Pythontutor

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The website pythontutor.com allows you to see a code running line by line. Despite its name, pythontutor also works for Java, C++, JS and others !

Go on this page, write your code, select the Python 3.6 version and click on Visualize execution.

Then click multiple times on Forward so that the programs runs one line at a time.

You'll see the print of the programs in the frame Print output.

You see the state of the memory at the right side of the screen below the text Frames.