(Merge 3.3) Issue #18137: Detect integer overflow on precision in

float.__format__() and complex.__format__().

diff --cc Lib/test/test_format.py
Simple merge

diff --cc Misc/NEWS
index 7ef9154e63a846dc6cd1df898e25ac215b004e8d,04b5e41ad6efd351d1431ef401a0de6b5f6eacfa..d595287f32aa59cbaa5f875450ce85ca71a8b119
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,9 -12,9 +10,12 @@@ What's New in Python 3.4.0 Alpha 1
  Core and Builtins
  -----------------
  
+ - Issue #18137: Detect integer overflow on precision in float.__format__()
+   and complex.__format__().
+ 
 +- Issue #15767: Introduce ModuleNotFoundError which is raised when a module
 +  could not be found.
 +
  - Issue #18183: Fix various unicode operations on strings with large unicode
    codepoints.
  

diff --cc Python/formatter_unicode.c
Simple merge