Make a Python script interact with a running Python script

I have two Python scripts, a.py and b.py. A.py is running and is not writable and I would like to have b.py being able to retrieve data from it, like a list of used variables and their values, functions, class... I am finding nothing on the Internet so is this possible ? Thanks.

Example a.py

def numberOne(var):
    var1 = input('Enter a value : ')

class testClass():
    def __init__(self, value)
        self.var2 = value

var3 = 12345

Example b.py output

Found class : 
-- testClass

Found functions :
-- numberOne

Found vars :
-- var3 : 12345