Chapter folders renamed

Chapter02/modules_import/calcmain3.py

@@ -0,0 +1,22 @@
+# calcmain3.py with from and alias combined
+from mycalculator import add as my_add
+from mycalculator import subtract as my_subtract
+from myrandom import random_2d, random_1d
+
+def my_main():
+    """ This is a main function which generates two random numbers and then apply calculator functions on them """
+    x = random_2d()
+    y = random_1d()
+
+    sum =  my_add(x,y)
+    diff = my_subtract(x,y)
+
+    print("x = {}, y = {}".format(x,y))
+    print("sum is {}".format(sum))
+    print("diff is {}".format(diff))
+
+    print (globals())
+
+""" This is executed only if the special variable '__name__' is set as main"""
+if __name__ == "__main__":
+    my_main()