This is a Python script that will download your entire Bandcamp collection to your working directory. For albums, it downloads ZIP files, and for tracks, it downloads the track.
It downloads items in FLAC format by default. Use --format to change the format; known format identifiers are:
aac-hi
aiff-lossless
alac
flac
mp3-320
mp3-v0
vorbis
wav
If you have browser-cookie3 the script will attempt to pull your bandcamp.com identity cookie and username from Firefox or Chrome.
If this doesn't work for you, provide the value of your identity cookie as a raw or Base64 string to --identity.
browser-cookie3 exceptions are visible with -v/--verbose.
This script only downloads items you've purchased. Because this uses undocumented and unsupported APIs, it may break at any time. The author will not provide support for this script.