如何在Python中将多个文本文件合并为一个csv文件

Question

I am trying to convert 200 text files into csv files. I am using below code I am able to run it but it does not produce csv files. Could anyone tell any easy and fast way to do? Many Thanks

dirpath = 'C:\Files\Code\Analysis\Input\qobs_RR1\\'
output = 'C:\Files\Code\Analysis\output\qobs_CSV.csv'
csvout = pd.DataFrame()
files = os.listdir(dirpath)

for filename in files:
    data = pd.read_csv(filename, sep=':', index_col=0, header=None)
    csvout = csvout.append(data)

csvout.to_csv(output)

Answer 1

The problem is that your os.listdir gives you the list of filenames inside dirpath , not the full path to these files. You can get the full path by prepending the dirpath to filenames with os.path.join function.

import os
import pandas as pd

dirpath = 'C:\Files\Code\Analysis\Input\qobs_RR1\\'
output = 'C:\Files\Code\Analysis\output\qobs_CSV.csv'
csvout_lst = []
files = [os.path.join(dirpath, fname) for fname in os.listdir(dirpath)]

for filename in sorted(files):
    data = pd.read_csv(filename, sep=':', index_col=0, header=None)
    csvout_lst.append(data)

pd.concat(csvout_lst).to_csv(output)

Edit: this can be done with a one-liner:

pd.concat(
    pd.read_csv(os.path.join(dirpath, fname), sep=':', index_col=0, header=None)
    for fname in sorted(os.listdir(dirpath))
).to_csv(output)

Edit 2: updated the answer, so the list of files is sorted alphabetically.