Open, Write, and Append a Text file

I've run into a bit of a snag with a python script that I was hoping anyone with a fresh pair of eyes and a bit more expertise than myself could spot. I compile, build, and execute the code in Geany if that matters at all. I am getting an error back suggesting a "ValueError I/O operation on closed file". line 8 specifically the f.write("Appended line %d r\n % (i+1))"

def main (_):      """ Function doc """        f=  open("AlltheRocks.txt", "a+")    for i in range(2):            f.write("Appended   line    %d\r\n" %   (i+1))            f.close()        if __name__==   "__main__":      main()  

If any help could be pointed out that would be amazing. I am ultimately trying to see if I can write a single program that opens, writes, and appends multiple text files from potentially different websites as well is that possible?

https://stackoverflow.com/questions/65589214/open-write-and-append-a-text-file January 06, 2021 at 10:04AM