🐛 fix print syntax

source/Input_Output.rst

@@ -26,7 +26,7 @@ We wait same behavior as the shell *cat* command. ::
          sys.exit("no such file: {0}".format(path)
       with open(path, 'r') as infile:
          for line in infile:
-            print line
+            print(line)
          
 Exercise
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