How to add / update dict fields


Currently, I would like to put the weight into a product using product attribute.
This product is UOM = Pack/Unit. But I need to put the weight to the variant.

In the database, i can see the fields “attributes” in product.product with string something like this {“weight”:55}.

How to update this value in python?

product = Product(2)
product.attributes = ‘{“weight”: 123}’

it give me the error

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/home/coder/project/env/lib/python3.6/site-packages/trytond/model/", line 31, in newfunc
    return self.func(owner, [instance], *args, **kwargs)
  File "/home/coder/project/env/lib/python3.6/site-packages/trytond/model/", line 1712, in save
    (([r], save_values[r]) for r in to_write), ()))
  File "/home/coder/project/env/lib/python3.6/site-packages/trytond_stock-5.6.0-py3.6.egg/trytond/modules/stock/", line 65, in decorator
    func(cls, *args)
  File "/home/coder/project/env/lib/python3.6/site-packages/trytond_stock-5.6.0-py3.6.egg/trytond/modules/stock/", line 159, in write
    super(Product, cls).write(*args)
  File "/home/coder/project/env/lib/python3.6/site-packages/trytond/modules/product/", line 496, in write
  File "/home/coder/project/env/lib/python3.6/site-packages/trytond/model/", line 159, in wrapper
    return func(cls, *args, **kwargs)
  File "/home/coder/project/env/lib/python3.6/site-packages/trytond/model/", line 980, in write
  File "/home/coder/project/env/lib/python3.6/site-packages/trytond/model/fields/", line 48, in sql_format
    value = super().sql_format(value)
  File "/home/coder/project/env/lib/python3.6/site-packages/trytond/model/fields/", line 352, in sql_format
    value = self._py_type(value)
ValueError: dictionary update sequence element #0 has length 1; 2 is required

You must assign a dictionary to the field:

product.attributes = {'weight': 123}

Thank @ced,

It is working

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