Python expiring LRU

expiringlru.py

# License: Public Domain, use as you like, no warranty
import time
import threading
import pylru  # from pip

class ExpiringLRUCache(object):
    def __init__(self, size, exp=7200):
        self.exp = exp
        self.size = size
        self.lru = pylru.lrucache(size)
        self.lock = threading.Lock()
    def clear(self, key):
        with self.lock:
            try:
                del self.lru[key]
            except KeyError:
                pass
    def set(self, key, val, exp=None):
        kv = (time.time() + (exp or self.exp), val)
        with self.lock:
            self.lru[key] = kv
    def get(self, key):
        with self.lock:
            x = self.lru.get(key)
        if x is None:
            return None
        expts, val = x
        if expts < time.time():
            with self.lock:
                try:
                    del self.lru[key]
                except Exception:
                    pass
            return None
        return val