[Tutor] searching for a string in a dictionary

[Alan Gauld]

> doesTypeExist=filter(lambda x: typeofstring in x.type, all_types)
>
> if 'teststring' in [s.type for s in all_types]
> this works which is better in terms of speed???

These do two different things.
The first returns a list of all_types entries that match
The second returns true or false if *any* string matches.

The first can be rewritten without lambda using a list comprehension:

[ item for item in all_types if teststring in item['type'] ]

Calling functions in python is usually fairly slow so using 
filter/lambda
with its function call per item is probably slower than either of the
list comprehension methods. If in doubt measure it...

Alan G.