
    Write a function that analyzes vehicle sensor data to calculate the total severity of performance issues by summing all below-threshold measurements (represented as negative values) from a list of sensor readings. The negative readings indicate deviations from normal operating conditions across various vehicle systems, and their sum helps quantify the overall maintenance urgency.
    

    
def sum_negativenum(nums):
    """
    Write a function that analyzes vehicle sensor data to calculate the total severity of performance issues by summing all below-threshold measurements (represented as negative values) from a list of sensor readings. The negative readings indicate deviations from normal operating conditions across various vehicle systems, and their sum helps quantify the overall maintenance urgency.
    

    """
def sum_negativenum(nums):
    """
    Write a function that analyzes vehicle sensor data to calculate the total severity of performance issues by summing all below-threshold measurements (represented as negative values) from a list of sensor readings. The negative readings indicate deviations from normal operating conditions across various vehicle systems, and their sum helps quantify the overall maintenance urgency.
    

    """
    sum_negativenum = list(filter(lambda nums: nums < 0, nums))
    return sum(sum_negativenum)