code: def bin_path(self, release=None):
          
          if release:
              for r in self.releases:
                  if release in r:
                      return self.releases[r]
              raise MongoOrchestrationError("No such release '%s' in %r"
                                            % (release, self.releases))
          if self.default_release:
              return self.releases[self.default_release]
          if self.releases:
              return list(self.releases.values())[0]
          return ''
docs: Get the bin path for a particular release.