Issue #12760: Refer to the new 'x' open mode as "exclusive creation" mode.
diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index 57cd9aa..a21aa7a 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -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"