Question

这是我到目前为止，我正在创建一个程序，要求用户输入7个数字。这些数字可以是任何数字。最终结果将给出正数，负数和所有数字的平均值如下：

average positive="" 
average negative="" 
average all=""


import random

def main():
        sum_positive=0 
        count_positive=0 # number of positive 
        sum_negative=0 
        count_negative=0 # number of negative 

    for i in range (7): 
        n=input("Please, enter number %d: " % i) # will display prompt like "Please, enter         number 1:" 
        print ("number entered: ",n) # this will print the entered number, one of the question 
        if n > 0: 
           count_positive += 1 
           sum_positive = sum_positive + n 
        elif n < 0: 
           count_negative += 1 
           sum_negative = sum_negative + n 
    # loop ends here 
    print("Sum of negative number is :", sum_negative) 
    print("Average negative number is : ", sum_negative*1.0/count_negative) 
    print("Sum of positive number is :", sum_positive) 
    print("Average positive number is : ", sum_positive*1.0/count_positive)



main()

Answer 1

有点整洁＆amp;更多pythonic代码。

numbers = [input("Please, enter number {}: ".format(i+1)) for i in range(7)]
# will display prompt like "Please, enter number 1:"
print "numbers entered:", numbers # this will print the entered numbers

positives = [num for num in numbers if num >= 0]
negatives = [num for num in numbers if num  < 0]

# loop ends here
print "Sum of negative numbers is :", sum(negatives)
print "Average negative number is :", sum(negatives)*1.0/len(negatives)
print "Sum of positive numbers is :", sum(positives)
print "Average positive number is :", sum(positives)*1.0/len(positives)

List Comprehensions比普通for循环更快＆amp;更像是pythonic。

sum是一个内置函数，它返回所提供的iterables中整数/浮点数的总和。

len是一个内置函数，它返回列表的长度或传递给它的iterable。

注意 - 在Python v3中print是一个函数。此外，input的行为与raw_input相似，因此要将整数作为输入，您应该int(input())。

Answer 2

你可以这样做。

user_input = []
for i in range(7):
    user_input.append(input("Pleace, enter number %d: " % i))

negs = [x for x in user_input if x < 0]
pos  = [x for x in user_input if x > 0]

print "Sum of neg ", sum(negs)
print "Avg of neg ", sum(negs)/float(len(negs))

print "Sum of pos ", sum(pos)
print "Avg of pos ", sum(pos)/float(len(negs))

print "Sum of all ", sum(user_input)
print "Avg of all ", sum(user_input)/float(len(user_input))

产生负数和正数之和的Python程序？

2 个答案: