Return the identity.
The identity is the first found of the following:
See also
| Parameters: |
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|---|---|
| Returns: |
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| Examples: |
>>> f.standard_name = 'Kelvin'
>>> f.id = 'foo'
>>> f.identity()
'Kelvin'
>>> del f.standard_name
>>> f.identity()
'foo'
>>> del f.id
>>> f.identity()
None
>>> f.identity('bar')
'bar'
>>> print f.identity()
None