datapad.fields.get

datapad.fields.get(key, default=None)

Constructs a function F(data) to get a field-value given a field-key from a list or dict. If a field-key is not present in data, return default value. This function is commonly used as a keying-function for Sequence.map, Sequence.sort, Sequence.groupby, and Sequence.join.

Examples

In the examples below, assume data is an element or row coming from a Sequence.

>>> F = get('a', 'foobar')
>>> F({'a': 1})
1
>>> F({'b': 2})
'foobar'

>>> F = get(0, "default")
>>> F([10])
10

>>> F = get(1, "default")
>>> F([10])
'default'