<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _precision(self, value):
 """Return the precision of the number :param str value: The value to find the precision of :rtype: int """

        value = str(value)
        decimal = value.rfind('.')
        if decimal == -1:
            return 0
        return len(value) - decimal - 1