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Python Programming Learning Circle

Aug 27, 2024 · Fundamentals

Understanding pandas loc/iloc Performance and Faster Alternatives with at/iat

This article explains how pandas loc and iloc work, demonstrates their slow performance when used inside loops, and shows that using the at and iat accessors provides a dramatically faster alternative for scalar assignments in DataFrames.

atiatiloc

0 likes · 5 min read

Understanding pandas loc/iloc Performance and Faster Alternatives with at/iat

Python Programming Learning Circle

Aug 21, 2024 · Fundamentals

Why Using loc/iloc in Loops Is Slow and How at/iat Provides Faster Alternatives in Pandas

This article explains why pandas loc/iloc operations inside Python loops are extremely slow, demonstrates the performance difference with concrete examples, and shows that using the scalar‑access methods at and iat can speed up the same task by dozens of times.

atiatiloc

0 likes · 5 min read

Why Using loc/iloc in Loops Is Slow and How at/iat Provides Faster Alternatives in Pandas