From a362c41bc934fabe6bfef9be1962005b38396860 Mon Sep 17 00:00:00 2001
From: Anders Kaseorg <andersk@mit.edu>
Date: Thu, 12 Sep 2024 06:54:18 -0700
Subject: [PATCH] gh-123968: Fix lower bound for `python -m random --float`
 (#123971)

---
 Lib/random.py                                               | 6 +++---
 Lib/test/test_random.py                                     | 4 ++--
 .../Library/2024-09-11-19-12-23.gh-issue-123968.OwHON_.rst  | 1 +
 3 files changed, 6 insertions(+), 5 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2024-09-11-19-12-23.gh-issue-123968.OwHON_.rst

diff --git a/Lib/random.py b/Lib/random.py
index f5a482b28de..8b9a270c429 100644
--- a/Lib/random.py
+++ b/Lib/random.py
@@ -1013,7 +1013,7 @@ def _parse_args(arg_list: list[str] | None):
         help="print a random integer between 1 and N inclusive")
     group.add_argument(
         "-f", "--float", type=float, metavar="N",
-        help="print a random floating-point number between 1 and N inclusive")
+        help="print a random floating-point number between 0 and N inclusive")
     group.add_argument(
         "--test", type=int, const=10_000, nargs="?",
         help=argparse.SUPPRESS)
@@ -1038,7 +1038,7 @@ def main(arg_list: list[str] | None = None) -> int | str:
         return randint(1, args.integer)
 
     if args.float is not None:
-        return uniform(1, args.float)
+        return uniform(0, args.float)
 
     if args.test:
         _test(args.test)
@@ -1055,7 +1055,7 @@ def main(arg_list: list[str] | None = None) -> int | str:
             try:
                 # Is it a float?
                 val = float(val)
-                return uniform(1, val)
+                return uniform(0, val)
             except ValueError:
                 # Split in case of space-separated string: "a b c"
                 return choice(val.split())
diff --git a/Lib/test/test_random.py b/Lib/test/test_random.py
index 9a44ab17686..51f9193b269 100644
--- a/Lib/test/test_random.py
+++ b/Lib/test/test_random.py
@@ -1433,8 +1433,8 @@ class CommandLineTest(unittest.TestCase):
             ("'a a' 'b b' 'c c'", "b b"),
             ("--integer 5", 4),
             ("5", 4),
-            ("--float 2.5", 2.266632777287572),
-            ("2.5", 2.266632777287572),
+            ("--float 2.5", 2.1110546288126204),
+            ("2.5", 2.1110546288126204),
         ]:
             random.seed(0)
             self.assertEqual(random.main(shlex.split(command)), expected)
diff --git a/Misc/NEWS.d/next/Library/2024-09-11-19-12-23.gh-issue-123968.OwHON_.rst b/Misc/NEWS.d/next/Library/2024-09-11-19-12-23.gh-issue-123968.OwHON_.rst
new file mode 100644
index 00000000000..4d4894716b7
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-09-11-19-12-23.gh-issue-123968.OwHON_.rst
@@ -0,0 +1 @@
+Fix the command-line interface for the :mod:`random` module to select floats between 0 and N, not 1 and N.