Can a file opened in read mode be considered an internal data type in a programming language?

In Python, an open file is represented by an object of type TextIOWrapper (or another subclass of IOBase), which is created when calling the open() function. This object can be considered as an internal data type, as it is implemented at the language and standard library level, and has its own methods and properties for working with file streams.

However, from the language's perspective, it is not a primitive data type, but an object that implements the file stream interface. That is, an open file is an instance of a class that provides a specific API for reading, writing, and managing the file.

Example:

f = open('example.txt', 'r')
print(type(f))  # <class '_io.TextIOWrapper'>
content = f.read()
f.close()

Thus, an open file is an internal language object, but not a primitive data type, rather an object with a defined interface.