psutil
psutil (process and system utilities) is a cross-platform Python library for retrieving information on running processes and system utilization (CPU, memory, disks, network, sensors). It provides an easy-to-use interface for system monitoring, profiling, and limiting process resources. The library is widely used for building system administration tools, performance monitoring applications, and resource management scripts.
Developers should learn psutil when they need to monitor or manage system resources in Python applications, such as in DevOps tools, performance dashboards, or automated system administration scripts. It's particularly useful for tasks like tracking CPU/memory usage of processes, killing rogue processes, or gathering system metrics for logging and alerting in production environments.