"Safe" attribute getter operators for python. Useful when exploring data in a REPL for debugging.
import k
name = k.name(user)
Works on object attributes and string dictionary keys. List indexes, too:
first_message = k.messages[0](user)
But if it encounters a list with a non-list key, it will map over the list:
names = k.name(users)
message_bodies = k.messages.body(users) # list of lists [[body1, b2], [b3, b4], ..]
If you'd like you can flatten lists of lists:
mbs = k.messages(flatten=True).body(users) # list [body1, b2, b3, b4, ..]
If you access a non-present attribute, instead of throwing an exception, it will just return None. This is helpful if objects have heterogeneous attributes.
coaches = k.coach(users) # [coach1, None, coach2]
You can combine two k instances with + and it will merge them into a dictionary keyed by the path.
(k.first_name + k.last_name)(users) # [{'first_name':'foo', 'last_name':'bar'}, ..]
k._ will return 'self', which can be helpful when doing combinations.
user = k._ + k.coach.id(user)
k.__(o) will return o.__dict__, which is also helpful for debugging.