Why loop overwriting my file instead of writing after text?

Question

i = 1 # keep track of file number
directory = \'/some/directory/\'


for i in range(1, 5170): #number of files in directory
    filename = directory + \'D\' + str(i)         


        

Answer 1

Your issue is that you open in write mode. To append to file you want to use append. See here.