为什么Python的sum（）和min（）内置函数要好得多？

Question

Why the built-in functions of sum() and min() are much better than the simple implementation (comment out in the following) ? How do they improve the performance?

class Solution(object):
def minMoves(self, nums):
    """
    :type nums: List[int]
    :rtype: int
    """
    '''
    m = sys.maxint
    s = 0
    for i in nums:
        s += i
        if i < m:
            m = i
    '''
    m = min(nums)
    s = sum(nums)
    return s - m * len(nums)

Answer 1

As Tigerhawk mentioned in the comments, most built-in functions were written in C, as can be seen here . I believe what we're looking for starts at line 591 :

_sum(PyObject *module, PyObject *args)
{
    PyObject *return_value = NULL;
    PyObject *iterable;
    PyObject *start = NULL;

    if (!PyArg_UnpackTuple(args, "sum",
        1, 2,
        &iterable, &start)) {
        goto exit;
    }
    return_value = builtin_sum_impl(module, iterable, start);

exit:
    return return_value;
}