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program no 1.py

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+# Program no 1
+
+print "Twinkle, twinkle, little star,\n\tHow I wonder what you are,\n\t\tUp above the world so high!\n\t\tLike a diamond in the sky.\nHow I wonder what you are,\n\tUp above the world so high" 

program2.py

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+# Program no 2
+
+import sys
+print("Python version")
+print (sys.version)
+print("Version info.")
+print (sys.version_info)

program3.py

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+# Program no 3
+
+from datetime import datetime
+# datetime object containing current date and time
+now = datetime.now()
+
+
+dt_string = now.strftime("%d/%m/%Y %H:%M:%S")
+print("date and time =", dt_string)	

program4.py

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+# Program no 4
+
+from math import pi
+
+radius = float(input ("Input the radius of the circle : "))
+print ("The area of the circle with radius " + str(radius) + " is: " + str(pi * radius**2))

program5.py

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+# Program no 5
+
+1stname = input(" Enter 1st name ")
+lastname = input(" Enter last name ")
+
+print 1stname[::-1]
+print lastname[::-1]

program6.py

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+# Program no 6
+
+num1 = input(" Enter 1st num ")
+num2 = input(" Enter second num ")
+
+print ("The addition of num1 and num2 is : "num1+num2)