Python | 分隔文本文件为csv格式

Question

I'm new to python but I'm having trouble reading a text file which contains data separated by "|" as the delimiter. How would I separate the file into columns in a CSV format.

import csv
my_file_name = "NVG.txt"
cleaned_file = "cleanNVG.csv"

with open(my_file_name, 'r') as infile, open(cleaned_file, 'w') as outfile:
    data = infile.read()

    data = data.replace("|","")
    outfile.write(data)

This code gets rid of the | to a blank but all the data is just in one column now. How can I format this correctly? I appreciate your help in advance.

Answer 1

The csv module allows you to read csv files with practically arbitrary delimiters.

with open(my_file_name, 'r', newline='') as infile:
    for line in csv.reader(infile, delimiter='|'):
        # do stuff

If you really want to reformat the file, you can use the csv.writer directly:

with open(my_file_name, 'r', newline='') as infile, open(cleaned_file, 'w', newline='') as outfile:
    writer = csv.writer(outfile)
    for line in csv.reader(infile, delimiter='|'):
        writer.writerow(line)

---

Note that your approach doesn't work because you remove the separator instead of replacing it. data.replace("|","") will replace each | with the empty string, ie "foo|bar" becomes "foobar" . You must replace the old separator with a new one, eg data.replace("|", ",") .

Answer 2

The simplest way with your code would be to replace "|" with "," rather than removing "|"

data = data.replace("|", ",")

Answer 3

You're importing the csv module, but aren't using it. Make use of csv.reader

with open(my_file_name, 'r') as infile, open(cleaned_file, 'w') as outfile:
    reader = csv.reader(infile, delimiter='|')