lineprofiler

Lineprofiler is a Python package that provides a line-by-line profiling of code execution time. It allows developers to identify performance bottlenecks within their Python scripts by measuring the time spent on each individual line of code. This is particularly useful for optimizing functions that appear to be slow but whose exact cause isn't immediately obvious.

The primary tool provided by lineprofiler is the kernprof script and the line_profiler decorator. The kernprof script is used to run a Python script under the profiler, and the line_profiler decorator is applied to specific functions that the user wishes to profile. When the decorated function is executed, lineprofiler records the time spent on each line within that function.

After execution, the results can be viewed using the `kernprof -l -v your_script.py` command. The output displays the function name, the total time spent in the function, the number of times each line was executed, the time per call for each line, and the percentage of total time spent on each line. This granular information helps pinpoint exactly which lines of code are consuming the most execution time.

Lineprofiler is a valuable tool for Python developers focused on performance optimization. It offers a more detailed view than standard profilers, enabling precise identification and resolution of performance issues.