<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _pfp__set_value(self, value):
 """Initialize the struct. Value should be an array of fields, one each for each struct member. :value: An array of fields to initialize the struct with :returns: None """

        if self._pfp__frozen:
            raise errors.UnmodifiableConst()
        if len(value) != len(self._pfp__children):
            raise errors.PfpError("struct initialization has wrong number of members")

        for x in six.moves.range(len(self._pfp__children)):
            self._pfp__children[x]._pfp__set_value(value[x])