human
Write me a the Python code you requested given the following:
I am working on the file "Sessions/Session03/Day2/OOP_solns.ipynb".
The first task is:
Problem 2c
Let's start by making an evolve method for our Galaxy class in order to evolve the galaxy forward in time.  evolve should expect an argument for time in years.  And at least initially, let's just make this a simple method that just changes the age of the galaxy by the appropriate amount.  We'll add more on to it in a second.
Because we're going to be following the evolution of this galaxy, we should create a current_state method, which returns a tuple of the attributes of the EvolvingGalaxy object at that moment.  Now as our EvolvingGalaxy changes with time, we will be able to track it and save that information somewhere.
Can you write Python code for it?
assistant
#Here is the Python code you requested.

class EvolvingGalaxy(Galaxy):
    """
    Galaxy class for representing a galaxy that can evolve over time.
    """
    def evolve(self, time):
        """
        Evolve this galaxy forward for a period time
        """
        self.age += time
 
    def current_state(self):
        return (self.total_mass, self.cold_gas_mass, self.stellar_mass, self.age, self.SFR)