code: def escape_name(name):
      ret = "".join([i if i in _varname_charset else "_" for i in name])
      if ret.endswith("_"):
          return ret
      else:
          return ret + "_"
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import six
label_desc: Use image node_id 1 for calling a global function with example usage: escape_name(name) and returns: ret, unknown