PARI-Python intnum

This is how intnum works with my module:

>>> import pari
>>> def f(x):
...     return x^2
...
>>> pari.intnum(0,1,f)
0.3333333333333333333333333333

Actually it works faster than in the standard PARI shell. The reason, I think, is that every time PARI wants to compute the value of the function we integrate it parses the string defining the function. In my case I simply do a function call which is faster.

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