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>>> import callback
>>> print(callback.foo.__doc__)
r = foo(fun,[fun_extra_args])
Wrapper for ``foo``.
Parameters
----------
fun : call-back function
Other Parameters
----------------
fun_extra_args : input tuple, optional
Default: ()
Returns
-------
r : float
Notes
-----
Call-back functions::
def fun(i): return r
Required arguments:
i : input int
Return objects:
r : float
>>> def f(i): return i*i
...
>>> print(callback.foo(f))
110.0
>>> print(callback.foo(lambda i:1))
11.0
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