How to override core python class method in custom python file?

Frappe Framework Customization
1

import frappe
from erpnext.accounts.doctype.sales_invoice.sales_invoice import SalesInvoice

def shoutout(self):
print(“Yay!”)

def before_cancel(self):
self.shoutout()
self.update_time_sheet(None)

def build_my_thing():
SalesInvoice.shoutout = shoutout
SalesInvoice.before_cancel = before_cancel

I have tested above code but its not working in my case. As I have to override method which is linked with several methods in same core python file.
Here is my code
def g_entry(self):
print(“HELLO”) #this for test
self.check_permission(‘write’)
earnings = self.get_salary_component_total(component_type = “earnings”) or {}
deductions = self.get_salary_component_total(component_type = “deductions”) or {}
default_payroll_payable_account = self.get_default_payroll_payable_account()
jv_name = “”
precision = frappe.get_precision(“Journal Entry Account”, “debit_in_account_currency”)

		if earnings or deductions:
			journal_entry = frappe.new_doc('Journal Entry')
			journal_entry.voucher_type = 'Journal Entry'
			journal_entry.user_remark = _('Accrual Journal Entry for salaries from {0} to {1}')\
				.format(self.start_date, self.end_date)
			journal_entry.company = self.company
			journal_entry.posting_date = self.posting_date

# I want add below line in this code in custom python file:
journal_entry.naming_series = self.naming_series
I am new ERPNEXT. Please Help Me…

2

I have same kind of problem, but I have to apply some condition in custom py file and I want to override the core class method in my custom file

Any solution on Override method then please suggest

3

my working code in the custom app’s hooks.py is like below

from erpnext.stock.doctype.item.item import Item

def cant_change(self):
    pass

Item.cant_change = cant_change
3 Likes
4

@szufisher, Thank you so much.