Typeerror: Isinstance() Arg 2 Must Be A Type Or Tuple Of Types >>>

>>> names=['jill','jack'] >>> isinstance(names,list) Traceback (most recent call last): File '', line 1, in isinstance(nam

Solution 1:

You've stomped on list by assigning to a local variable of the same name. Don't do that.

Solution 2:

Apply this one :

ifisinstance(names, type(list)):

Solution 3:

But this works in Python (v3.7.1:260ec2c36a, Oct 20 2018, 14:05:16) [MSC v.1915 32 bit (Intel)] on win32：

>>>names=['jill', 'jack']>>>isinstance(names, list)
True

Solution 4:

This can also happen if you've accidentally messed up the foreign key field syntax in your model. When writing a foreign key field, you can have:

ModelName

or:

'app_name.ModelName'

but you cannot have:

'ModelName'

Learnt that one the hard way.