a simple keystore system in Python. Multiple values can be stored in a single key, and are retrieved based on time of creation.

timeKeystore.py

import time

class keyStore:
    def __init__(self):
        self.storage = {}
        
    def put(self, key, value):
        # create array if it doesn't exist
        if key not in self.storage:
            self.storage[key] = []
            
        # store value with current time
        self.storage[key].append(value, time.time())
                   
    def get(self, key, timestamp = None):
        # check if key has ever been stored
        if key not in self.storage:
            return None
        
        # get newest value if no timestamp specified
        if(timestamp == None):
            timestamp = time.time()
        
        # loop through key's array backwards
        for item in reversed(self.storage[key]):
            # if item is newer or equal to specified timestamp, return value
            if(item[1] <= timestamp):
                return item[0]