Question 1

How to connect PyCDP to a running Chrome instance?

Accepted Answer

Use the I/O mode's CDPConnection class with the WebSocket URL from Chrome's remote debugging port (e.g., ws://localhost:9222/devtools/...). The README provides a quick start example for navigating pages.

Question 2

PyCDP or Selenium for Python browser automation?

Accepted Answer

Choose PyCDP for low-level, type-safe control over Chrome via CDP with async support; opt for Selenium for higher-level, cross-browser automation with built-in actions and wider community tooling, but less protocol-specific precision.

Question 3

How to handle events like page loads in PyCDP?

Accepted Answer

In I/O mode, iterate over the connection's async event stream; for example, listen to page.LoadEventFired. In Sans-I/O mode, integrate with your own async loop to process event messages from the WebSocket.

Question 4

Does PyCDP work with headless Chrome?

Accepted Answer

Yes, it connects to any Chrome instance with DevTools Protocol enabled, including headless mode, by specifying the correct WebSocket URL, as shown in the examples for remote control.

Question 5

Can I use PyCDP with trio or asyncio?

Accepted Answer

Yes, Sans-I/O mode supports any async framework; there's even a dedicated trio-chrome-devtools-protocol library. I/O mode uses asyncio by default for WebSocket management.

Question 6

How to debug JavaScript execution with PyCDP?

Accepted Answer

Use the cdp.debugger domain wrappers to send commands like setBreakpoint and handle events, leveraging type safety for all debugger interactions, as mentioned in the API reference for domains.

PyCDP

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