Debugging a Jupyter Notebook cell

This can be … problematic. There is a known issue with debugging Jupyter Notebooks in VS Code that makes working with it very frustrating from time to time, as described here: microsoft/vscode#150219

If you want to debug a Jupyter Notebook cell, click the arrow next to the cell and select “Debug Cell”:

This arrow sometimes disappear. If that happens, click in the toolbar: View - > Command Palette… and type “Developer: Reload Window”. This will reload the VS Code window and the arrow should appear again. Otherwise, you can click Ctrl + Shift + Alt + Enter to start debugging a specific cell.

If this all works, you can debug notebooks in the same way as Python files, with breakpoints, stepping, inspecting variables, etc.

def compute_ratio(a, b):
    return a / b  # Put a breakpoint here, b can be 0

values = [1, 2, 3, 0, 4]
total = 0
for v in values:
    # Set a conditional breakpoint here with expression: v == 0
    total += compute_ratio(10, v)
total