How to write to a CSV line by line?

Question

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 there\n') #Give your csv text here.
## Python will convert \n to os.linesep
f.close()

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)

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'.

To complement the previous answers, I whipped up a quick class to write to CSV files. It makes it easier to manage and close open files and achieve consistency and cleaner code if you have to deal 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, elems):
        self.writer.writerow(elems)

    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

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.