Using df.loc[i, 'a'] in a loop assumes the DataFrame index matches positional integers, but since pandas uses labels (not positions) for indexing, this can cause silent data selection errors when indexes are shuffled; always prefer vectorized operations or use .iloc for positional access.
安装我们的扩展，即时搜索任意视频内容
Your Python Is Too Slow: Why your Pandas loop is slower AND wrong!本站添加:
Why your pandas loop is slower and wrong.
Let's look at the bug. Here is the buggy code. Look carefully. The bug is subtle.
Using df.loc i in a loop assumes data frame index matches positional integers, but indexes might be shuffled causing wrong data selection. Python pandas uses labels in loc, not positions. So integer looping can break alignment silently.
Here is the correct fix. Subscribe before your next pandas bug.
相关推荐
Re: 🗣️📍theprophedu📍2026 GST 103 CLASS (E-EXAM REVISION)
theprophedu
636 views•2026-06-04
WEB TECHNOLOGIES UNIT-2 | Degree 4th sem BCOM Computers web technologies unit-2 full explanation💯✅
LearnwithSahera
1K views•2026-05-29
More tests are always better? How to use AI to identify tests that bring little value
Alliance4Qualification
335 views•2026-05-29
Search Algorithms Explained in 60 Seconds! 🤖💨
samarthtuliofficial
218 views•2026-06-01
Making Minecraft Clone with C++ & Raylib
PecaCSLive
686 views•2026-06-04
People of Game of Thrones using JavaScript DOM
AltCampus
296 views•2026-05-30
Instagram accounts got PWNed
EricParker
13K views•2026-06-03
Introduction to Problem Solving Part - 1 | Lecture 1 | Intermediate DSA
ascensionix
107 views•2026-05-29
热门趋势
Why Batman Lets The Joker Live 🤨
zackdfilms
9222K views•2026-05-30
They're Complete Trash
penguinz0
558K views•2026-06-04
The Murder of Deputy Caleb Conley
MidwestSafety
810K views•2026-06-04
I Bought FAKE HopeScope Merch (and paid a subscriber to give it a makeover) | Hopeful Hauls
HangWithHopescope
158K views•2026-06-04