循环熊猫DF将新行添加到txt

Question

I have flat file (txt), in which I have Date column and Value column.

I am trying to append new lines to the txt in case my dataframe receives new lines, using a loop logic. I have this following code: LastDate I am saying here its equal to 0 for simplicity reasons.

LastDate = 0
saveFileLine = name+'.txt.'
saveFile = open(saveFileLine,'a')

for index, row in namedf.iterrows():
    if int(''.join(row['Date'].split('-')[:3])) > LastDate:
        lineToWrite = row+'\n'
        saveFile.write(lineToWrite)

saveFile.close()

and it gives me the error:

write() argument must be str, not Series

I dont know how to make it write the line of the loop currently active.

Hope you can help me out! Thanks

Answer 1

Each row is a Pandas Series. You're treating the whole row as a string. Do you want to write the whole row?

for index, row in namedf.iterrows():
    lineToWrite = row.to_string()
    saveFile.write(lineToWrite)