Lists, Dicts & List Comprehensions
~20 min read
Python lists and comprehensions are the foundation of data manipulation in AI pipelines. Every tensor operation starts with understanding efficient sequence transformation.
Lists, Dicts & List Comprehensions is a Pro topic
Sign in, then upgrade to Pro or Power to unlock this topic and the full AI Engineering curriculum.
Key points
- •List comprehensions replace for-loops: [expr for item in list if condition]
- •NumPy arrays enable vectorized math — 100x faster than Python loops for numbers
- •Slicing: arr[1:4] gives elements 1, 2, 3; arr[::2] gives every other element
- •Dicts are O(1) lookup — use for vocabulary mappings and config objects