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The Slow Leak
A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.
- Domain
- Python
- Difficulty
- medium
- Seniority
- junior, mid
Problem
Our ingestion layer receives data from multiple upstream sources, each wrapped in its own iterator. Some sources nest iterators inside iterators. Write a function called flatten_iter that takes an iterator which may yield either values or other iterators, and returns a single flat list of all leaf values in order.
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