我想在每行中使用 2 个逗号

Question

I want to get between 2 commas in each line. My example data.txt like this:

"",ID SURNAME NAME,1st Midterm
1,9002131225 name1 surname1,90
2,9034623973 name2 surname2,80
3,9082135314 name3 surname3,50

Example output.txt :

9002131225 name1 surname1
9034623973 name2 surname2
9082135314 name3 surname3

how can I do that in python? thanks.

Answer 1

The data format as shown in the example is csv with values ID SURNAME NAME belonging to one column. If you are ok with extra dependency on pandas, then you can:

import pandas as pd
pd.read_csv("data.txt")['ID SURNAME NAME'].to_csv(
    "output.txt", index=False, header=None)

Or using just string manipulation

with open("data.txt") as fp:
  txt = fp.read()

with open('output.txt', 'w') as f:
  _ = [f.write(x.split(",")[1]+"\n") for x in txt.split("\n")[1:]]

Answer 2

You can use split(',') in python3 without using any library:

string = "1,9002131225 name1 surname1,90"
data = string.split(',')
print(data[1])

output:

9002131225 name1 surname1

Answer 3

Read about loops and string manipulation, these are Python basics.

A combination of for loop and split() you can do the following:

with open('data.txt') as f:
    for line in f:
       print(s.split(",")[1])

You should attempt to write code and ask for feedback when you're stuck.

Answer 4

With python capability to read the Input_file, could you please try following, written and tested in Python3. Python program name is scr.py , file from where input is being read is Input_file and program will write output to outputFile .

cat scr.py
#!/usr/bin/python3
with open('outputFile', 'w') as f_out, open('Input_file') as f_in:
    for line in f_in:
        new_str = "".join(line.split(',')[1:-1])
        f_out.write(new_str + '\n')
    f_out.close()