Chapter folders renamed

Chapter02/modules_import/calcmain1.py

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+# calcmain1.py with a main function
+import mycalculator
+import myrandom
+
+def my_main( ):
+    """ This is a main function which generates two random numbers      and then apply calculator functions on them """
+    x = myrandom.random_2d( )
+    y = myrandom.random_1d( )
+    sum = mycalculator.add(x, y)
+    diff = mycalculator.subtract(x, y)
+
+    print("x = {}, y = {}".format(x, y))
+    print("sum is {}".format(sum))
+    print("diff is {}".format(diff))
+
+""" This is executed only if the special variable '__name__' is set as main"""
+if __name__ == "__main__":
+    my_main()