Use os.pardir when modifying sys.path

Author: hnakamur

ch05/train_neuralnet.py

@@ -1,6 +1,6 @@
 # coding: utf-8
 import sys, os
-sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+sys.path.append(os.pardir)
 
 import numpy as np
 from dataset.mnist import load_mnist
@@ -43,4 +43,4 @@
         test_acc = network.accuracy(x_test, t_test)
         train_acc_list.append(train_acc)
         test_acc_list.append(test_acc)
-        print(train_acc, test_acc)
+        print(train_acc, test_acc)