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Python Tutor is an online tool (pythontutor.com) and platform designed to help individuals learn and understand the Python programming language. It provides an interactive environment where users can write and execute Python code in their web browser while visualizing the execution of the code step by step. 

The primary feature of Python Tutor is its ability to create visualizations of code execution. Users can see how the variables change, the flow of control through loops and conditional statements, and the overall behavior of their code. This can be especially helpful for beginners who are trying to grasp the fundamentals of programming and understand how their code is executed. 

Python Tutor was created by Philip Guo, and it's available at pythontutor.com as an online tool. Additionally, there is a standalone version called "pythontutor.com" that users can download and run locally on their machines. The tool supports several programming languages, including Python, Java, JavaScript, TypeScript, Ruby, C, and C++. 

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