Python - enforce a list of objects from only one class type

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C#

Python

as per question, in Python2.7, i want to declare a list object that only allows objects of class 'X' to be managed (appended, deleted etc.).

Can I do this simply, do I need a class hierarchy, or...??

in C, I might do:-

GenericList<float> list1 = new GenericList<float>();

Any attempt to add an object other than type float, would result in an error.

type
Thanks

What I have tried:

Nothing - don't know how to do this , python seems loosely typed.