Add python one-liner to convert list of ints to a single int

@@ -246,3 +246,9 @@ zipped = list(zip(list1, list2))

bytes.fromhex(hex_string)

```

**Example:** `"48656c6c6f" → b'Hello'`

## Convert a list of integers into a single integer

```python

res = int("".join(map(str, items)))

```

**Example:** `[1, 2, 3] → 123`