With Python3, open the file in w mode: with open(‘returns.csv’, ‘w’) as f: writer = csv.writer(f) for val in daily_returns: writer.writerow([val]) With Python2.6+, open the file in wb mode: with open(‘returns.csv’, ‘wb’) as f: writer = csv.writer(f) for val in daily_returns: writer.writerow([val])
There are minor differences between append() and write(). All of which you can work out by reading the Javadocs. Hint. 😉 write will only take a String which must not be null and returns void append will take any CharSequence which can be null and return the Writer so it can be chained. write is … Read more
My suggestion is, why dont you write your OutputStream then?! I was about to write one for you, but I found this good example on the net, check it out! LogOutputStream.java /* * Jacareto Copyright (c) 2002-2005 * Applied Computer Science Research Group, Darmstadt University of * Technology, Institute of Mathematics & Computer Science, * … Read more
As soon as you leave the using block’s scope, the stream is closed and disposed. The Close() calls the Flush(), so you should not need to call it manually.
Yes, your conclusion is correct subclasses of Reader and Writer are for reading/writing text content. InputStream / OutputStream are for binary content. If you take a look at the documentation: Reader – Abstract class for reading character streams InputStream – Abstract class is the superclass of all classes representing an input stream of bytes.
You can give your writer instance a custom lineterminator argument in the constructor: writer = csv.writer(f, lineterminator=”\n”)
You can’t write into a string, strings in Go are immutable. The best alternatives are the bytes.Buffer and since Go 1.10 the faster strings.Builder types: they implement io.Writer so you can write into them, and you can obtain their content as a string with Buffer.String() and Builder.String(), or as a byte slice with Buffer.Bytes(). You … Read more
Assuming all the streams get created okay, yes, just closing bw is fine with those stream implementations; but that’s a big assumption. I’d use try-with-resources (tutorial) so that any issues constructing the subsequent streams that throw exceptions don’t leave the previous streams hanging, and so you don’t have to rely on the stream implementation having … Read more
with open(‘document.csv’,’a’) as fd: fd.write(myCsvRow) Opening a file with the ‘a’ parameter allows you to append to the end of the file instead of simply overwriting the existing content. Try that.