Develop a python class named Student that includes (1) class attribute counter which counts the total number instances created from this class (2) instance attribute (member data): id and name (3) __init__ method that takes self, id0 and name0 as arguments (4) a method called setmajor(self, major0) thats expand the instance attribute named major and set its value to major0 through the built-in dictionary __dict__ (5) __str__ method that shows all information about class attributes and instance attributes in the format (hint: loop all instance attributes) attribute1:value1;attibute2:value2;attribute3:value3

Sure, I can help you with that! Here's the code for the Python class named Student that meets all of your requirements:

class Student:
    counter = 0
    
    def __init__(self, id0, name0):
        self.id = id0
        self.name = name0
        Student.counter += 1
    
    def setmajor(self, major0):
        self.__dict__['major'] = major0
    
    def __str__(self):
        output = f"counter:{Student.counter};id:{self.id};name:{self.name};"
        for attr, value in self.__dict__.items():
            output += f"{attr}:{value};"
        return output

This class includes the required class attribute `counter`, which counts the total number of instances created from the class. It also includes the required instance attributes `id` and `name`, and has an `__init__` method that takes `self`, `id0`, and `name0` as arguments.

The `setmajor` method expands the instance attribute named `major` and sets its value to `major0` using the built-in dictionary `__dict__`.

Finally, the `__str__` method shows all information about both the class attributes and instance attributes in the required format. The method first includes the class attribute `counter`, and then loops through all of the instance attributes using the `items()` method on `__dict__`. It concatenates a string for each attribute-value pair, separated by semicolons, and returns the final output string.