update from atlas

02-array-seq/listcomp_speed.py

@@ -0,0 +1,18 @@
+import timeit
+
+TIMES = 10000
+
+SETUP = """
+symbols = '$¢£¥€¤'
+def non_ascii(c):
+    return c > 127
+"""
+
+def clock(label, cmd):
+    res = timeit.repeat(cmd, setup=SETUP, number=TIMES)
+    print(label, *('{:.3f}'.format(x) for x in res))
+
+clock('listcomp        :', '[ord(s) for s in symbols if ord(s) > 127]')
+clock('listcomp + func :', '[ord(s) for s in symbols if non_ascii(ord(s))]')
+clock('filter + lambda :', 'list(filter(lambda c: c > 127, map(ord, symbols)))')
+clock('filter + func   :', 'list(filter(non_ascii, map(ord, symbols)))')