Cast and control it from your own script

pychromecast relies on mDNS, so the README's own network requirements matter before anything else: multicast UDP must be forwarded by your Wi-Fi router, the machine running the script must allow inbound and outbound traffic on port 5353, and it must sit on the same subnet as the Chromecast, since mDNS packets are not routed across subnets. When any of that is not possible, the README's fallback is to pass known IP addresses straight to the discovery functions instead of relying on mDNS.

1. Install the library from PyPI with pip install PyChromecast, per its own PyPI listing; the project's README lists requests, protobuf and zeroconf as its dependencies.
2. Call get_listed_chromecasts() with the device's friendly name to find and connect to it, as shown in the same README's quick start.
3. Call cast.wait() to wait for it to be ready, then send a video URL or control playback and volume through its media controller, per the same README.
4. If a media center device nearby misbehaves over CEC, add it to pychromecast's IGNORE_CEC list, as documented in the same README.

Nothing is flashed on the device. The worst case the README describes is a CEC incompatibility with another media center device, worked around with IGNORE_CEC rather than fixed on the Chromecast itself. Undo is closing the script and casting from the official app exactly as before.