[pypy-commit] pypy default: Presize the StringBuilder to the length of the input string, which is the minimum length for the output

[alex_gaynor]

Author: Alex Gaynor <alex.gay...@gmail.com>
Branch: 
Changeset: r73186:e435043d0dbe
Date: 2014-08-29 11:23 -0700
http://bitbucket.org/pypy/pypy/changeset/e435043d0dbe/

Log:    Presize the StringBuilder to the length of the input string, which
        is the minimum length for the output

diff --git a/pypy/module/_pypyjson/interp_encoder.py 
b/pypy/module/_pypyjson/interp_encoder.py
--- a/pypy/module/_pypyjson/interp_encoder.py
+++ b/pypy/module/_pypyjson/interp_encoder.py
@@ -29,7 +29,7 @@
         w_string = space.call_method(w_string, 'decode', space.wrap('utf-8'))
 
     u = space.unicode_w(w_string)
-    sb = StringBuilder()
+    sb = StringBuilder(len(u))
     for c in u:
         if c <= u'~':
             if c == u'"' or c == u'\\':
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