How to fetch table from master?

[kolate_sambhaji]

self.append() does not work in python file in custom app.

Any idea, How to assign table data from py file.

My custom script is,

cur_frm.cscript.docs_required = function(doc, cdt, cdn) {
        var child = locals[cdt][cdn];
    cur_frm.call({
    "method": 'ef_fruits.ef_doc.ef_doc.apply_documents_required',
     "args": {
           "docs_required": doc.docs_required
        },
     callback: function(r) {
           if(!r.exc) {
           }
           }
}) 
};

python code is

@frappe.whitelist(allow_guest=True)
def apply_documents_required(self, docs_required):
        doc_req = []
        if (5==5):
        shipping_rule = frappe.get_doc("Documents Required Master", docs_required)
        frappe.msgprint("Hi @3")
        for condition in shipping_rule.get("documents_required_master"):
            doc_req = {
                "doctype": "Documents Required",
                "name_of_document": condition.name_of_document,
                "dispatch_address": condition.dispatch_address
            };
           self.append("documents_required", doc_req)
                        frappe.msgprint(condition.name_of_document)

I can get master table data in doc_req.
How to assign doc_req to “documents_required”?
“documents_required” is table field.