bpo-37321: Edit IDLE subprocess connection error messages. (#14170)

Mainly, add a doc reference to message in pyshell.

1 files changed, 7 insertions, 5 deletions

diff --git a/Lib/idlelib/run.py b/Lib/idlelib/run.py
index 4075deec51..6b3928b7bf 100644
--- a/Lib/idlelib/run.py
+++ b/Lib/idlelib/run.py
@@ -199,11 +199,13 @@ def show_socket_error(err, address):
     root = tkinter.Tk()
     fix_scaling(root)
     root.withdraw()
-    msg = f"IDLE's subprocess can't connect to {address[0]}:{address[1]}.\n"\
-          f"Fatal OSError #{err.errno}: {err.strerror}.\n"\
-          f"See the 'Startup failure' section of the IDLE doc, online at\n"\
-          f"https://docs.python.org/3/library/idle.html#startup-failure"
-    showerror("IDLE Subprocess Error", msg, parent=root)
+    showerror(
+            "Subprocess Connection Error",
+            f"IDLE's subprocess can't connect to {address[0]}:{address[1]}.\n"
+            f"Fatal OSError #{err.errno}: {err.strerror}.\n"
+            "See the 'Startup failure' section of the IDLE doc, online at\n"
+            "https://docs.python.org/3/library/idle.html#startup-failure",
+            parent=root)
     root.destroy()
 
 def print_exception():