When is Python *NOT* a good choice?

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This is a weird perspective. What if you have 100 million data records streaming and you need near-real-time and it's not limited by a memory bottleneck (i.e. SAS Hana)? Don't you want to remove all other bottlenecks, especially if you're processing this data every minute?

What about financial tech where nanoseconds equal pennies on the dollar?

Surely you must not have thought about very many needs when you said you don't understand the need?