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Mar 26, 2025
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gh-131236: allow to generate multiple UUIDs at once via CLI #131218

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uuid: add --count to main
simon04 Mar 14, 2025
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"Generate NUM fresh UUIDs."
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Update Misc/NEWS.d/next/Library/2025-03-14-12-22-02.gh-issue-131236.H…
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Update Doc/library/uuid.rst
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Update Lib/uuid.py
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"UUID"
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uuid -C
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test_cli_uuid4_outputted_with_count
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Merge branch 'main' into uuid-count
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"UUID"
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ArgumentDefaultsHelpFormatter
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namespace
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namespace
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namespace
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6 changes: 6 additions & 0 deletions Doc/library/uuid.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -377,6 +377,10 @@ The following options are accepted:
The name used as part of generating the uuid. Only required for
:func:`uuid3` / :func:`uuid5` functions.

.. option:: --count <count>

Generate more uuids in loop.


.. _uuid-example:

Expand Down Expand Up @@ -445,3 +449,5 @@ Here are some examples of typical usage of the :mod:`uuid` command line interfac
# generate a uuid using uuid5
$ python -m uuid -u uuid5 -n @url -N example.com

# generate 42 random uuids
$ python -m uuid --count 42
8 changes: 6 additions & 2 deletions Lib/uuid.py
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Expand Up @@ -949,6 +949,8 @@ def main():
parser.add_argument("-N", "--name",
help="The name used as part of generating the uuid. "
"Only required for uuid3/uuid5 functions.")
parser.add_argument("--count", type=int, default=1,
help="Generate more uuids in loop. ")
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Suggested change
help="Generate more uuids in loop. ")
help="Generate COUNT UUIDs. Default: 1.")

Or add formatter_class=argparse.ArgumentDefaultsHelpFormatter to argparse.ArgumentParser() and:

Suggested change
help="Generate more uuids in loop. ")
help="Generate this many UUIDs.")

And also delete "By default uuid4 function is used."

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I would like to have a short option -C as well so to mimick uuidgen, and use NUM as a metavar instead of COUNT. In addition, we can just say Generate NUM fresh UUIDs

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And also delete "By default uuid4 function is used."

Isn't it the default though?

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Yes, but argparse.ArgumentDefaultsHelpFormatter prints the default for us:

❯ ./python.exe -m uuid -h
usage: python.exe -m uuid [-h]
                          [-u {uuid1,uuid3,uuid4,uuid5,uuid6,uuid7,uuid8}]
                          [-n NAMESPACE] [-N NAME] [--count COUNT]

Generates a uuid using the selected uuid function.

options:
  -h, --help            show this help message and exit
  -u, --uuid {uuid1,uuid3,uuid4,uuid5,uuid6,uuid7,uuid8}
                        The function to use to generate the uuid. By default
                        uuid4 function is used. (default: uuid4)
  -n, --namespace NAMESPACE
                        The namespace is a UUID, or '@ns' where 'ns' is a
                        well-known predefined UUID addressed by namespace
                        name. Such as @dns, @url, @oid, and @x500. Only
                        required for uuid3/uuid5 functions. (default: None)
  -N, --name NAME       The name used as part of generating the uuid. Only
                        required for uuid3/uuid5 functions. (default: None)
  --count COUNT         Generate more uuids in loop. (default: 1)

(I have an idea to add colour to those in future.)

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Oh. I thought that the suggestion was separate, my bad

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With ArgumentDefaultsHelpFormatter it would look the following:

It seems that the typesetting of the help text mixed – Do we start the help text with a capital letter? Do we use a period at the end (this looks strange with the (default: 1) generated by ArgumentDefaultsHelpFormatter)?

> python -m uuid -h
usage: python -m uuid [-h] [-u {uuid1,uuid3,uuid4,uuid5,uuid6,uuid7,uuid8}] [-n NAMESPACE] [-N NAME] [-C NUM]

Generates a uuid using the selected uuid function.

options:
  -h, --help            show this help message and exit
  -u, --uuid {uuid1,uuid3,uuid4,uuid5,uuid6,uuid7,uuid8}
                        The function to use to generate the uuid. (default: uuid4)
  -n, --namespace NAMESPACE
                        The namespace is a UUID, or '@ns' where 'ns' is a well-known predefined UUID addressed by namespace name. Such as @dns, @url, @oid, and @x500. Only required
                        for uuid3/uuid5 functions. (default: None)
  -N, --name NAME       The name used as part of generating the uuid. Only required for uuid3/uuid5 functions. (default: None)
  -C, --count NUM       Generate NUM fresh UUIDs. (default: 1)

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@simon04 simon04 Mar 14, 2025 •
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Adding ArgumentDefaultsHelpFormatter, going for lowercase first letter, removing period at the end, adding metavar="NS" for namespace yields a more compact and consistent help output:

> python -m uuid -h
usage: python -m uuid [-h] [-u {uuid1,uuid3,uuid4,uuid5,uuid6,uuid7,uuid8}] [-n NS] [-N NAME] [-C NUM]

Generate a UUID using the selected UUID function.

options:
  -h, --help            show this help message and exit
  -u, --uuid {uuid1,uuid3,uuid4,uuid5,uuid6,uuid7,uuid8}
                        function to generate the UUID (default: uuid4)
  -n, --namespace NS    a UUID, or '@ns' where 'ns' is a well-known predefined UUID addressed by namespace name, such as @dns, @url, @oid, and @x500 (only required for uuid3/uuid5)
                        (default: None)
  -N, --name NAME       name used as part of generating the UUID (only required for uuid3/uuid5) (default: None)
  -C, --count NUM       generate NUM fresh UUIDs (default: 1)

I'm still not happy with the verbose --namespace help, though:

  -n, --namespace NS    a UUID, or '@ns' where 'ns' is a well-known predefined UUID addressed by namespace name, such as @dns, @url, @oid, and @x500 (only required for uuid3/uuid5)
                        (default: None)

Is the following any better?

  -n, --namespace NS    a UUID, or @dns, @url, @oid, @x500, or any '@ns' where 'ns' is a well-known predefined UUID addressed by namespace name (only required for uuid3/uuid5)
                        (default: None)

Or specify the few choices explicitly?

  -n, --namespace {any UUID,@dns,@url,@oid,@x500}
                        a UUID, or a well-known predefined UUID addressed by namespace name (only required for uuid3/uuid5) (default: None)

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Adding ArgumentDefaultsHelpFormatter, going for lowercase first letter, removing period at the end, adding metavar="NS" for namespace yields a more compact and consistent help output:

👍

I'm still not happy with the very verbose "a UUID, or '@ns' where 'ns' is a well-known predefined UUID addressed by namespace name, such as @dns, @url, @oid, and @x500 (only required for uuid3/uuid5)", though. Is "a UUID, or @dns, @url, @oid, @x500, or any '@ns' where 'ns' is a well-known predefined UUID addressed by namespace name (only required for uuid3/uuid5)" any better?

It's a bit better, and I don't have a much better suggestion :)

I think we could also prefix and shorten the "(only required for uuid3/uuid5)" bits, so if you're not using uuid3/5 you can immediately skip it and save some mental effort:

  -n, --namespace NS    uuid3/uuid5 only: [etc]
                        (default: None)
  -N, --name NAME       uuid3/uuid5 only: name used as part of generating the UUID (default: None)

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For --namespace, maybe specify the few choices explicitly?

  -n, --namespace {any UUID,@dns,@url,@oid,@x500}
                        uuid3/uuid5 only: a UUID, or a well-known predefined UUID addressed by namespace name (default: None)

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Thanks for your ideas. Here's the concise result:

> python -m uuid -h
usage: python -m uuid [-h] [-u {uuid1,uuid3,uuid4,uuid5,uuid6,uuid7,uuid8}] [-n {any UUID,@dns,@url,@oid,@x500}] [-N NAME] [-C NUM]

Generate a UUID using the selected UUID function.

options:
  -h, --help            show this help message and exit
  -u, --uuid {uuid1,uuid3,uuid4,uuid5,uuid6,uuid7,uuid8}
                        function to generate the UUID (default: uuid4)
  -n, --namespace {any UUID,@dns,@url,@oid,@x500}
                        uuid3/uuid5 only: a UUID, or a well-known predefined UUID addressed by namespace name) (default: None)
  -N, --name NAME       uuid3/uuid5 only: name used as part of generating the UUID (default: None)
  -C, --count NUM       generate NUM fresh UUIDs (default: 1)


args = parser.parse_args()
uuid_func = uuid_funcs[args.uuid]
Expand All @@ -963,9 +965,11 @@ def main():
"Run 'python -m uuid -h' for more information."
)
namespace = namespaces[namespace] if namespace in namespaces else UUID(namespace)
print(uuid_func(namespace, name))
for _ in range(args.count):
print(uuid_func(namespace, name))
else:
print(uuid_func())
for _ in range(args.count):
print(uuid_func())


# The following standard UUIDs are for use with uuid3() or uuid5().
Expand Down
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