### methodtools.lru_cache usage

Source: https://methodtools.readthedocs.io/en/latest/index.html

Demonstrates how to use methodtools.lru_cache with methods, classmethods, and staticmethods.

```python
from methodtools import lru_cache

class A(object):

    # cached method. the storage lifetime follows `self` object
    @lru_cache()
    def cached_method(self, args):
        ...

    # cached classmethod. the storage lifetime follows `A` class
    @lru_cache()  # the order is important!
    @classmethod  # always lru_cache on top of classmethod
    def cached_classmethod(self, args):
        ...

    # cached staticmethod. the storage lifetime follows `A` class
    @lru_cache()  # the order is important!
    @staticmethod  # always lru_cache on top of staticmethod
    def cached_staticmethod(self, args):
        ...

@lru_cache()  # just same as functools.lru_cache
def cached_function():
    ...

```

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