Find object by its member inside a List in python
find, list, python, search
Solution
You might want to pre-index them -
from collections import defaultdict
class Mock(object):
age_index = defaultdict(list)
def __init__(self, name, age):
self.name = name
self.age = age
Mock.age_index[age].append(self)
@classmethod
def find_by_age(cls, age):
return Mock.age_index[age]
Edit: a picture is worth a thousand words:
X axis is number of Mocks in myList, Y axis is runtime in seconds.
- red dots are @dcrooney's filter() method
- blue dots are @marshall.ward's list comprehension
- green dots hiding behind the X axis are my index ;-)
Problem
lets assume the following simple Object: ``` class Mock: def __init__(self, name, age): self.name = name self.age = age ``` then I have a list with some Objects like this: ``` myList = [Mock("Dan", 34), Mock("Jack", 30), Mock("Oli", 23)...] ``` Is there some built-in feature where I can get all Mocks with an age of ie 30? Of course I can iterate myself over them and compare their ages, but something like ``` find(myList, age=30) ``` would be nice. Is there something like that?