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Python Reference Manual

Previous: 5.2.4 List displays Up: 5.2 Atoms Next: 5.2.6 String conversions

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5.2.5 Dictionary displays

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

Download entire grammar as text.

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 3.2. (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.  

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Python Reference Manual

Previous: 5.2.4 List displays Up: 5.2 Atoms Next: 5.2.6 String conversions

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Release 2.2.3, documentation updated on 30 May 2003.