Python: access class properties as array

Question

Originally i'd like to make a class that has a few string and float properties, one being a timestamp in float format. having a list of ~10'000 instances of that class i'd like use those 10'000 timestamps as if I had a numpy array for math operations of vectors:

import random
import time

class myclass:
def __init__(self):

    # some properties
    self.ID=random.random()
    self.text1 = 'sometext'
    self.text2 = 'some other text'
    self.timestamp=time.time()

if __name__ == "__main__":
    for i in range(10):
        mylist.append(myclass())

    # now apply math functions to the timestamps, for example 
    # max([all timestamps]) or sum([all timestamps])

I could just have a row in an array instead of a class instance, but then many advantages (not shown here) of using classes are lost.

Can you help me?

Answer 1

Use operator.attrgetter to create a callable for the timestamp; use it with map on the list of instances; consume the map object with sum or max .

from operator import attrgetter
tstamp = attrgetter('timestamp')
print(sum(map(tstamp, mylist)))
print(max(map(tstamp, mylist)))