We begin by using pip3 to actually install WAL-E using Python version 3. WAL-E was recently modified to remove Python 2 compatibility, so we must use this approach to complete the install.
While each cloud service has its own necessary driver, we don't need to install all of them. The appropriate driver should be described in the WAL-E requirements, but a failed attempted transmission will also tell us which one we need if it isn't already installed. If we were missing the necessary driver, we would receive an error like this:
In the case of the boto driver for Amazon S3, there was a bug in the installer when we wrote this ...
