code: def read_entry(self, entry):
          
          if not self.is_entry_safe(entry):
              self.log([u"Accessing entry '%s' is not safe", entry])
              return None
  
          if entry not in self.entries:
              self.log([u"Entry '%s' not found in this container", entry])
              return None
  
          self.log([u"Reading contents of entry '%s'", entry])
          try:
              return self.actual_container.read_entry(entry)
          except:
              self.log([u"An error occurred while reading the contents of '%s'", entry])
              return None
docs: Read the contents of an entry in this container,
          and return them as a byte string.
  
          Return ``None`` if the entry is not safe
          or it cannot be found.
  
          :rtype: byte string
          :raises: same as :func:`~aeneas.container.Container.entries`