Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
348 views
in Technique[技术] by (71.8m points)

python - Trailing delimiter confuses pandas read_csv

A csv (comma delimited) file, where lines have an extra trailing delimiter, seems to confuse pandas.read_csv. (The data file is [1])

It treats the extra delimiter as if there's an extra column. So there's one more column than what headers require. Then pandas.read_csv takes the first column as row labels. The overall effect is that columns and headers are not aligned any more - the first column becomes row labels, the second column is named by first header, etc.

It is quite annoying. Any idea how to tell pandas.read_csv do the right thing? I couldn't find one.

Great book, BTW.


[1]: 2012 FEC Election Database from chapter 9 of the book Python for Data Analysis

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

For everyone who is still finding this. Wes wrote a blogpost about this. The problem if there is one value too many in the row it is treated as the rows name.

This behaviour can be changed by setting index_col=False as an option to read_csv.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...