How to convert a list of multiple integers into a single integer?

Question

How do I convert a list in Python 3.5 such as:

x=[1, 3, 5]

to an int of 135 (a whole int)?

Answer 1

Here is a more mathematical way that does not have to convert back and forth to string. Note that it will only work if 0 <= i <= 9.

>>> x = [1, 3, 5]
>>> sum(d * 10**i for i, d in enumerate(x[::-1]))
135

The idea is to multiply each element in the list by its corresponding power of 10 and then to sum the result.