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(python2.1-ref.info)Dictionary displays

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Dictionary displays
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A dictionary display is a possibly empty series of key/datum pairs
enclosed in curly braces:

     dict_display:   "{" [key_datum_list] "}"
     key_datum_list: key_datum ("," key_datum)* [","]
     key_datum:      expression ":" expression

A dictionary display yields a new dictionary object.

The key/datum pairs are evaluated from left to right to define the
entries of the dictionary: each key object is used as a key into the
dictionary to store the corresponding datum.

Restrictions on the types of the key values are listed earlier in
section Note: standard type hierarchy.  (To summarize,the key type
should be hashable, which excludes all mutable objects.)  Clashes
between duplicate keys are not detected; the last datum (textually
rightmost in the display) stored for a given key value prevails.