--- a/Doc/includes/mp_pool.py
+++ b/Doc/includes/mp_pool.py
@@ -10,10 +10,10 @@
 import random
 import sys
 
+
 #
 # Functions used by test code
 #
-
 def calculate(func, args):
     result = func(*args)
     return '%s says that %s%s = %s' % (
@@ -21,30 +21,36 @@
         func.__name__, args, result
         )
 
+
 def calculatestar(args):
     return calculate(*args)
 
+
 def mul(a, b):
-    time.sleep(0.5*random.random())
+    time.sleep(0.5 * random.random())
     return a * b
 
+
 def plus(a, b):
-    time.sleep(0.5*random.random())
+    time.sleep(0.5 * random.random())
     return a + b
 
+
 def f(x):
-    return 1.0 / (x-5.0)
+    return 1.0 / (x - 5.0)
+
 
 def pow3(x):
-    return x**3
+    return x ** 3
+
 
 def noop(x):
     pass
 
+
 #
 # Test code
 #
-
 def test():
     print('cpu_count() = %d\n' % multiprocessing.cpu_count())
 
@@ -107,9 +113,9 @@
           (N, time.time() - t))
 
     t = time.time()
-    C = list(pool.imap(pow3, range(N), chunksize=N//8))
+    C = list(pool.imap(pow3, range(N), chunksize=N // 8))
     print('\tlist(pool.imap(pow3, range(%d), chunksize=%d)):\n\t\t%s' \
-          ' seconds' % (N, N//8, time.time() - t))
+          ' seconds' % (N, N // 8, time.time() - t))
 
     assert A == B == C, (len(A), len(B), len(C))
     print()
@@ -129,9 +135,9 @@
           (time.time() - t))
 
     t = time.time()
-    C = list(pool.imap(noop, L, chunksize=len(L)//8))
+    C = list(pool.imap(noop, L, chunksize=len(L) // 8))
     print('\tlist(pool.imap(noop, L, chunksize=%d)):\n\t\t%s seconds' % \
-          (len(L)//8, time.time() - t))
+          (len(L) // 8, time.time() - t))
 
     assert A == B == C, (len(A), len(B), len(C))
     print()