Python Django getattr(): attribute name must be string

Question

I am using python, Django and get the following error:

getattr(): attribute name must be string

location: val = getattr(obj, field)

        if field in headers:
            if not isinstance(field, str):
                val = getattr(obj, field)
            else:
                val = getattr(obj, field.LastName)

            if callable(val):
                val = val()
            if type(val) == unicode:
                val = val.encode("utf-8")
            row.append(val)

I have tried many variation of code but all failed.

The error message is telling you the attribute name must be a string, and you are specifically calling getattr(obj, field) after testing that field is not a string. What did you expect to happen? — BrenBarn
– BrenBarn, Commented Jul 13, 2013 at 20:13
@BrenBarn field is a string, I have also used val = getattr(obj, "LastName") but that's also not working. As I've just started learning python I'm a naive in it. I could also upload my entire function if that doesn't flaws stackoverflow's policy... — Abhishek
– Abhishek, Commented Jul 13, 2013 at 20:18

Naltroc · Accepted Answer · 2016-11-30 17:33:54Z

5

You can confirm the object type of field by using print(type(field)). It will likely not be a string considering the error.

Looking at your code, it looks like field will be an object with attributes that are strings, such as LastName. The line

val = getattr(obj, field)

would probably be better off reading

val = getattr(obj, field.someattribute)

If field.someattribute is not a string, you can cast it to string using str(field.someattribute)

For a grand total of val = getattr(obj, str(field.someattribute))

answered Nov 30, 2016 at 17:33

Naltroc

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Campustray · Accepted Answer · 2020-07-27 17:33:51Z

5

May be you are missing the attribute name.

I was getting the same error for this

price = models.DecimalField(15, 2,)

but when I modified the code like below error was resolved.

price = models.DecimalField(max_digits=15, decimal_places=2,)

answered Jul 27, 2020 at 17:33

Campustray

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