from uuid import UUID
[docs]def validate_uuid4(uuid_string):
"""
Validate that a UUID string is in
fact a valid uuid4.
Happily, the uuid module does the actual
checking for us.
It is vital that the 'version' kwarg be passed
to the UUID() call, otherwise any 32-character
hex string is considered valid.
"""
try:
val = UUID(uuid_string, version=4)
suuid = uuid_string.replace('-', '')
except ValueError:
# If it's a value error, then the string
# is not a valid hex code for a UUID.
return False
# If the uuid_string is a valid hex code,
# but an invalid uuid4,
# the UUID.__init__ will convert it to a
# valid uuid4. This is bad for validation purposes.
return val.hex == suuid