What is the meaning of “int(a[::-1])” in Python? [duplicate]

Assuming a is a string. The Slice notation in python has the syntax –

list[<start>:<stop>:<step>]

So, when you do a[::-1], it starts from the end towards the first taking each element. So it reverses a. This is applicable for lists/tuples as well.

Example –

>>> a="1234"
>>> a[::-1]
'4321'

Then you convert it to int and then back to string (Though not sure why you do that) , that just gives you back the string.