cProfile, timed call tree

[Nico Schlömer]

Hi everyone,

>From what I understand about the Python profilers, the type of information
you get from a stats object is

  * How much time was spent in function X,
  * what the callers and callees of function X are, and
  * and bunch of meta info about function X.

With the program
```
def prime(n):
    # compute the n-th prime number, takes longer for larger n
    return 2

def a():
    return prime(1)

def b():
    return prime(4000)

a()
b()
```
I would be able to find that `prime` took a lot of time, but not that it
took more time when called from `b()`. In other words: I cannot construct
the call tree with times from Stats.

Is this correct? If not, how to get a timed call tree from Stats? Perhaps
that's not the right think to work with?

Cheers,
Nico