从输入文件中读取并执行减法的正确方法是什么？

Question

我是初学计算思维的程序员，正在做澳大利亚信息学奥林匹克练习题的一些基础题

到目前为止，这是我的代码：

inputfile = open("sitin.txt", "r")
outputfile = open("sitout.txt", "w")

r = 0
s = 0
t = 0
sit = 0
stand = 0
seats_available = 0

#Reading integers from input file

r, s = map(int, inputfile.readline().split())
t = map(int, inputfile.readline().split())

#Conducting the operations

seats_available = r * s

if t > seats_available:
    sit = r*s
    stand = t - seats_available
else: 
    sit = t
    stand = 0


#Writing answer in the output file

outputfile.write(sit + "" + stand + "\n")

outputfile.close()
inputfile.close()

这是我得到的错误：

Traceback (most recent call last):
  line 25, in <module>
    if t > seats_available:
TypeError: '>' not supported between instances of 'map' and 'int'

如有任何帮助，我们将不胜感激！

Answer 1

结果如预期

#example line: "2 3" => r = 2, s = 3
r, s = map(int, inputfile.readline().split())

问题出在这一行：

t = map(int, inputfile.readline().split())
# results t = iterator, it doesn't unpack the result
# this should fix the problem:
t = int(inputfile.readline().split()[0])

或

t,dummy = map(int, inputfile.readline().split())

Answer 2

您应该这样您就不必担心关闭它们。此外，用 0 初始化值是你不必做的事情，所以我也放弃了它。这几件事使您的代码更易于阅读且不易出错。

您收到错误是因为在 t 的行上只有一个值，因此它不会像 r 和 s 那样自动解包。

# Reading integers from input file
with open("sitin.txt", "r") as inputfile:
    r, s = map(int, inputfile.readline().split())
    t = int(inputfile.readline().strip())

#Conducting the operations

seats_available = r * s

if t > seats_available:
    sit = r*s
    stand = t - seats_available
else: 
    sit = t
    stand = 0

#Writing answer in the output file

with open("sitout.txt", "w") as outputfile:
    outputfile.write(f"{sit} {stand}\n")

从输入文件中读取并执行减法的正确方法是什么？

What is the right method to read from input file and perform subtraction?

python

operands