class_docstr: Null context manager.  Useful for conditionally adding a contextmanager in
  a single line, e.g.:
  
  with SomeContextManager() if some_expr else nullctx():
      do_stuff()
class_docstr_tok: ["Null","context","manager",".","Useful","for","conditionally","adding","a","contextmanager","in","a","single","line",",","e.g",".",":","with","SomeContextManager","(",")","if","some_expr","else","nullctx","(",")",":","do_stuff","(",")"]
code: def __enter__(self):
      return self
  
imports: from six import iteritems
label_desc: Use image node_id 1 for calling the nullctx obj's underlying member method code with example usage: obj.__enter__() and returns: self