diff --git a/Lib/idlelib/macosx.py b/Lib/idlelib/macosx.py
index 53848fb079eab1..12399f152aea2a 100644
--- a/Lib/idlelib/macosx.py
+++ b/Lib/idlelib/macosx.py
@@ -4,6 +4,7 @@
from os.path import expanduser
import plistlib
from sys import platform # Used in _init_tk_type, changed by test.
+from test.support import requires, ResourceDenied
import tkinter
@@ -14,23 +15,26 @@
_tk_type = None
def _init_tk_type():
- """
- Initializes OS X Tk variant values for
- isAquaTk(), isCarbonTk(), isCocoaTk(), and isXQuartz().
+ """ Initialize _tk_type for isXyzTk functions.
"""
global _tk_type
if platform == 'darwin':
- root = tkinter.Tk()
- ws = root.tk.call('tk', 'windowingsystem')
- if 'x11' in ws:
- _tk_type = "xquartz"
- elif 'aqua' not in ws:
- _tk_type = "other"
- elif 'AppKit' in root.tk.call('winfo', 'server', '.'):
- _tk_type = "cocoa"
+ try:
+ requires('gui')
+ except ResourceDenied: # Possible when testing.
+ _tk_type = "cocoa" # Newest and most common.
else:
- _tk_type = "carbon"
- root.destroy()
+ root = tkinter.Tk()
+ ws = root.tk.call('tk', 'windowingsystem')
+ if 'x11' in ws:
+ _tk_type = "xquartz"
+ elif 'aqua' not in ws:
+ _tk_type = "other"
+ elif 'AppKit' in root.tk.call('winfo', 'server', '.'):
+ _tk_type = "cocoa"
+ else:
+ _tk_type = "carbon"
+ root.destroy()
else:
_tk_type = "other"
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