diff --git a/python/simple_calculator.py b/python/simple_calculator.py
new file mode 100644
index 0000000..b47b8bf
--- /dev/null
+++ b/python/simple_calculator.py
@@ -0,0 +1,31 @@
+def calculator():
+    print " List of the fuctions  : "
+    print " 1. Add "
+    print " 2. Sub "
+    print " 3. Mul "
+    print " 4. Div "
+    opt=input(" Enter your number => ")
+    if opt==01:
+        a=input(" Enter your first number : ")
+        b=input(" Enter your second number: ")
+        c=a+b
+        print c
+    elif opt==02:
+        a=input(" Enter your first number : ")
+        b=input(" Enter your second number: ")
+        c=a-b
+        print c
+    elif opt==03:
+        a=input(" Enter your first number : ")
+        b=input(" Enter your second number: ")
+        c=a*b
+        print c
+    elif opt==04:
+        a=input(" Enter your first number : ")
+        b=input(" Enter your second number: ")
+        c=a/b
+        print c
+    else :
+        print " wrong command : "
+        calculator()
+calculator()
diff --git a/python/text to binary.py b/python/text to binary.py
new file mode 100644
index 0000000..127c8e9
--- /dev/null
+++ b/python/text to binary.py	
@@ -0,0 +1,19 @@
+def string2bits(s=''):
+    return [bin(ord(x))[2:].zfill(8) for x in s]
+
+def bits2string(b=None):
+    return ''.join([chr(int(x, 2)) for x in b])
+
+s = 'Hello, World!'
+b = string2bits(s)
+s2 = bits2string(b)
+
+print 'String:'
+print s
+
+print '\nList of Bits:'
+for x in b:
+    print x
+
+print '\nString:'
+print s2