Using Python... You have to do your chemistry homework, but you hate looking up

Question

Using Python...

You have to do your chemistry homework, but you hate looking up elements on the periodic table! Write a program that takes the name of an element (as a string, independent of case) from standard input and prints a double representing its atomic weight to standard output. Only implement the program for the first three elements, hydrogren, helium, and lithium, which have the respective atomic weights 1.008, 4.0026, and 6.94. If anything else is given as input, print the statement "Sorry, I don't recognize that element!"

Explanation / Answer

atom=raw_input('Enter The Name of Element Name : ')
if (atom=="hydrogen"):
    atom_weight=1.008
    print "Atomic Weight of ",atom," is : ",atom_weight
elif(atom=="helium"):  
    atom_weight=4.0026
    print "Atomic Weight of ",atom," is : ",atom_weight
elif(atom=="lithium"):  
    atom_weight=6.94
    print "Atomic Weight of ",atom," is : ",atom_weight
else:
    print("Sorry, I don't recognize that element!")

Output 1

Enter The Name of Element Name : lithium
Atomic Weight of lithium is : 6.94

Output 2

Enter The Name of Element Name : carbon
Sorry, I don't recognize that element!

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