{"id":894,"library":"limits","title":"Rate Limiting Utilities","description":"limits is a Python library for rate limiting via multiple strategies with commonly used storage backends such as Redis, Memcached, MongoDB, and Valkey. It provides identical APIs for use in synchronous and asynchronous codebases, enabling robust control over request rates. The library maintains an active development status with regular releases, with version 5.8.0 being the latest stable release at the time of verification.","status":"active","version":"5.8.0","language":"python","source_language":"en","source_url":"https://github.com/alisaifee/limits","tags":["rate-limiting","concurrency","web","async","redis","memcached","mongodb","api"],"install":[{"cmd":"pip install limits","lang":"bash","label":"Core library"},{"cmd":"pip install 'limits[redis]' # For Redis storage","lang":"bash","label":"With Redis support"},{"cmd":"pip install 'limits[memcached]' # For Memcached storage","lang":"bash","label":"With Memcached support"},{"cmd":"pip install 'limits[mongodb]' # For MongoDB storage","lang":"bash","label":"With MongoDB support"},{"cmd":"pip install 'limits[async-redis]' # For Async Redis storage","lang":"bash","label":"With Async Redis support"},{"cmd":"pip install 'limits[all]' # Installs all optional dependencies","lang":"bash","label":"All optional dependencies"}],"dependencies":[{"reason":"Requires Python 3.10 or newer.","package":"python","optional":false},{"reason":"Optional, for Redis storage backend.","package":"redis","optional":true},{"reason":"Optional, for Memcached storage backend.","package":"memcache","optional":true},{"reason":"Optional, for MongoDB storage backend.","package":"pymongo","optional":true},{"reason":"Optional, for async Redis storage backend.","package":"coredis","optional":true},{"reason":"Optional, for Valkey storage backend.","package":"valkey","optional":true}],"imports":[{"symbol":"strategies","correct":"from limits import strategies"},{"symbol":"storage","correct":"from limits import storage"},{"symbol":"RateLimitItem","correct":"from limits import RateLimitItem"},{"note":"`LimitedError` is from `throttled-py` library, `RateLimitExceeded` is for `limits`.","wrong":"from limits.errors import LimitedError","symbol":"RateLimitExceeded","correct":"from limits.errors import RateLimitExceeded"},{"symbol":"parse","correct":"from limits import parse"},{"symbol":"parse_many","correct":"from limits import parse_many"}],"quickstart":{"code":"from limits import parse, strategies, storage, RateLimitExceeded\nimport time\nimport os\n\n# 1. Initialize a storage backend\n# For simplicity, using in-memory storage. For production, use Redis/Memcached.\n# A Redis example:\n# REDIS_URL = os.environ.get('REDIS_URL', 'redis://localhost:6379')\n# store = storage.RedisStorage(REDIS_URL)\n\nstore = storage.MemoryStorage()\n\n# 2. Define a rate limit (e.g., 5 requests per minute)\n# parse() converts a string like '5/minute' into a RateLimitItem\nrate_limit_string = '5/minute'\nrate_limit = parse(rate_limit_string)\n\n# 3. Initialize a rate limiter strategy\n# FixedWindowRateLimiter is a common strategy\nlimiter = strategies.FixedWindowRateLimiter(store)\n\ndef do_limited_action(user_id):\n    try:\n        # 4. Test the limit for a specific identifier (e.g., user_id)\n        if limiter.test(rate_limit, user_id):\n            # 5. Consume the limit (i.e., record a hit)\n            limiter.hit(rate_limit, user_id)\n            print(f\"[{user_id}] Action performed at {time.strftime('%H:%M:%S')}. Remaining: {limiter.get_remaining(rate_limit, user_id)}\")\n        else:\n            raise RateLimitExceeded(rate_limit)\n    except RateLimitExceeded as e:\n        # Query available capacity and reset time\n        remaining = limiter.get_remaining(e.limit, user_id)\n        reset_at = limiter.get_reset_time(e.limit, user_id)\n        print(f\"[{user_id}] Rate limit exceeded for {e.limit}. Try again in {reset_at - time.time():.1f} seconds. Remaining: {remaining}\")\n\n# Simulate some requests\nuser = \"test_user_1\"\nprint(f\"--- Simulating requests for {user} ({rate_limit_string}) ---\")\nfor i in range(7):\n    do_limited_action(user)\n    time.sleep(1) # Simulate some delay\n\nprint(\"\\n--- Waiting for reset time ---\")\ntime.sleep(60)\n\nprint(\"\\n--- Simulating requests after reset ---\")\nfor i in range(3):\n    do_limited_action(user)\n    time.sleep(1)\n","lang":"python","description":"This quickstart demonstrates how to set up a simple rate limit using in-memory storage. It defines a rate limit, initializes a fixed-window rate limiter, and then simulates multiple actions for a user, demonstrating how the `test` and `hit` methods interact with `RateLimitExceeded` exceptions. It also shows how to get remaining quota and reset time."},"warnings":[{"fix":"Review your application's rate limiting strategies and storage configurations. If using `Fixed Window with Elastic Expiry` or `etcd`, migrate to an alternative strategy/storage. If using `async+memcached`, ensure `memcachio` is compatible or manually configure `emcache` if preferred and still supported via an extra.","message":"Version 5.0.0 introduced several backward-incompatible changes, including dropping support for the `Fixed Window with Elastic Expiry` strategy and the `etcd` storage backend. Additionally, the default implementation for `async+memcached` was changed from `emcache` to `memcachio`.","severity":"breaking","affected_versions":">=5.0.0"},{"fix":"For production or distributed applications, configure a shared storage backend such as Redis, Memcached, or MongoDB. These backends enable centralized rate limit tracking across multiple application instances.","message":"Using `MemoryStorage` (the default in basic examples) in a multi-process or distributed environment will not provide a global rate limit. Each process will have its own independent rate counter, which can lead to limits being exceeded across the entire system.","severity":"gotcha","affected_versions":"All"},{"fix":"For development or build automation, ensure your tooling is compatible with `pyproject.toml` and `hatch`. Direct users are generally unaffected unless they interact with the build system.","message":"When migrating from `limits` versions prior to 5.6.0, note that project metadata moved to `pyproject.toml` and the project now uses `hatch` for package builds. While this primarily affects contributors, it's worth noting for build system interactions.","severity":"gotcha","affected_versions":"<5.6.0 to >=5.6.0"},{"fix":"Always check the `limits` library's `requires` and `Provides-Extra` on PyPI or the `pyproject.toml` for the most up-to-date dependency compatibility, especially when upgrading or installing specific optional backends.","message":"Older versions of `limits` (e.g., prior to v2.7.0 and v2.4.0) had specific requirements for `redis` and `coredis` versions. While current versions relax these, always verify compatibility.","severity":"deprecated","affected_versions":"<2.7.0"}],"env_vars":null,"last_verified":"2026-05-12T21:02:11.333Z","next_check":"2026-06-27T00:00:00.000Z","problems":[{"fix":"Install the library using pip: `pip install limits`","cause":"The 'limits' library is not installed in your Python environment or is not accessible via the Python path.","error":"ModuleNotFoundError: No module named 'limits'"},{"fix":"Install the necessary backend client (e.g., `pip install redis` for Redis) and ensure your connection URI is correct and the server is accessible.","cause":"The specified storage backend (Redis in this case) requires its corresponding Python client library to be installed, which is missing, or the connection URI is invalid/unreachable.","error":"ConfigurationError: redis library is not available"},{"fix":"This is an expected behavior of rate limiting. To handle it gracefully, catch the `RateLimitExceeded` exception and implement retry logic, inform the user to wait, or adjust your application's request rate. For example, `try: ... except RateLimitExceeded: print('Rate limit hit, please wait.')`","cause":"The configured rate limit for a specific operation or endpoint has been exceeded, preventing further execution until the limit resets.","error":"limits.errors.RateLimitExceeded: 5 per 1 minute"},{"fix":"Ensure you are passing the `Rate` object to the appropriate `limits` function or decorator (e.g., `limiter.hit(rate)`) instead of trying to execute it like a function.","cause":"This error can occur if you attempt to call a `Rate` object directly as a function, rather than using it as an argument for rate limiting functions or decorators.","error":"TypeError: 'Rate' object is not callable"},{"fix":"Review the `limits` library's API documentation for the specific object you are using to ensure you are calling the correct attributes or methods and that your object is correctly initialized.","cause":"You are attempting to access an attribute or method on a `limits` object (e.g., a `Storage` or `Limiter` instance) that does not exist or is misspelled. This can also happen with incorrect usage of decorators.","error":"AttributeError: 'X' object has no attribute 'Y'"}],"ecosystem":"pypi","meta_description":null,"install_score":100,"install_tag":"verified","quickstart_score":null,"quickstart_tag":null,"pypi_latest":"5.8.0","cli_name":"limits","install_checks":{"last_tested":"2026-05-12","tag":"verified","tag_description":"installs cleanly on critical runtimes, fast import, recently tested","results":[{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine (musl)","variant":"all","exit_code":0,"wheel_type":null,"failure_reason":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine (musl)","variant":"all","exit_code":0,"wheel_type":null,"failure_reason":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine 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