lowest-higest

def lowestHighest(students):
    lowest = students[0]
    highest = students[len(students)-1]
    for i in range(len(students)):
        if lowest > students[i]:
            lowest = students[i]
        if highest < students[i]:
            highest  = students[i]
        if highest < lowest:
            highest, lowest = lowest, highest
    return lowest, highest


lowest = 0
highest = 0

students = [10, 3, 6 , 7, 9, 5, 4]
lowest, highest = lowestHighest(students)
print(f"lowest: {lowest}, highest: {highest}")