Question

我正在努力使程序向前或向后计数，具体取决于start_number是小于还是大于end_number。当start_number较小时它可以工作，但如果它更大，它就不会工作。知道为什么？谢谢！

#Challenge 4.1
#Asks the user for a beginning and ending number, then asks for the amount count by. The      program then prints the numbers 


start_number = int(input("What number would you like me to begin with?"))
end_number = int(input("What number would you like me to end with?"))
count_number = int(input("How much would you like me to count by? " +
                     "(Note: for most accurate results have me count by a number " +
                     "that divides evenly into the number you assigned me to end with.)"))








print("\ncalculating...\n")

if start_number < end_number:
   end_number += count_number
   for number in range (start_number, end_number, count_number):
      print(number)

elif end_number < start_number:
   count_number *= -1
   for number in range (end_number, start_number, count_number):
      pyprint(number)

Answer 1

你错误地推翻了范围的args。有了这个固定的，＆＃39; pyprint＆＃39;将是一个NameError。你也忽略了调整停止计数。尝试上下两个。

start = int(input("What number would you like me to begin with?"))
stop = int(input("What number would you like me to end with?"))
step = int(input("How much would you like me to count by?"))

if stop < start:
    step *= -1
stop += step

for number in range (start, stop, step):
      print(number)

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