File: diff.py

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#Example diff.py

def f(x):
        return x**3

def deriv(x,dx=0.005):
        df = f(x+dx/2)-f(x-dx/2)
        return df/dx

print( deriv(2.0))
print( deriv(2.0, 0.1))
print( deriv(2.0, 0.0001))