Python CSV Writer leave a empty line at the end of the file

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the following code leave a empty white line at the end of the txt file. how can i not have the writerows not terminate the last line?

        with open(fname, 'wb') as myFile:
        # Start the CSV Writer
        wr = csv.writer(myFile, delimiter=',', dialect='excel')
        wr.writerows(rows)

        # Close the file.
        myFile.close()

Firstly, since you are using with open as myFile you don't need myFile.close(), that is done automatically when you remove the indent.

Secondly, if you are willing to add another part to your program, you could simply write something that removes the last line. An example of this is made by Strawberry (altered slightly):

with open(fname) as myFile:
    lines = myFile.readlines()
with open(fname, "w") as myFile:
    myFile.writelines([item for item in lines[:-1]])

Note how the 'w' parameter will clear the file, so we need to open the file twice, once to read and once to write.

I also believe, you are able to use myFile.write, which doesn't add newlines. An example of using this would be:

with open(fname, 'wb') as myFile:
    wr = csv.writer(myFile, delimiter=',', dialect='excel')
    lines = []
    for items in rows:
        lines.append(','.join(items))
    wr.write('\n'.join(lines))

This however will only work if you have a multi-dimensional array, and should probably be avoided.

Csv writer writing blank line at the end of file - learnpython, Firstly, since you are using with open as myFile you don't need myFile.close() , that is done automatically when you remove the indent. Secondly, if you are  As part of optional paramaters for the csv.writer if you are getting extra blank lines you may have to change the lineterminator (info here). Example below adapated from the python page csv docs. Change it from ‘ ’ to whatever it should be. As this is just a stab in the dark at the problem this may or may not work, but it’s my best guess.

I appreciate that this is an old request but I stumbled across it whilst looking for the same solution. I ended up reading the answer in the csv documentation itself and found that csv.writer has a lineterminator formatting parameter which defaults to \r\n, giving the new rows we both didn't want.

As a solution I added the formatting parameter newline='' to the code and it works well (in situ below).

    with open(fname, 'wb') as myFile:
    # Start the CSV Writer
    wr = csv.writer(myFile, delimiter=',', dialect='excel', newline='')
    wr.writerows(rows)

    # Close the file.
    myFile.close()

Writing CSV adds blank lines between rows, r/learnpython · u/[deleted]188d. Csv writer writing blank line at the end of file. [​deleted]. Share10. 3. 10 Comments sorted byBest. Log in or sign up to leave a  the output file has a at the end of each line, and apparently one more at the end. When I bring it into Excel, I get blank lines between each row. The same if I open it with Notepad++. But, if I more if from a command line, the don't show up. I saw another Q&A about a at the end of a file - but this one is about a at the

I couldn't find an answer that will work in python 3 and also for my case so here is my solution:

def remove_last_line_from_csv(filename):
    with open(filename) as myFile:
        lines = myFile.readlines()
        last_line = lines[len(lines)-1]
        lines[len(lines)-1] = last_line.rstrip()
    with open(filename, 'w') as myFile:    
        myFile.writelines(lines)

Delete last (and blank) line from file written by CSV writer, In Python 3, leave the file in text mode, since you're writing text, but disable universal newlines. with open('/pythonwork/thefile_subset11.csv', 'w'  14.1. csv — CSV File Reading and Writing¶. The so-called CSV (Comma Separated Values) format is the most common import and export format for spreadsheets and databases. CSV format was used for many years prior to attempts to describe the format in a standardized way in RFC 41

14.1. csv — CSV File Reading and Writing, Delete last (and blank) line from file written by CSV writer - python-3.x. There is a single empty line at the end of the file that I need to remove. (And note - there is the left curving smart quote as well - that is u'\u201c'. mypath = 'C:\\csv\\'  In Python 3, leave the file in text mode, since you’re writing text, but disable universal newlines. with open ( '/pythonwork/thefile_subset11.csv' , 'w' , newline = " ) as outfile : writer = csv . writer ( outfile )

Avoiding empty line in writing process csv file, The csv module implements classes to read and write tabular data in CSV format. If csvfile is a file object, it should be opened with newline=''. The reader is hard-coded to recognise either '\r' or '\n' as end-of-line, and ignores lineterminator​. Error as e: sys.exit('file {}, line {}: {}'.format(filename, reader.line_num, e)). Read csv file line by line using csv module DictReader object With csv module’s DictReader class object we can iterate over the lines of a csv file as a dictionary i.e. for each row a dictionary is returned, which contains the pair of column names and cell values for that row.

Python CSV - Read and Write CSV Files in Python, Hallo, I have done some calculation on csv file. However, the output csv, after writing process added one empty line at the end of results. Writing to a CSV File. Let's now see how to go about writing data into a CSV file using the csv.writer function and the csv.Dictwriter class discussed at the beginning of this tutorial. Writing to a CSV File Using csv.writer. The code below writes the data defined to the example2.csv file.

Comments
  • You do realise there is no actual empty line added? Open the file for reading and do for line in myFile:print(repr(line)), you won't see any empty line.
  • Padraic, you're probably on an Unix system. In Unix there's no line added, in Windows there is. Seems inconsistent.
  • csv.writer has no write method, if the rows contained ints etc.. join would fail. The output will also be the same for all the examples if you just used the original code.