Hello Selman Yilmaz,

you have used search_read method which returns List of dictionaries containing the asked fields.

please check search_read method. 

@api.model
def search_read(self, domain=None, fields=None, offset=0, limit=None, order=None, **read_kwargs):
    """Perform a :meth:`search` followed by a :meth:`read`.

    :param domain: Search domain, see ``args`` parameter in :meth:`search`.
        Defaults to an empty domain that will match all records.
    :param fields: List of fields to read, see ``fields`` parameter in :meth:`read`.
        Defaults to all fields.
    :param int offset: Number of records to skip, see ``offset`` parameter in :meth:`search`.
        Defaults to 0.
    :param int limit: Maximum number of records to return, see ``limit`` parameter in :meth:`search`.
        Defaults to no limit.
    :param order: Columns to sort result, see ``order`` parameter in :meth:`search`.
        Defaults to no sort.
    :param read_kwargs: All read keywords arguments used to call read(..., **read_kwargs) method
        E.g. you can use search_read(..., load='') in order to avoid computing name_get
    :return: List of dictionaries containing the asked fields.
    :rtype: list(dict).
    """

you could use search method directly as follow

for price_list_items in self.env['product.pricelist.item'].search_read([]):

    if price_list_items.product_id.price==0:
           price_list_items.product_id.price=100      

Thanks & Regards,

​

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