write attribute_line_ids in product.tempate in odoo 12 - python-3.x

Question

i am getting fields data from xls file and creating product
everything work fine except one2many field of variant in product.template
how can i achieve this.
here is my code.
main_product = self.env["product.template"].create(product_data)
attribute_ids = self.env["product.attribute"].search([])
attrib_id_set = set(ids.name for ids in attribute_ids)
product_attrib_ids = sheet.cell(suits, 13).value.split(",")
attrib_id_list = []; exist_attribute_list = []
for name in product_attrib_ids:
if name not in attrib_id_set:
attrib_id = self.env["product.attribute"].create({'name':name})
attrib_id_list.append(attrib_id)
else:
exist_attribute = self.env["product.attribute"].search([('name','=',name)])
exist_attribute_list.append(exist_attribute)
union_list = list(set(attrib_id_list).union(exist_attribute_list))
exist_attribute_values = self.env["product.attribute.value"].search([])
exist_attrib_val_list = [attrib_name.name for attrib_name in exist_attribute_values]
product_attrib_id_values = sheet.cell(suits, 14).value.split(",")
for value in product_attrib_id_values:
if value not in exist_attrib_val_list:
for ids in union_list:
attrib_value_id = self.env["product.attribute.value"].create({
'attribute_id':ids.id,
'name':value
})
main_product.write({
'attribute_line_ids':[(0,0,{
'attribute_id':ids.id, 'value_ids':(4,attrib_value_id.id)
})]
})
product_data is my dictionary for fields like name,sale_ok,type,catag_id etc.
this works, product is created, attribute_id and attribute values even works
but i can not write one2many of variant in product.template.
--EDIT--
values_lst=[]
for value in product_attrib_id_values:
if value not in exist_attrib_val_list:
for ids in union_list:
attrib_value_id = self.env["product.attribute.value"].create({
'attribute_id':ids.id,
'name':value
})
else:
for ids in exist_attribute_values:
if value == ids.name:
attrib_value_id =self.env["product.attribute.value"].browse(ids.id)
if attrib_value_id not in values_lst:
values_lst.append(attrib_value_id)