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The documentation for the readline module is a bit too minimal.
1) function 'add_history' is described at the end of the documentation,
 not near the other functions for manipulation the history stack.
2) the index for remove_history_item and replace_history_item is 0-
based,
 while the index for get_history_item is 1-based.
The latter is a confusing API in the underlying readline library and 
should IMO be described in Python's documentation.
(If readline were a new addition to the stdlib I'd prefer to fix the 
interface, but that would have too many backward compatibility issues at 
this point in time).