Integer Stack Overflow: Integer overflow if (abs(num) > (2 ** 31 - 1)): return False Data Conversion int -> string num_str = str(10) num_str.__str__(10) int -> float list -> int Stack Overflow: list to int nums = [1, 2, 3] magic = lambda nums: int(''.join(str(i) for i in nums)) num = magic(nums)