diff --git a/Chapter2/mypackage_mains/pkgmain3.py b/Chapter2/mypackage_mains/pkgmain3.py
new file mode 100644
index 0000000..1c24894
--- /dev/null
+++ b/Chapter2/mypackage_mains/pkgmain3.py
@@ -0,0 +1,27 @@
+# pkgmain3.py with with main function
+
+import masifutil
+
+
+def my_main():
+    """ This is a main function which generates two random numbers and then apply calculator functions on them """
+    x = masifutil.random_2d()
+    y = masifutil.random_1d()
+
+    sum = masifutil.add(x,y)
+    diff = masifutil.subtract(x,y)
+
+    sroot = masifutil.sqrt(x)
+    log10x = masifutil.log(x)
+    log2x = masifutil.ln(x)
+
+    print("x = {}, y = {}".format(x, y))
+    print("sum is {}".format(sum))
+    print("diff is {}".format(diff))
+    print("square root is {}".format(sroot))
+    print("log base of 10 is {}".format(log10x))
+    print("log base of 2 is {}".format(log2x))
+
+""" This is executed only if the special variable '__name__' is set as main"""
+if __name__ == "__main__":
+    my_main()
\ No newline at end of file
diff --git a/Chapter2/mypackage_mains/pkgmain4.py b/Chapter2/mypackage_mains/pkgmain4.py
new file mode 100644
index 0000000..96c09a5
--- /dev/null
+++ b/Chapter2/mypackage_mains/pkgmain4.py
@@ -0,0 +1,30 @@
+# pkgmain4.py with with main function
+
+import sys
+sys.path.append('/Users/muasif/Google Drive/PythonForGeeks/source_code/chapter2/mypackages')
+
+import masifutil
+
+
+def my_main():
+    """ This is a main function which generates two random numbers and then apply calculator functions on them """
+    x = masifutil.random_2d()
+    y = masifutil.random_1d()
+
+    sum = masifutil.add(x,y)
+    diff = masifutil.subtract(x,y)
+
+    sroot = masifutil.sqrt(x)
+    log10x = masifutil.log(x)
+    log2x = masifutil.ln(x)
+
+    print("x = {}, y = {}".format(x, y))
+    print("sum is {}".format(sum))
+    print("diff is {}".format(diff))
+    print("square root is {}".format(sroot))
+    print("log base of 10 is {}".format(log10x))
+    print("log base of 2 is {}".format(log2x))
+
+""" This is executed only if the special variable '__name__' is set as main"""
+if __name__ == "__main__":
+    my_main()
\ No newline at end of file
diff --git a/Chapter2/mypackage_mains/pkgmain5.py b/Chapter2/mypackage_mains/pkgmain5.py
new file mode 100644
index 0000000..86ddfc5
--- /dev/null
+++ b/Chapter2/mypackage_mains/pkgmain5.py
@@ -0,0 +1,30 @@
+# pkgmain5.py with with main function
+
+import site
+site.addsitedir('/Users/muasif/Google Drive/PythonForGeeks/source_code/chapter2/mypackages')
+
+import masifutil
+
+
+def my_main():
+    """ This is a main function which generates two random numbers and then apply calculator functions on them """
+    x = masifutil.random_2d()
+    y = masifutil.random_1d()
+
+    sum = masifutil.add(x,y)
+    diff = masifutil.subtract(x,y)
+
+    sroot = masifutil.sqrt(x)
+    log10x = masifutil.log(x)
+    log2x = masifutil.ln(x)
+
+    print("x = {}, y = {}".format(x, y))
+    print("sum is {}".format(sum))
+    print("diff is {}".format(diff))
+    print("square root is {}".format(sroot))
+    print("log base of 10 is {}".format(log10x))
+    print("log base of 2 is {}".format(log2x))
+
+""" This is executed only if the special variable '__name__' is set as main"""
+if __name__ == "__main__":
+    my_main()
\ No newline at end of file
diff --git a/Chapter2/mypackages/masifutil/__init__.py b/Chapter2/mypackages/masifutil/__init__.py
new file mode 100644
index 0000000..4b6a106
--- /dev/null
+++ b/Chapter2/mypackages/masifutil/__init__.py
@@ -0,0 +1,4 @@
+
+from .mycalculator import add, subtract
+from .myrandom import random_1d, random_2d
+from .advcalc.advcalculator import sqrt, log, ln
\ No newline at end of file
diff --git a/Chapter2/mypackages/masifutil/advcalc/advcalculator.py b/Chapter2/mypackages/masifutil/advcalc/advcalculator.py
new file mode 100644
index 0000000..588eee1
--- /dev/null
+++ b/Chapter2/mypackages/masifutil/advcalc/advcalculator.py
@@ -0,0 +1,14 @@
+# advcalculator.py with sqrt,log and ln functions
+import math
+
+def sqrt(x):
+   """This function takes square root of a number"""
+   return math.sqrt(x)
+
+def log(x):
+   """This function returns log of base 10"""
+   return math.log(x,10)
+
+def ln(x):
+   """This function returns log of base 2"""
+   return math.log(x,2)
\ No newline at end of file
diff --git a/Chapter2/mypackages/masifutil/mycalculator.py b/Chapter2/mypackages/masifutil/mycalculator.py
new file mode 100644
index 0000000..7872eac
--- /dev/null
+++ b/Chapter2/mypackages/masifutil/mycalculator.py
@@ -0,0 +1,9 @@
+# mycalculator.py with add and subtract functions
+
+def add(x, y):
+   """This function adds two numbers"""
+   return x + y
+
+def subtract(x, y):
+   """This function subtracts two numbers"""
+   return x - y
diff --git a/Chapter2/mypackages/masifutil/myrandom.py b/Chapter2/mypackages/masifutil/myrandom.py
new file mode 100644
index 0000000..b4a45fd
--- /dev/null
+++ b/Chapter2/mypackages/masifutil/myrandom.py
@@ -0,0 +1,14 @@
+# myrandom.py with default and custom random functions
+import random
+
+def random_1d():
+   """This function get a random number between 0 and 9"""
+   return random.randint(0,9)
+
+def random_2d():
+   """This function get a random number between 10 and 99"""
+   return random.randint(10,99)
+
+def get_random(lower, upper):
+   """This function get a random number between lower and upper"""
+   return random.randint(lower,upper)
\ No newline at end of file