Make a function named first_4 that accepts an iterable as an argument and returns the first 4 items in the iterable.

Thank you for your response but I have a question here. So must it(parameter) always be referenced with a name and not a number?

Yes, Rakshith. And it's because the parameter must be a valid Python variable name. 23 is not a valid variable name. Take a look at this method:

def add(x, y):
  return x + y

print(add(100 + 50))

If you run this code it will print 150 to the screen. We send in 100 and 50. x is now equal to 100 inside that function and y is now equal to 50. Remember long ago when you did things like x = 100 and y = 50? This is similar to that except that it's receiving the values from elsewhere and setting the parameters equal to those values. As such this means that those parameter names must be something that you could normally use for a variable name.

If you try and run this:

def subtract(100, 50):
  return 100 - 50

print(subtract(20, 30))

You will receive a compiler error. This is because neither 100 nor 50 are valid variable names-

Hope this clarifies things!