@ Introducing Python: Modern Computing in Simple Packages by Bill Lubanovic
(No. 3110 / 12833)
When you' re about to write some Python code, ...
on the verge of —usually used with be and a following infinitive
例: is about to join the army
上記で見かけた
on the verge of
on the verge of a major breakthrough
〔主語の〕大きな進展[発見]が直前に迫って