I'm trying to print a list or dict of file names into a text file. it's currently only returning the first item on the list. the items are fetched from s3 Aws.I'm using Python 2.6
for obj in bucket.objects.filter(Prefix=prefix):
s = obj.key
with open('test.txt', 'w') as f:
f.write(s)
The problem here is that for every item, you create a new file (in case the file already exists, you remove the content so to speak), and then write s to it.
So you should swap the order of things here:
with open('test.txt', 'w') as f: # first open the file
for obj in bucket.objects.filter(Prefix=prefix): # then iterate
f.write(obj.key)So we keep the file handle open, and each item will be written. A potential problem is that you will not write a new line after you written the key of an object. We can do this by writing a new line as well:
with open('test.txt', 'w') as f:
for obj in bucket.objects.filter(Prefix=prefix):
f.write(obj.key)
f.write('\n')
whenever you open a file for writing, the previous content is erased and new text is written. So in this case you are erasing whatever you wrote to the file in the next iteration. you can do it in this way or open the file in "append" mode and continue with what you have written.
f= open("test.txt", "w")
for obj in bucket.objects.filter(Prefix=prefix):
s = obj.key
f.write(s)
f.write('\n)
f.close()
test.txtand write that specific object to the file?