janisdd
commented
1 year ago Removing the last newline apparently makes things easier, see https://github.com/mholt/PapaParse/issues/150 which cites the csv standard https://www.rfc-editor.org/rfc/rfc4180 The last record in the file may or may not have an ending line break
An empty line could mean there are fields missing...
You can get the desired behavior when changing the vs code setting files.insertFinalNewline to true
What OS?
Description
A clear and concise description of what the bug is. when edit csv file,then saved.it will change the end char.delete the Newline character in windows. and then pd.concat to_csv mode="a".it is not has Newline character at the end.like down
csvData: A,B C,D no edit csv and concat mode= "a" get A,B C,D E,F if edit csv and concat mode = "a" get A,B, C,D,E,F It is wrong
Expected behavior
What you'd expect to happen. save as like DataFrame data and auto add \n in the end
csvData: A,B C,D edit csv and concat mode= "a" get A,B C,D E,F
Steps to reproduce
A step by step guide how to reproduce this issue/bug. pd.DataFrame(data=[newData],columns = keys)
A,B will_concat.append(newDataPd) pdConcat = pd.concat(will_concat,ignore_index=True) pdConcat.to_csv(fileName,encoding="utf-8",mode="a",header=hasKey,index=0) A,B C,D edit csv and save in Edit csv windows pd.read_csv(fileName, comment='#', encoding="utf-8") newDataPd = pd.DataFrame(data=[newData],columns = keys) will_concat.append(newDataPd) pdConcat = pd.concat(will_concat,ignore_index=True) pdConcat.to_csv(fileName,encoding="utf-8",mode="a",header=hasKey,index=0) now get A,B C,D,E,F It is Wrong