Chapter folders renamed

Chapter04/files/writereadfile.py

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+#writereadfile.pywrite to a file and then read from it
+f1 = open("myfile.txt",'w')
+f1.write("This is a sample file\n")
+lines =["This is a test data\n", "in two lines\n"]
+f1.writelines(lines)
+f1.close()
+
+f2 = open("myfile.txt",'r')
+print(f2.read(4))
+print(f2.readline())
+print(f2.readline())
+
+f2.seek(0)
+for line in f2.readlines():
+    print(line)
+f2.close()