Hi, In ChainMap example c = ChainMap() # Create root context d = c.new_child() # Create nested child context e = c.new_child() # Child of c, independent from d e.maps[0] # Current context dictionary -- like Python's locals() e.maps[-1] # Root context -- like Python's globals() e.parents # Enclosing context chain -- like Python's nonlocals d['x'] # Get first key in the chain of contexts d['x'] = 1 # Set value in current context d['x'] - will raise key does not exist error so simple fix is to flip last two lines... I know, possibly anal but look love Python and would like to help new folks to not get confused if they play with example in cPython shell... --best
I will flip the two because there is not downside. However, the table of wasn't intended to be a sequential example (that's why there is no data or display of result). Instead, it was just meant to be table of typing-this-does-that.
Agree, and I know. On Nov 8, 2017 3:41 PM, "Raymond Hettinger" <report@bugs.python.org> wrote: > > Raymond Hettinger <raymond.hettinger@gmail.com> added the comment: > > I will flip the two because there is not downside. However, the table of > wasn't intended to be a sequential example (that's why there is no data or > display of result). Instead, it was just meant to be table of > typing-this-does-that. > > ---------- > assignee: docs@python -> rhettinger > nosy: +rhettinger > priority: normal -> low > > _______________________________________ > Python tracker <report@bugs.python.org> > <https://bugs.python.org/issue31982> > _______________________________________ >
