Basic execution - SymPy

[jiju]

Hi,

I have successfully installed SymPiy. Consider the following python  script test.py with output -sin(x) as expected

from sympy import *
var('x')
print diff(cos(x), x)

I would like to pass diff(cos(x), x) as a command line argument to python  script as python test.py  diff(cos(x), x). Could you help me in how to execute this then?

I tried to use print os.system(sys.argv[1]) which is not working! Thanks in advance


[Ondřej Čertík]

Just do this:

import sys

from sympy import *
var("x")

print eval(sys.argv[1])


And call it like this (don't forget the quotes):

$ python test.py "diff(cos(x), x)"
-sin(x)


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[jiju]

Thanks Ondrej Certík, it worked !.