在 Python 中对列表进行计数、相加和求平均值

Question

Ten numbers are to be read in from the keyboard. After this write how many of these numbers were positive, the total of these positive numbers, and the mean (average) of the positive numbers.

This is what I have so far

print ("Input 10 numbers, separated by commas")

k=[x for x in input("Enter number:").split(',')]

for l in k:
    print (l)
    if l > 0:
        print("positive")
    else:
        print("negative")

However I have no idea where to go and any help would be much appreciated!

Answer 1

You can define two variables positive_total and positive_count to keep track, while going through the list

print ("Input 10 numbers, separated by commas")

k=[x for x in input("Enter number:").split(',')]

positive_total = 0 #total of all positive integers
positive_count = 0 #keeps count of number of positive integers
for l in k:
    print (l)
    if l > 0:
        positive_total += l
        positive_count += 1
        print("positive")
    else:
        print("negative")

print('Count of positive integers = {}'.format(positive_count))
print('Total of positive integers = {}'.format(positive_total))
print('Average of positive integers = {}'.format(positive_total/positive_count))

Answer 2

This should be an adequate solution:

num_list = []

for i in range(10):
    num = input("Enter number:")
    num_list.append(int(num))

positives = 0
pos_nums = []

for num in num_list:
    if num > 0:
        positives += 1
        pos_nums.append(num)

pos_sum = sum(pos_nums)

print(positives)
print(pos_sum)
print(pos_sum/positives)