Mercurial > cpython-lru_cache-weakref

diff Python/pystrtod.c @ 53802:1d8f24d40c2c legacy-trunk

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Issue #5920: Changed format.__float__ and complex.__float__ to use a precision of 12 when using the empty presentation type. This more closely matches str()'s behavior and reduces surprises when adding alignment flags to an empty format string. Patch by Mark Dickinson.
author Eric Smith <eric@trueblade.com>
date Tue, 05 May 2009 18:26:08 +0000
parents 4f867f1494d5
children 38fda3a42c0b
line wrap: on
line diff
--- a/Python/pystrtod.c	Tue May 05 17:41:47 2009 +0000
+++ b/Python/pystrtod.c	Tue May 05 18:26:08 2009 +0000
@@ -660,16 +660,15 @@
 		/* Supplied precision is unused, must be 0. */
 		if (precision != 0)
 			return;
+		/* The repr() precision (17 significant decimal digits) is the
+		   minimal number that is guaranteed to have enough precision
+		   so that if the number is read back in the exact same binary
+		   value is recreated.  This is true for IEEE floating point
+		   by design, and also happens to work for all other modern
+		   hardware. */
 		precision = 17;
 		format_code = 'g';
 		break;
-	case 's':          /* str format */
-		/* Supplied precision is unused, must be 0. */
-		if (precision != 0)
-			return;
-		precision = 12;
-		format_code = 'g';
-		break;
 	default:
 		assert(0);
 		return;