Boto3 download files from a prefix

Now that we have our keys setup we will talk about how to upload a file using Boto3 S3. We will start by uploading a local file to our S3 bucket. The code we will be writing and executing will leverage the boto3 helper python code we wrote above. The steps to accomplish this are the following:.

One thing to note here is that we are uploading 2 files test. This assumes you have created the files locally if not you can use the ones from the git repo and you need to have created a bucket as it was shown earlier called unbiased-coder-bucket.

If you choose a different name just replace the code above accordingly with the bucket name you chose to use. If we were to execute the code above you would see it in the output:. This shows that we successfully uploaded two files in our S3 bucket in AWS. To verify that everything worked for now we can login to the AWS console and see if the files are there. Later in the article we will demonstrate how to do this programmatically. If you were to login to the AWS console you will see something like this:.

In the above scenario basically the file will be uploaded into the prefix-dir from the root of our unbiased-coder-bucket. In this section we will go over on how to download a file using Boto3 S3, similar to uploading a file to S3 we will implement the download functionality:. The code above will download from our bucket the previously two files we uploaded to it.

The answer is no because the last argument of the download file is the destination path. Lets demonstrate the execution of this example:. Next we will discuss on how to list files using Boto3 S3 from our bucket. This is particularly useful when scripting code as a batch job that runs periodically and also acts as a verification that your data is there when it should be.

In the instance above we are not applying any filters on the objects we are requesting but we can easily do that if we wanted too. For example lets say we had a folder in our bucket called sub-folder and wanted to list all the items in it we would be adjusting the code to look like this:. In our case since we do not have a sub-folder directory it will not return any results if we were to execute the new code.

One common question that I always get is:. However you can always request all the files in a directory and then using python you can check the extension of the file and see if it matches what you are looking for.

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