commit cf19cc3b920ca5995e1c202d2c3dd7a59ac8eac8
author Serhiy Storchaka <storchaka@gmail.com> Mon Jan 25 11:56:33 2021 +0200
committer GitHub <noreply@github.com> Mon Jan 25 11:56:33 2021 +0200
tree 114c6f03de6e732ca7b81bd60d48b1a7f7968b33
parent 8dfe15625e6ea4357a13fec7989a0e6ba2bf1359

bpo-27772: Make preceding width with 0 valid in string format. (GH-11270)

Previously it was an error with confusing error message.

Lib/test/test_unicode.py

diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index 4f5636e..df8f2c9 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -1098,6 +1098,12 @@ def __repr__(self):
         self.assertEqual('{0:^8s}'.format('result'), ' result ')
         self.assertEqual('{0:^9s}'.format('result'), ' result  ')
         self.assertEqual('{0:^10s}'.format('result'), '  result  ')
+        self.assertEqual('{0:8s}'.format('result'), 'result  ')
+        self.assertEqual('{0:0s}'.format('result'), 'result')
+        self.assertEqual('{0:08s}'.format('result'), 'result00')
+        self.assertEqual('{0:<08s}'.format('result'), 'result00')
+        self.assertEqual('{0:>08s}'.format('result'), '00result')
+        self.assertEqual('{0:^08s}'.format('result'), '0result0')
         self.assertEqual('{0:10000}'.format('a'), 'a' + ' ' * 9999)
         self.assertEqual('{0:10000}'.format(''), ' ' * 10000)
         self.assertEqual('{0:10000000}'.format(''), ' ' * 10000000)