adii1823
58 lines
1.4 KiB
Python
58 lines
1.4 KiB
Python
# oop/cached.property.py
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from functools import cached_property
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class Client:
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def __init__(self):
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print("Setting up the client...")
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def query(self, **kwargs):
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print(f"Performing a query: {kwargs}")
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class Manager:
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@property
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def client(self):
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return Client()
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def perform_query(self, **kwargs):
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return self.client.query(**kwargs)
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class ManualCacheManager:
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@property
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def client(self):
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if not hasattr(self, '_client'):
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self._client = Client()
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return self._client
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def perform_query(self, **kwargs):
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return self.client.query(**kwargs)
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class CachedPropertyManager:
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@cached_property
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def client(self):
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return Client()
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def perform_query(self, **kwargs):
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return self.client.query(**kwargs)
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manager = CachedPropertyManager()
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manager.perform_query(object_id=42)
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manager.perform_query(name_ilike='%Python%')
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del manager.client # This causes a new Client on next call
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manager.perform_query(age_gte=18)
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"""
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$ python cached.property.py
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Setting up the client... # New Client
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Performing a query: {'object_id': 42} # first query
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Performing a query: {'name_ilike': '%Python%'} # second query
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Setting up the client... # Another Client
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Performing a query: {'age_gte': 18} # Third query
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"""
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