python 3 classes problem

[oliverjrose99]

when i try and run say "test = person("Test", 99, "99/99/99")",  i get the error "local variable 'population' referenced before assignment". how can i fix this, thanks

 

code:

people = []population = 0class person:    def __init__(self, name, age, dob):        self.name = name        self.age = age        self.dob = dob        people.append(self.name)        population = population + 1        print("%s was born on %s and is currently %s" % (self.name, self.dob, self.age))    def __del__(self):        print("%s has been removed" % (self.name))

[aikoels]

When using a variable in a class it needs to be local (in the class), or global (out of the function).

 

Your variable is global because it is out of the function, and the only way to use variables like the way you are is to add the line "global population" in the top line of the function (or you may be able to use the first line of the class, not the functions, not 100%)

 

Edit: also you may want to fix the line population = population + 1 to "population += 1" since it is the more used format

 

Also noticed that your del function doesn't delete the name from the list, you may want to fix that

[oliverjrose99]

thanks