The Virtues of Being Lazy
summary
Describes a concrete claim: Python 3.15 adds a lazy keyword that defers module imports to first use and measurably cuts startup time and memory. Live demo shows importing pandas taking about 7 seconds on an older i7 and then becoming instant when unused under lazy imports. Details: lazy is a soft keyword, thread safe, works with from but not star imports, does not cascade and is resolved at access, can be forced with resolve and moves ModuleNotFoundError to use time.
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chapters (10)
- 0:00Lazy programming intro
- 1:08Three virtues of lazy
- 2:55Live coding self-documenting
- 8:32Python 2 vs 3 lazy eval
- 12:51Startup latency with lazy imports
- 17:33Python 3.15 lazy keyword
- 21:21Soft keywords and mechanics
- 24:58Lazy imports pitfalls & benefits
- 27:15Summary of lazy techniques
- 29:01Closing remarks
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