My S3 bucket contains a bunch of files in a multilevel folder structure. I’m trying to identify the top level folders in the hierarchy, but objects.all()
returns some but not all folders as distinct ObjectSummary
objects. Why?
Sample file structure:
file1.txt a/file2.txt a/a1/file3.txt b/b1/file4.txt
Desired output: [a,b]
What I’m doing:
boto3.resource('s3').Bucket('mybucket').objects.all()
This returns the following ObjectSummary
objects:
file1.txt a/ a/file2.txt a/a1/file3.txt b/b1/file4.txt
Notice that a/
is listed as a separate entry, but b/
is not, while the files in b/
are.
I could understand it returning neither, as folders are technically not distinct entities, or both, but why are some folders returned and others not?
I also understand there could be other ways to achieve my objective, but I want to understand why boto3 is behaving this way.
Advertisement
Answer
S3 does have the concept of creating a folder, through a Create Folder button, which creates a dedicated object with just the folder name, separate from the files that have this as a prefix.
a/
in the example above was a folder I created manually, but I hadn’t done this for b/
.