[bad_user]

The Google Search engine was at some point written in Python.

[pragmatic]

The crawler was in Python, not the search engine itself.

http://infolab.stanford.edu/~backrub/google.html

Both the URLserver and the crawlers are implemented in Python.

[icey]

Do you have a source for this? I'd love to read more about it; I knew they had python in use in some places, but this is the first I've heard that it was used in their search engine.