Separate data with a comma CSV Python

问题

I have some data that needs to be written to a CSV file. The data is as follows

A        ,B    ,C
a1,a2    ,b1   ,c1
a2,a4    ,b3   ,ct

The first column has comma inside it. The entire data is in a list that I'd like to write to a CSV file, delimited by commas and without disturbing the data in column A. How can I do that? Mentioning delimiter = ',' splits it into four columns on the whole.

回答1:

Just use the csv.writer from the csv module.

import csv

data =  [['A','B','C']
         ['a1,a2','b1','c1']
         ['a2,a4','b3','ct']]

fname = "myfile.csv"    
with open(fname,'wb') as f:
    writer = csv.writer(f)
    for row in data:
        writer.writerow(row)

https://docs.python.org/2/library/csv.html#csv.writer

回答2:

No need to use the csv module since the ',' in the first column is already part of your data, this will work:

with open('myfile.csv', 'w') as f:
    for row in data:
        f.write(', '.join(row))
        f.write('\n')

回答3:

You could try the below.

Code:

import csv
import re
with open('infile.csv', 'r') as f:
    lst = []
    for line in f:
        lst.append(re.findall(r',?(\S+)', line))
    with open('outfile.csv', 'w', newline='') as w:
        writer = csv.writer(w)
        for row in lst:
            writer.writerow(row)

Output:

A,B,C
"a1,a2",b1,c1
"a2,a4",b3,ct

来源：https://stackoverflow.com/questions/27098261/separate-data-with-a-comma-csv-python