Simplify string formatting code

Author: maillouxc

part2/experiments.py

@@ -40,7 +40,8 @@ def main():
  else:
  num_wrongly_classified += 1
 
- print("Accuracy of SVM classifier was " + str("{0:.3%}").format(numpy.mean(results == test_labels)))
+ accuracy = str("{0:.3%}").format(numpy.mean(results == test_labels))
+ print("Accuracy of SVM classifier was " + accuracy)
 
 
 def parse_command_line_arguments():