Introduction to Diskcache

Diskcache is a powerful and efficient caching library in Python that stores cache data on disk. It is designed to handle large datasets and provides a persistent, lightweight cache mechanism for Python applications. With its ease of use and extensive API offerings, Diskcache can drastically improve the performance of Python applications.

Getting Started

To install Diskcache, you can use pip:

pip install diskcache

Basic Usage

 import diskcache as dc
cache = dc.Cache('/tmp/disk_cache') cache.set('key', 'value') print(cache.get('key'))  # Output: 'value' 

API Examples

Setting and Getting Items

 cache.set('user:1', {'name': 'John', 'age': 30}) user = cache.get('user:1') print(user)  # Output: {'name': 'John', 'age': 30} 

Deleting Items

 cache.delete('user:1') print(cache.get('user:1'))  # Output: None 

Cache Length

 cache.set('key1', 'value1') cache.set('key2', 'value2') print(len(cache))  # Output: 2 

Eviction Policies

 cache = dc.Cache('/tmp/disk_cache', size_limit=1024) cache.set('item1', 'A' * 512) cache.set('item2', 'B' * 512) cache.set('item3', 'C' * 512)  # This will evict older items to maintain size limit 

Statistics

 hits, misses = cache.statistics() print(f'Hits: {hits}, Misses: {misses}') 

App Example with Diskcache

Let’s create a simple web app using Flask and Diskcache.

 from flask import Flask, request import diskcache as dc
app = Flask(__name__) cache = dc.Cache('/tmp/disk_cache')
@app.route('/set', methods=['POST']) def set_cache():
  key = request.form['key']
  value = request.form['value']
  cache.set(key, value)
  return f'Set {key} to {value}'

@app.route('/get', methods=['GET']) def get_cache():
  key = request.args.get('key')
  value = cache.get(key)
  return f'{key}: {value}'

if __name__ == '__main__':
  app.run(debug=True)

In this example, we create two endpoints `/set` and `/get` to set and get cache values respectively. Diskcache helps tremendously in avoiding redundant computations and speeding up data retrieval in this web app.

Diskcache is a robust and scalable caching solution well-suited for diverse Python applications. From simple key-value storage to complex eviction policies, Diskcache provides a comprehensive API to address various caching needs.

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