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python/demos/demo_reading_speed.py: avoid unused variable, use globals to get function name

--- a/python/demos/demo_reading_speed.py

+++ b/python/demos/demo_reading_speed.py

@@ -109,7 +109,7 @@

 def test_speed(function, filename):

     times = []

-    for i in range(10):

+    for _ in range(10):

         start = time.time()

         try:

             total_frames, samplerate = function(filename)

@@ -134,4 +134,6 @@

     filename = sys.argv[1]

     for f in test_functions:

-        test_speed(eval(f), filename)

+        # get actual function from globals

+        test_function = globals()[f]

+        test_speed(test_function, filename)