The code

File hw.py:
#!/usr/bin/env python

# load system and math module:
import sys, math       

# extract the 1st command-line argument:
r = float(sys.argv[1]) 

s = math.sin(r)

print "Hello, World! sin(" + str(r) + ")=" + str(s)
Make the file executable (on Unix):
chmod a+rx hw.py

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