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How to use on_evict method in hypothesis

Best Python code snippet using hypothesis

lru.py

Source:lru.py

1from __future__ import absolute_import, division, print_function2from heapdict import heapdict3from .common import ZictBase, close4def do_nothing(k, v):5    pass6class LRU(ZictBase):7    """ Evict Least Recently Used Elements8    Parameters9    ----------10    n: int11        Number of elements to keep, or total weight if weight= is used12    d: MutableMapping13        Dictionary in which to hold elements14    on_evict: list of callables15        Function:: k, v -> action to call on key value pairs prior to eviction16    weight: callable17        Function:: k, v -> number to determine the size of keeping the item in18        the mapping.  Defaults to ``(k, v) -> 1``19    Examples20    --------21    >>> lru = LRU(2, dict(), on_evict=lambda k, v: print("Lost", k, v))22    >>> lru['x'] = 123    >>> lru['y'] = 224    >>> lru['z'] = 325    Lost x 126    """27    def __init__(self, n, d, on_evict=None, weight=lambda k, v: 1):28        self.d = d29        self.n = n30        self.heap = heapdict()31        self.i = 032        if callable(on_evict):33            on_evict = [on_evict]34        self.on_evict = on_evict or []35        self.weight = weight36        self.total_weight = 037        self.weights = dict()38    def __getitem__(self, key):39        result = self.d[key]40        self.i += 141        self.heap[key] = self.i42        return result43    def __setitem__(self, key, value):44        if key in self.d:45            del self[key]46        weight = self.weight(key, value)47        if weight <= self.n:48            self.d[key] = value49            self.i += 150            self.heap[key] = self.i51            self.weights[key] = weight52            self.total_weight += weight53        else:54            for cb in self.on_evict:55                cb(key, value)56        while self.total_weight > self.n:57            self.evict()58    def evict(self):59        """ Evict least recently used key60        This is typically called from internal use, but can be externally61        triggered as well.62        Returns63        -------64        k: key65        v: value66        w: weight67        """68        k, priority = self.heap.popitem()69        weight = self.weights.pop(k)70        self.total_weight -= weight71        v = self.d.pop(k)72        for cb in self.on_evict:73            cb(k, v)74        return k, v, weight75    def __delitem__(self, key):76        del self.d[key]77        del self.heap[key]78        self.total_weight -= self.weights.pop(key)79    def keys(self):80        return self.d.keys()81    def values(self):82        return self.d.values()83    def items(self):84        return self.d.items()85    def __len__(self):86        return len(self.d)87    def __iter__(self):88        return iter(self.d)89    def __contains__(self, key):90        return key in self.d91    def __str__(self):92        sub = str(self.d) if not isinstance(self.d, dict) else 'dict'93        return '<LRU: %s/%s on %s>' % (self.total_weight, self.n, sub)94    __repr__ = __str__95    def flush(self):96        self.d.flush()97    def close(self):...

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