class_docstr: An abstract base class for context managers. Supported in contextlib from python 3.6 and up 
docstr: Return `self` upon entering the runtime context.
docstr_tok: ["Return","`","self","`","upon","entering","the","runtime","context","."]
code: def __enter__(self):
      """Return `self` upon entering the runtime context."""
      return self
  
imports: import abc
  import six
label_desc: Use image node_id 1 for calling the AbstractContextManager obj's underlying member method code with example usage: obj.__enter__() and returns: self