python展平数组的数组

def flatten_array(arr):
    result = []
    for i in arr:
        if isinstance(i, list):
            result.extend(flatten_array(i))
        else:
            result.append(i)
    return result

def flatten_array(arr):
    result = []
    stack = [arr]
    while stack:
        curr = stack.pop()
        if isinstance(curr, list):
            stack.extend(curr)
        else:
            result.append(curr)
    return result