Add create mode to open()

Modules/_io/fileio.c

--- a/Modules/_io/fileio.c	Wed Jan 11 21:00:48 2012 -0500
+++ b/Modules/_io/fileio.c	Thu Jan 12 07:35:13 2012 +0200
@@ -1066,9 +1066,9 @@
 "file(name: str[, mode: str][, opener: None]) -> file IO object\n"
 "\n"
 "Open a file.  The mode can be 'r', 'w', 'x' or 'a' for reading (default),\n"
-"writing, creating or appending.  The file will be created if it doesn't\n"
-"exist when opened for writing or appending; it will be truncated when\n"
-"opened for writing.  A `FileExistsError` will be raised if it already\n"
+"writing, exclusive creation or appending.  The file will be created if it\n"
+"doesn't exist when opened for writing or appending; it will be truncated\n"
+"when opened for writing.  A `FileExistsError` will be raised if it already\n"
 "exists when opened for creating. Opening a file for creating implies\n"
 "writing so this mode behaves in a similar way to 'w'.Add a '+' to the mode\n"
 "to allow simultaneous reading and writing. A custom opener can be used by\n"