How to print variable name?

[mayadob]

>>> x, y = 7, 42
>>> name_x_as_string = f'{x=}'.split('=')[0]
>>> name_y_as_string = f'{y=}'.split('=')[0]
>>> f'The length of {name_x_as_string}{name_y_as_string} is {x + y}'
'The length of xy is 49'

It might be something like this.

But still I need it to be in function. I want to call the function with variables like this:

def length(x,y):
    name_x_as_string = f'{x=}'.split('=')[0]
    name_y_as_string = f'{y=}'.split('=')[0]
    print(f'The length of {name_x_as_string}{name_y_as_string} is {x + y}')

a=5
b=3
length(a,b)

The result here is:

The length of xy is 8

It's not what I need. The result should be:

The length of ab is 8

Is it understandable?