<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def from_other(cls, item):
 """Factory function to return instances of `item` converted into a new instance of ``cls``. Because this is a class method, it may be called from any bitmath class object without the need to explicitly instantiate the class ahead of time. *Implicit Parameter:* * ``cls`` A bitmath class, implicitly set to the class of the instance object it is called on *User Supplied Parameter:* * ``item`` A :class:`bitmath.Bitmath` subclass instance *Example:* KiB(1024.0) """

        if isinstance(item, Bitmath):
            return cls(bits=item.bits)
        else:
            raise ValueError("The provided items must be a valid bitmath class: %s" %
                             str(item.__class__))