gistfile1.py

def max_consecutive_sum(nums):
    max_sum = nums[0]
    current_sum = 0

    for i in nums:
        current_sum += i
        if current_sum > max_sum:
            max_sum = current_sum
        if current_sum <= 0:
            current_sum = 0

    return max_sum

if __name__ == '__main__':
    print max_consecutive_sum([-1, 5, -1, -2, 20, -50, 4])