Ticket #169 (closed defect: wontfix)
PyYAML fails to load mapping keys of sequence type
|Reported by:||sedie@…||Owned by:||xi|
Description (last modified by xi) (diff)
The following YAML code is taken directly from an example given in the YAML 1.1 specification and fails to load with PyYAML, giving the error message: found unacceptable key (unhashable type: 'list').
--- ? - Detroit Tigers - Chicago cubs : - 2001-07-23 ? [ New York Yankees, Atlanta Braves ] : [ 2001-07-02, 2001-08-12, 2001-08-14 ] ...
The problem most likely arises because Python lists are not hashable and cannot be used as dict keys. A possible solution may be to detect this special case and coerce YAML !!seq types to Python tuples before constructing the dictionaries that they are a part of.