Welcome!

example of solution using the product variant ID (so it works for template and variants) instead of sequence and using prefixes similar to the configurable on the sequences (image from Odoo 18.0):

• create the following automation rule

# Get the current year (without century) and week of the year
current_year = time.strftime('%y') #e.g.,"25" for 2025
week_of_year = time. strftime('%W') #e.g., "33" for the 33rd week
# Get the product ID
product_id = record.id
# Generate the product code
product_code = "PC" + current_year + week_of_year.zfill(2) + str(product_id)
# Set the product code
record['default_code'] = product_code

create the following sequence:

create the following automation rules (with studio if installed) for the product variant model (to works for variants and templates:

for record in records:
    if not record.default_code:  # Only generate if not already set
        seq = env['ir.sequence'].next_by_code('product.code')
        record.write({'default_code': seq})