I have a list of class objects, e.g.:
child1 = Child(Name = 'Max', height = 5.1, weight = 100)
child2 = Child(Name = 'Mimi, height = 4.1, weight = 80)
my_object_list = [child1, child2]
Is there a way to create a new list dynamically with one similiar attribute of each object as a one liner? I know how to do it in a for loop, that’s why I am explicitely asking for a one liner.
desired result: my_new_list = ['Max', 'Mimi']
Many Thanks in advance
>Solution :
this kind of things is made easy by the comprehension syntax in Python;
my_new_list = [item.name for item in old_list]
Now, if one does not know at coding-time which attribute should be retrieved, the getattr built-in can be used to retrieve an attribute by name passed as a string:
attr = 'name'
my_new_list = [geattr(item, attr) for item in old_list]`
Or also, operator.attrgetter:
from operator import attrgetter
op = attrgetter("name")
new_list = [op(item) for item in old_list]
# and this looks pretty when used with "map" as well:
name_iterator = map(op, old_list)