Question

我是python的新手，并且已经在这个问题上挣扎了很长一段时间了。我不明白为什么我的代码会产生此错误消息并突然停止：

Traceback (most recent call last):
File "C:/...some path../Random_marks.py", line 70, in <module>
total_marks = int(total)
ValueError: invalid literal for int() with base 10: 'A\n'

据我所知，它永远不会出现在我的代码的第66行（标有下面的注释）的if语句中。但我不明白为什么以及如何解决这个问题？变量total仅为字符串类型，因此isalpha()应返回True。但是当我打印它时，出于某种原因它会显示False。

这是enitre代码，但问题只出现在底部的while循环中。

from random import *

infile = open("Compb12-81test1.txt", "r")
outfile = open("Compb12-81test1_marks.txt", "w")

def alldone(done):
    for i in done:
        if i == 0:
            return False
    return True

def assign2m(marks,done,total):
    extra = randint(0,5)
    done[extra] = 1
    while not alldone(done[0:6]):
        mark = randint(0,2)
        select = randint(0,5)
        if total - mark >= 0 and done[select] == 0 and select != extra:
            total -= mark
            marks[select] = mark
            done[select] = 1
    return total

def assign5m(marks,done,total):
    extra1 = randint(6,7)
    extra2 = randint(8,9)
    done[extra1] = 1
    done[extra2] = 1
    while not alldone(done[6:10]):
        mark = randint(0,5)
        select = randint(6,9)
        if total - mark >= 0 and done[select] == 0 and select != extra1 and select != extra2:
            total -= mark
            marks[select] = mark
            done[select] = 1
    return total

def adjust(marks,total,questions):
    for i in range(questions):
        if total > 0:
            if i < 6 and str(marks[i]).isdigit():
                diff = 2 - marks[i]
                if total - diff >= 0:
                    marks[i] = 2
                    total -= diff
                else:
                    marks[i] += total
                    total = 0
            elif i < 10 and str(marks[i]).isdigit():
                diff = 5 - marks[i]
                if total - diff >= 0:
                    marks[i] = 5
                    total -= diff
                else:
                    marks[i] += total
                    total = 0
        else:
            break

questions = 10

total = str(infile.readline())
while total != '-1':
    marks = [" "] * questions
    done = [0] * questions
    if total.isalpha():  # This is line 66
        outfile.write("A," * (questions - 1))
        outfile.write("A" + "\n")
    else:
        total_marks = int(total)
        total = assign2m(marks,done,int(total))
        if int(total) > 0:
            total = assign5m(marks,done,int(total))
        if int(total) > 0:
            adjust(marks,int(total),questions)
    total = str(infile.readline())
    print(marks,total_marks)
    print(total, type(total))

infile.close()
outfile.close()

这是我输入的txt文件内容：

读取字符'A'时会出现问题。

Answer 1

isalpha检查字符串的每个字符是否都是字母。由于您的字符串包含换行符\n，total.isalpha()会返回False。您可以使用

删除空白

total = str(infile.readline()).strip()

需要解释为什么我的代码会产生ValueError

1 个答案: