{"library":"param","title":"Param","description":"Param is a zero-dependency Python library that enables the creation of classes with rich, declarative attributes (Parameter objects) for runtime validation, documentation, and serialization. It also provides a suite of expressive and composable APIs for reactive programming, allowing automatic updates on attribute changes and the declaration of complex reactive dependencies. Param is currently at version 2.3.3 and maintains a frequent release cadence with minor and patch updates.","language":"python","status":"active","last_verified":"Thu May 14","install":{"commands":["pip install param"],"cli":null},"imports":["import param","from param import Parameterized"],"auth":{"required":false,"env_vars":[]},"quickstart":{"code":"import param\n\nclass UserForm(param.Parameterized):\n    age = param.Integer(bounds=(0, None), doc='User age')\n    name = param.String(doc='User name')\n    submit = param.Event()\n\n    @param.depends('submit', watch=True)\n    def save_user_to_db(self):\n        print(f'Saving user to db: name={self.name}, age={self.age}')\n\nuser = UserForm(name='Alice', age=30)\nprint(f'Initial user name: {user.name}, age: {user.age}')\nuser.submit = True # Triggers save_user_to_db\n\nuser.name = 'Bob'\nuser.age = 25\nuser.submit = True # Triggers save_user_to_db with new values","lang":"python","description":"This quickstart demonstrates defining a `Parameterized` class with `Integer`, `String`, and `Event` parameters. It shows how to bind a method (`save_user_to_db`) to react to changes in the `submit` parameter using the `@param.depends` decorator. Changing parameter values and triggering the event causes the dependent method to execute.","tag":null,"tag_description":null,"last_tested":null,"results":[]},"compatibility":{"tag":null,"tag_description":null,"last_tested":"2026-05-14","installed_version":"2.2.1","pypi_latest":"2.3.3","is_stale":true,"summary":{"python_range":"3.10–3.9","success_rate":100,"avg_install_s":1.7,"avg_import_s":0.13,"wheel_type":"wheel"},"results":[{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine (musl)","variant":"param","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.08,"mem_mb":3.8,"disk_size":"18.8M"},{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine (musl)","variant":"param","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.09,"mem_mb":3.8,"disk_size":"18.8M"},{"runtime":"python:3.10-slim","python_version":"3.10","os_libc":"slim (glibc)","variant":"param","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":1.6,"import_time_s":0.05,"mem_mb":3.8,"disk_size":"19M"},{"runtime":"python:3.10-slim","python_version":"3.10","os_libc":"slim (glibc)","variant":"param","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.06,"mem_mb":3.8,"disk_size":"19M"},{"runtime":"python:3.11-alpine","python_version":"3.11","os_libc":"alpine (musl)","variant":"param","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.16,"mem_mb":4.8,"disk_size":"20.8M"},{"runtime":"python:3.11-alpine","python_version":"3.11","os_libc":"alpine (musl)","variant":"param","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.17,"mem_mb":4.8,"disk_size":"20.8M"},{"runtime":"python:3.11-slim","python_version":"3.11","os_libc":"slim (glibc)","variant":"param","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":1.7,"import_time_s":0.12,"mem_mb":4.8,"disk_size":"21M"},{"runtime":"python:3.11-slim","python_version":"3.11","os_libc":"slim (glibc)","variant":"param","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.13,"mem_mb":4.8,"disk_size":"21M"},{"runtime":"python:3.12-alpine","python_version":"3.12","os_libc":"alpine (musl)","variant":"param","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.12,"mem_mb":4.5,"disk_size":"12.7M"},{"runtime":"python:3.12-alpine","python_version":"3.12","os_libc":"alpine (musl)","variant":"param","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.15,"mem_mb":4.5,"disk_size":"12.7M"},{"runtime":"python:3.12-slim","python_version":"3.12","os_libc":"slim (glibc)","variant":"param","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":1.5,"import_time_s":0.12,"mem_mb":4.5,"disk_size":"13M"},{"runtime":"python:3.12-slim","python_version":"3.12","os_libc":"slim (glibc)","variant":"param","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.14,"mem_mb":4.5,"disk_size":"13M"},{"runtime":"python:3.13-alpine","python_version":"3.13","os_libc":"alpine (musl)","variant":"param","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.11,"mem_mb":4.6,"disk_size":"12.4M"},{"runtime":"python:3.13-alpine","python_version":"3.13","os_libc":"alpine (musl)","variant":"param","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.13,"mem_mb":4.6,"disk_size":"12.3M"},{"runtime":"python:3.13-slim","python_version":"3.13","os_libc":"slim (glibc)","variant":"param","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":1.6,"import_time_s":0.11,"mem_mb":4.6,"disk_size":"13M"},{"runtime":"python:3.13-slim","python_version":"3.13","os_libc":"slim (glibc)","variant":"param","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.13,"mem_mb":4.6,"disk_size":"13M"},{"runtime":"python:3.9-alpine","python_version":"3.9","os_libc":"alpine (musl)","variant":"param","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.17,"mem_mb":6.4,"disk_size":"18.2M"},{"runtime":"python:3.9-alpine","python_version":"3.9","os_libc":"alpine (musl)","variant":"param","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.2,"mem_mb":6.4,"disk_size":"18.2M"},{"runtime":"python:3.9-slim","python_version":"3.9","os_libc":"slim (glibc)","variant":"param","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":1.9,"import_time_s":0.15,"mem_mb":6.4,"disk_size":"19M"},{"runtime":"python:3.9-slim","python_version":"3.9","os_libc":"slim (glibc)","variant":"param","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.17,"mem_mb":6.4,"disk_size":"19M"}]}}