Scientific Hello World script

All computer languages intros start with a program that prints "Hello, World!" to the screen
Scientific computing extension: read a number, compute its sine value, and print out
The script, called hw.py, should be run like this: 
python hw.py 3.4
or just (Unix) 
./hw.py 3.4
Output: 
Hello, World! sin(3.4)=-0.255541102027

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