Use open source visualization tools to understand your Python code

osc_ 10loka5t 2020-11-15 14:04:50
use open source visualization tools

VizTracer Tools can visualize and track Python Code , Let you have a deeper understanding of how it works .

With Python Projects are getting bigger and bigger 、 More complicated , It's challenging to understand it . Even if you wrote the whole project yourself , It's impossible to know exactly how a project works . In order to understand your code better , Debugging and analyzing code becomes critical .

VizTracer  It's a tool like this , It's through tracking and Visualization Python Code execution process , To help you understand the code . There is no need to make any changes to the source code ,VizTracer You can record the entry of the function / exit , Function parameter / Return value and any variable , And then through  Trace-Viewer  Use an intuitive Google front-end interface to display data .

Here's a run Monte carlo tree search Example :

Monte Carlo tree search visualization

The time and time of each function are recorded on the stack , So you can see what happens when you run the program . You can zoom in to see the details of any particular point :

Zooming in on VizTracer visualization

VizTracer You can also automatically record function parameters and return values . You can click on the function entry and see the details :

Viewing VizTracer details

Or you can create a whole new signal , And use it to record variables . for example , This shows the cost value when performing gradient descent :

VizTracer gradient descent

Compared with other tools with complex settings ,VizTracer It's very simple to use , And there's no dependency . You can start your pip Install it :

pip install viztracer

You can also track your program by typing (<>  It's the name of your script ):

viztracer <>

VizTracer A... Will be generated in your working directory HTML The report , You can Chrome Open it in the browser .

VizTracer There are other advanced features , For example, the filter function , You can use it to filter out functions you don't want to track , Get a clearer report . for example , To include only the functions in the file , You need :

viztracer include_files ./ --run <>

Record function parameters and return values :

viztracer --log_function_args --log_return_value <>

Record any variable that matches a regular expression :

# log variables starts with a
viztracer --log_var a.* --run &lt;;

You can get other functions by making minor changes to the source code , For example, custom events are used to record values and objects .

VizTracer It also includes a virtual debugger (vdb), It can debug VizTracer Log file . It can be used vdb Debug your running code ( And  pdb  Very similar ) So that you can understand the code flow . What's useful is , It also supports time backtracking , Because it knows what happened .

It's different from some prototypes ,VizTracer Use pure C Language realizes its core , This will greatly reduce the cost , Make it similar to  cProfile  The level of .

VizTracer It's open source. , stay Apache 2.0 Release under license , Supports all common operating system platforms (Linux、macOS and Windows). You can  GitHub  Learn more about its features and access the source code .


author :Tian Gao  Topic selection :lujun9972  translator :xiao-song-123  proofreading :wxy

This paper is written by  LCTT  Original compilation ,Linux China   Honor roll out

本文为[osc_ 10loka5t]所创,转载请带上原文链接,感谢

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