From c3e40f8c5bc7eb1c6aa60074c729219ce8881276 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Tue, 18 Oct 2016 17:42:48 +0200
Subject: timeit: add nsec (nanosecond) unit for format timings

Issue #28240.
---
 Doc/library/timeit.rst  | 2 +-
 Lib/test/test_timeit.py | 2 +-
 Lib/timeit.py           | 6 +++---
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/Doc/library/timeit.rst b/Doc/library/timeit.rst
index bad7194..5cb174c 100644
--- a/Doc/library/timeit.rst
+++ b/Doc/library/timeit.rst
@@ -224,7 +224,7 @@ Where the following options are understood:
 
 .. cmdoption:: -u, --unit=U
 
-    specify a time unit for timer output; can select usec, msec, or sec
+    specify a time unit for timer output; can select nsec, usec, msec, or sec
 
    .. versionadded:: 3.5
 
diff --git a/Lib/test/test_timeit.py b/Lib/test/test_timeit.py
index b297222..4e8c118 100644
--- a/Lib/test/test_timeit.py
+++ b/Lib/test/test_timeit.py
@@ -331,7 +331,7 @@ class TestTimeit(unittest.TestCase):
             invalid = self.run_main(seconds_per_increment=0.002,
                     switches=['-u', 'parsec'])
         self.assertEqual(error_stringio.getvalue(),
-                    "Unrecognized unit. Please select usec, msec, or sec.\n")
+                    "Unrecognized unit. Please select nsec, usec, msec, or sec.\n")
 
     def test_main_exception(self):
         with captured_stderr() as error_stringio:
diff --git a/Lib/timeit.py b/Lib/timeit.py
index 8bc6a9e..23bdd02 100644
--- a/Lib/timeit.py
+++ b/Lib/timeit.py
@@ -18,7 +18,7 @@ Options:
                 Execution time of this setup statement is NOT timed.
   -p/--process: use time.process_time() (default is time.perf_counter())
   -v/--verbose: print raw timing results; repeat for more digits precision
-  -u/--unit: set the output time unit (usec, msec, or sec)
+  -u/--unit: set the output time unit (nsec, usec, msec, or sec)
   -h/--help: print this usage message and exit
   --: separate options from statement, use when statement starts with -
   statement: statement to be timed (default 'pass')
@@ -272,7 +272,7 @@ def main(args=None, *, _wrap_timer=None):
     repeat = default_repeat
     verbose = 0
     time_unit = None
-    units = {"usec": 1e-6, "msec": 1e-3, "sec": 1.0}
+    units = {"nsec": 1e-9, "usec": 1e-6, "msec": 1e-3, "sec": 1.0}
     precision = 3
     for o, a in opts:
         if o in ("-n", "--number"):
@@ -283,7 +283,7 @@ def main(args=None, *, _wrap_timer=None):
             if a in units:
                 time_unit = a
             else:
-                print("Unrecognized unit. Please select usec, msec, or sec.",
+                print("Unrecognized unit. Please select nsec, usec, msec, or sec.",
                     file=sys.stderr)
                 return 2
         if o in ("-r", "--repeat"):
-- 
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