Handling command-line args (1)

The first three arguments define the m values: 
try:
    m_min = float(sys.argv[1])
    m_max = float(sys.argv[2])
    dm    = float(sys.argv[3])
except:
    print 'Usage:',sys.argv[0],\
    'm_min m_max m_increment [ simviz1.py options ]'
    sys.exit(1)
Pass the rest of the arguments, sys.argv[4:], to simviz1.py
Problem: sys.argv[4:] is a list, we need a string 
['-b','5','-c','1.1'] -> '-b 5 -c 1.1'

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