Python Tutor-Python code visualization tool.

Example

Visualize a simple loop that prints numbers 1 to 5.

Scenario

A beginner is learning loops in Python and writes a basic `for i in range(5): print(i)` loop. Running this in Python Tutor provides a step-by-step visualization, showing how the loop variable `i` is updated with each iteration, giving learners a clear view of the process behind the `for` loop’s operation. This helps break down the concept of iteration and variable change.

Example

Explore what happens when a syntax error or runtime error occurs in Python code.

Scenario

Suppose a user writes code with a common mistake, like forgetting a closing parenthesis in a `print()` statement. Python Tutor highlights where the error occurs and helps learners understand why the error happened, providing an immediate, visual response that reinforces debugging skills. By watching the code run, learners can observe where the error interrupts the normal flow of the program and what they should correct.

Example

Visualize the assignment and modification of lists, dictionaries, or other data structures.

Scenario

A student learning about lists creates a Python program where they append values to a list. Python Tutor shows how the list evolves after each operation, displaying the changes in a visual format. For instance, after `my_list = [1, 2, 3]` and then `my_list.append(4)`, the tool shows the updated list as `[1, 2, 3, 4]` at each step. This helps students understand how data is stored and manipulated within data structures.