'n(addr, ndx = 0) -> str
Leak `numb` bytes at `addr`.
Returns:
A string with the leaked bytes, will return `None` if any are missing
Examples:
>>> import string
>>> data = string.ascii_lowercase
>>> l = MemLeak(lambda a: data[a:a+4], reraise=False)
>>> l.n(0,1) == \'a\'
True
>>> l.n(0,26) == data
True
>>> len(l.n(0,26)) == 26
True
>>> l.n(0,27) is None
True'

def n(self, addr, numb):

    return (self._leak(addr, numb) or None)
