diff --git a/classes/class1.py b/classes/class1.py
index a504d9d..583194b 100644
--- a/classes/class1.py
+++ b/classes/class1.py
@@ -2,7 +2,7 @@ class student():
     name = "rakesh"
     website ="binarynote.com"
     expertise ="PHP, CSS, HTML,JavaScript,JQuery,WordPress and Now Python Django"
-
+    
     def showMessage(self):
         print("This is a demo message from class ")
 
diff --git a/classes/class2.py b/classes/class2.py
new file mode 100644
index 0000000..eedb656
--- /dev/null
+++ b/classes/class2.py
@@ -0,0 +1,22 @@
+class student():
+    name = "rakesh"
+    website ="binarynote.com"
+    expertise ="PHP, CSS, HTML,JavaScript,JQuery,WordPress and Now Python Django"
+
+    def setData(self,name,web,exp):
+        self.name = name
+        self.website = web
+        self.expertise = exp
+    
+    def showData(self):
+        print("Name : ",self.name)
+        print("website  : ", self.website)
+        print("Expertise :", self.expertise,"\n")
+
+#object creation
+s = student()  
+s.showData()
+
+# set new Data using another function
+s.setData("Swarnima", 'swarnima.com','Python, Django, CSS, JavaScript')
+s.showData()
\ No newline at end of file
diff --git a/classes/classConstructor.py b/classes/classConstructor.py
new file mode 100644
index 0000000..e8e2997
--- /dev/null
+++ b/classes/classConstructor.py
@@ -0,0 +1,21 @@
+class student():
+    name=""
+    website=""
+    expertise=""
+    
+    def __init__(self):
+        self.name ="swarnima"
+        self.website = "http://www.swarnima.com"
+        self.expertise ="Django Specialist"
+
+    def showData(self):
+        print("Name : ",self.name)
+        print("website  : ", self.website)
+        print("Expertise :", self.expertise,"\n")
+
+#object creation
+#
+
+s1 = student()  #calling constructor
+s1.showData()
+
diff --git a/first3char.py b/first3char.py
new file mode 100644
index 0000000..a396635
--- /dev/null
+++ b/first3char.py
@@ -0,0 +1,9 @@
+def front3(str):
+    str1 = str[:3]*3
+    print(str1)
+
+front3('java')
+front3('Chocolate')
+front3('ab')
+front3('a')
+front3('') 
\ No newline at end of file
diff --git a/functions/factorial.py b/functions/factorial.py
new file mode 100644
index 0000000..2221b95
--- /dev/null
+++ b/functions/factorial.py
@@ -0,0 +1,9 @@
+def factorial():
+    n = int(input("Enter any number "))
+    fact = 1
+    for i in range(1,n+1):
+        fact *= i
+    print("Factorial of ", n ," is :",fact)
+
+#function call 
+factorial()
\ No newline at end of file
diff --git a/functions/factorial_value.py b/functions/factorial_value.py
new file mode 100644
index 0000000..8cfd218
--- /dev/null
+++ b/functions/factorial_value.py
@@ -0,0 +1,9 @@
+def factorial(n):
+    fact = 1
+    for i in range(1,n+1):
+        fact *= i
+    print("Factorial of ", n ," is :",fact)
+
+#function call 
+n = int(input("Enter any number "))
+factorial(n)
\ No newline at end of file
diff --git a/functions/recursive_factorial.py b/functions/recursive_factorial.py
new file mode 100644
index 0000000..6adec87
--- /dev/null
+++ b/functions/recursive_factorial.py
@@ -0,0 +1,10 @@
+def factorial(n):
+    if n==1:
+        return 1
+    else:
+        return n*(factorial(n-1))
+
+#function call 
+n = int(input("Enter any number "))
+result = factorial(n)
+print("factorial of {} is  {} ".format(n,result))
\ No newline at end of file
diff --git a/string/string1.py b/string/string1.py
new file mode 100644
index 0000000..fa9c8b2
--- /dev/null
+++ b/string/string1.py
@@ -0,0 +1,6 @@
+str = "This is me rakesh"
+n = len(str)
+print('Length of string is : ',n)
+str = str + "Hello rakesh"
+print(str)
+print(str[0])
\ No newline at end of file
diff --git a/sum_digit.py b/sum_digit.py
index 98f83d1..19e6188 100644
--- a/sum_digit.py
+++ b/sum_digit.py
@@ -1,6 +1,6 @@
-a  = int(input("Enter any number :")
-         
-while a!=0:
+a  = int(input("Enter any number :"))
+sum =0      
+while (a!=0):
         rem = a%10
         sum = sum + rem
         a = int(a / 10)