Move range out of the loop

Author: mdboom

pyperformance/data-files/benchmarks/bm_ctypes/run_benchmark.py

@@ -60,10 +60,12 @@ def benchmark(loops):
     void_foo_int_int_int_int = ext.void_foo_int_int_int_int
     void_foo_constchar = ext.void_foo_constchar
 
+    range_it = range(loops)
+
     # Test calling the functions using the implied arguments mechanism
     t0 = pyperf.perf_counter()
 
-    for i in range(loops):
+    for _ in range_it:
         void_foo_void()
         int_foo_int(1)
         void_foo_int(1)