):
                  ctx.pika_channel = self.create_channel()
              return ctx.pika_channel
  
subject: Fix syntax errors