code: def get_template(self, uri):
          
  
          try:
              if self.filesystem_checks:
                  return self._check(uri, self._collection[uri])
              else:
                  return self._collection[uri]
          except KeyError:
              u = re.sub(r'^\/+', '', uri)
              for dir in self.directories:
                  srcfile = posixpath.normpath(posixpath.join(dir, u))
                  if os.path.isfile(srcfile):
                      return self._load(srcfile, uri)
              else:
                  raise exceptions.TopLevelLookupException(
                                      "Cant locate template for uri %r" % uri)
docs: Return a :class:`.Template` object corresponding to the given
          ``uri``.
  
          .. note:: The ``relativeto`` argument is not supported here at the moment.