Combine a folder of text files into a CSV with each content in a cell

Question

I have a folder containing several thousand .txt files. I\'d like to combine them in a big .csv according to the following model:

I found a R script suppose

Answer 1

The following python script works for me (where path_of_directory is replace by the path of the directory your files are in and output_file.csv is the path of the file you want to create/overwrite):

#! /usr/bin/python

import os
import csv

dirpath = 'path_of_directory'
output = 'output_file.csv'
with open(output, 'w') as outfile:
    csvout = csv.writer(outfile)
    csvout.writerow(['FileName', 'Content'])

    files = os.listdir(dirpath)

    for filename in files:
        with open(dirpath + '/' + filename) as afile:
            csvout.writerow([filename, afile.read()])
            afile.close()

    outfile.close()

Note that this assumes everything in the directory is a file.

Answer 2

Can be written slightly more compactly using pathlib.

>>> import os
>>> os.chdir('c:/scratch/folder to process')
>>> from pathlib import Path
>>> with open('big.csv', 'w') as out_file:
...     csv_out = csv.writer(out_file)
...     csv_out.writerow(['FileName', 'Content'])
...     for fileName in Path('.').glob('*.txt'):
...         csv_out.writerow([str(fileName),open(str(fileName.absolute())).read().strip()])

The items yielded by this glob provide access to both the full pathname and the filename, hence no need for concatenations.

EDIT: I've examined one of the text files and found that one of the characters that chokes processing looks like 'fi' but is actually these two characters together as a single character. Given the likely practical use to which this csv will be put I suggest the following processing, which ignores weird characters like that one. I strip out endlines because I suspect this makes csv processing more complicated, and a possible topic for another question.

import csv
from pathlib import Path

with open('big.csv', 'w', encoding='Latin-1') as out_file:
    csv_out = csv.writer(out_file)
    csv_out.writerow(['FileName', 'Content'])
    for fileName in Path('.').glob('*.txt'):
        lines = [ ]
        with open(str(fileName.absolute()),'rb') as one_text:
            for line in one_text.readlines():
                lines.append(line.decode(encoding='Latin-1',errors='ignore').strip())
        csv_out.writerow([str(fileName),' '.join(lines)])

Answer 3

If your txt files are not in table format, you might be better off using readLines(). This is one way to do it in base R:

setwd("~/your/file/path/to/txt_files_dir") 
txt_files <- list.files()
list_of_reads <- lapply(txt_files, readLines)
df_of_reads <- data.frame(file_name = txt_files, contents = do.call(rbind, list_of_reads))
write.csv(df_of_reads, "one_big_CSV.csv", row.names = F)