Merge pull request matplotlib#23073 from greglucas/rm-dummy-threading

MNT: Remove dummy_threading because threading is always available

Author: tacaswell

lib/matplotlib/backends/backend_agg.py

@@ -21,12 +21,9 @@
 .. _Anti-Grain Geometry: http://agg.sourceforge.net/antigrain.com
 """
 
-try:
-    import threading
-except ImportError:
-    import dummy_threading as threading
 from contextlib import nullcontext
 from math import radians, cos, sin
+import threading
 
 import numpy as np
 

lib/matplotlib/font_manager.py

@@ -36,12 +36,7 @@
 import re
 import subprocess
 import sys
-try:
-    import threading
-    from threading import Timer
-except ImportError:
-    import dummy_threading as threading
-    from dummy_threading import Timer
+import threading
 
 import matplotlib as mpl
 from matplotlib import _api, _afm, cbook, ft2font, rcParams
@@ -1100,7 +1095,7 @@ def __init__(self, size=None, weight='normal'):
         self.ttflist = []
 
         # Delay the warning by 5s.
-        timer = Timer(5, lambda: _log.warning(
+        timer = threading.Timer(5, lambda: _log.warning(
             'Matplotlib is building the font cache; this may take a moment.'))
         timer.start()
         try:

lib/matplotlib/pyplot.py

@@ -43,11 +43,8 @@
 from numbers import Number
 import re
 import sys
+import threading
 import time
-try:
-    import threading
-except ImportError:
-    import dummy_threading as threading
 
 from cycler import cycler
 import matplotlib