>>> import base64, binascii, uuid
>>>
>>> def encode(uid: uuid.UUID) -> str:
...     return base64.urlsafe_b64encode(uid.bytes).decode().rstrip("=")
...
>>> def decode(uid: str) -> uuid.UUID:
...     return uuid.UUID(binascii.b2a_hex(base64.urlsafe_b64decode(uid_b64 + "==")).decode())
...
>>> uid = uuid.UUID("12546fd8-6dd9-4923-9c0a-f1fefadd3e2b")
>>> uid
UUID('12546fd8-6dd9-4923-9c0a-f1fefadd3e2b')
>>> uid_b64 = encode(uid)
>>> uid_b64
'ElRv2G3ZSSOcCvH--t0-Kw'
>>> decode(uid_b64)
UUID('12546fd8-6dd9-4923-9c0a-f1fefadd3e2b')