Summary of Common Functions of UUID Module in Python

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UUID is usually used to generate unique identifiers, such as the ID field of the database, user account number, etc.

The following are some commonly used functions, for more information: https://docs.python.org/3/library/uuid.html.

uuid.uuid1(node=None, clock_seq=None)

Generate a UUID from a host ID, sequence number, and the current time. If node is not given, getnode() is used to obtain the hardware address. If clock_seq is given, it is used as the sequence number; otherwise a random 14-bit sequence number is chosen.

uuid.uuid3(namespace, name)

Generate a UUID based on the MD5 hash of a namespace identifier (which is a UUID) and a name (which is a bytes object or a string that will be encoded using UTF-8).

uuid.uuid4()

Generate a random UUID.

uuid.uuid5(namespace, name)

Generate a UUID based on the SHA-1 hash of a namespace identifier (which is a UUID) and a name (which is a bytes object or a string that will be encoded using UTF-8).

Note: You can also output uuid in different forms through hex, int, bytes and other attributes.

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import uuid

id_1 = uuid.uuid1()
print("uuid_1:" + str(id_1))
print("uuid_1.hex:" + str(id_1.hex))
print("uuid_1.int:" + str(id_1.int))
print("uuid_1.urn:" + str(id_1.urn))
print("uuid_1.bytes:" + str(id_1.bytes))
print("uuid_1.bytes_le:" + str(id_1.bytes_le) + "\n")

id_3 = uuid.uuid3(uuid.NAMESPACE_DNS, "example")
print("uuid_3:" + str(id_3) + "\n")

id_4 = uuid.uuid4()
print("uuid_4:" + str(id_4) + "\n")

id_5 = uuid.uuid5(uuid.NAMESPACE_DNS, "example")
print("uuid_5:" + str(id_5) + "\n")

The output is as follows:

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uuid_1:ea834337-38b2-11f0-aafd-d444ca5de201
uuid_1.hex:ea83433738b211f0aafdd444ca5de201
uuid_1.int:311720905198677193690942071098901914113
uuid_1.urn:urn:uuid:ea834337-38b2-11f0-aafd-d444ca5de201
uuid_1.bytes:b'\xea\x83C78\xb2\x11\xf0\xaa\xfd\xd4D\xca]\xe2\x01'
uuid_1.bytes_le:b'7C\x83\xea\xb28\xf0\x11\xaa\xfd\xd4D\xca]\xe2\x01'

uuid_3:c5e5f349-28ef-3f5a-98d6-0b32ee4d1743

uuid_4:6a10d447-9df6-4803-949d-1a4e23fccf40

uuid_5:7cb48787-6d91-5b9f-bc60-f30298ea5736