Docker's engine is written in Go, not Python. The core components, dockerd, containerd, and runc, are all Go projects, and Go's lightweight goroutines are a big part of why Docker can manage many container processes at once without a heavy threading model. Containerd and runc were later donated to the Cloud Native Computing Foundation and now sit underneath other container runtimes too, including Kubernetes, which shows how much of the modern container ecosystem is built in Go rather than Python.
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