How to write to a CSV line by line?

Question

I have data which is being accessed via http request and is sent back by the server in a comma separated format, I have the following code :

site= 'www.example.com'
hdr = {'User-Agent': 'Mozilla/5.0'}
req = urllib2.Request(site,headers=hdr)
page = urllib2.urlopen(req)
soup = BeautifulSoup(page)
soup = soup.get_text()
text=str(soup)

The content of text is as follows:

april,2,5,7
may,3,5,8
june,4,7,3
july,5,6,9

How can I save this data into a CSV file.
I know I can do something along the lines of the following to iterate line by line:

import StringIO
s = StringIO.StringIO(text)
for line in s:

But i’m unsure how to now properly write each line to CSV

EDIT—> Thanks for the feedback as suggested the solution was rather simple and can be seen below.

Solution:

import StringIO
s = StringIO.StringIO(text)
with open('fileName.csv', 'w') as f:
    for line in s:
        f.write(line)

Asked By: Mustard Tiger

||

Source

Answer 1

I would simply write each line to a file, since it’s already in a CSV format:

write_file = "output.csv"
with open(write_file, "wt", encoding="utf-8") as output:
    for line in text:
        output.write(line + 'n')

I can’t recall how to write lines with line-breaks at the moment, though :p

Also, you might like to take a look at this answer about write(), writelines(), and 'n'.

Answered By: icedwater

Answer 2

You could just write to the file as you would write any normal file.

with open('csvfile.csv','wb') as file:
    for l in text:
        file.write(l)
        file.write('n')

If just in case, it is a list of lists, you could directly use built-in csv module

import csv

with open("csvfile.csv", "wb") as file:
    writer = csv.writer(file)
    writer.writerows(text)

Answered By: Vishwa

Answer 3

General way:

##text=List of strings to be written to file
with open('csvfile.csv','wb') as file:
    for line in text:
        file.write(line)
        file.write('n')

OR

Using CSV writer :

import csv
with open(<path to output_csv>, "wb") as csv_file:
        writer = csv.writer(csv_file, delimiter=',')
        for line in data:
            writer.writerow(line)

OR

Simplest way:

f = open('csvfile.csv','w')
f.write('hi theren') #Give your csv text here.
## Python will convert n to os.linesep
f.close()

Answered By: Ani Menon

Answer 4

What about this:

with open("your_csv_file.csv", "w") as f:
    f.write("n".join(text))

str.join() Return a string which is the concatenation of the strings in iterable.
The separator between elements is
the string providing this method.

Answered By: Vlad Bezden

Answer 5

In addition to the previous answers, I created a class for quickly writing to CSV files. This approach simplifies the management and closure of open files, as well as ensures consistency and cleaner code, especially when dealing with multiple files.

class CSVWriter():

    filename = None
    fp = None
    writer = None

    def __init__(self, filename):
        self.filename = filename
        self.fp = open(self.filename, 'w', encoding='utf8')
        self.writer = csv.writer(self.fp, delimiter=';', quotechar='"', quoting=csv.QUOTE_ALL, lineterminator='n')

    def close(self):
        self.fp.close()

    def write(self, *args):
        self.writer.writerow(args)

    def size(self):
        return os.path.getsize(self.filename)

    def fname(self):
        return self.filename

Example usage:

mycsv = CSVWriter('/tmp/test.csv')
mycsv.write(12,'green','apples')
mycsv.write(7,'yellow','bananas')
mycsv.close()
print("Written %d bytes to %s" % (mycsv.size(), mycsv.fname()))

Have fun

Answered By: jrm

Answer 6

In my situation…

  with open('UPRN.csv', 'w', newline='') as out_file:
    writer = csv.writer(out_file)
    writer.writerow(('Name', 'UPRN','ADMIN_AREA','TOWN','STREET','NAME_NUMBER'))
    writer.writerows(lines)

you need to include the newline option in the open attribute and it will work

https://www.programiz.com/python-programming/writing-csv-files

Answered By: Geographos

How to write to a CSV line by line?

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