Question

从文件中读取时出现此错误：

line 70 in main: score += points
TypeError: unsupported operand type(s) for +=: 'int' and 'str'

我在文件中取一个整数并将其添加到变量score。文件读取在next_line函数中完成，然后在next_block函数中调用。

我尝试将score和points转换为一个似乎不起作用的整数。

这是程序代码：

# Trivia Challenge
# Trivia game that reads a plain text file

import sys

def open_file(file_name, mode):
    """Open a file."""
    try:
        the_file = open(file_name, mode)
    except IOError as e:
        print("Unable to open the file", file_name, "Ending program.\n",e)
        input("\n\nPress the enter key to exit.")
        sys.exit()
    else:
        return the_file

def next_line(the_file):
    """Return next line from the trivia file, formatted."""
    line = the_file.readline()
    line = line.replace("/", "\n")
    return line

def next_block(the_file):
    """Return the next block of data from the trivia file."""
    category = next_line(the_file)

    question = next_line(the_file)

    answers = []
    for i in range(4):
        answers.append(next_line(the_file))

    correct = next_line(the_file)
    if correct:
        correct = correct[0]

    explanation = next_line(the_file)

    points = next_line(the_file)

    return category, question, answers, correct, explanation, points

def welcome(title):
    """Welcome the player and get his/her name."""
    print("\t\tWelcome to Trivia Challenge!\n")
    print("\t\t", title, "\n")

def main():
    trivia_file = open_file("trivia.txt", "r")
    title = next_line(trivia_file)
    welcome(title)
    score = 0

    # get first block
    category, question, answers, correct, explanation, points = next_block(trivia_file)
    while category:
        # ask a question
        print(category)
        print(question)
        for i in range(4):
            print("\t", i + 1, "-", answers[i])

        # get answer
        answer = input("What's your answer?: ")

        # check answer
        if answer == correct:
            print("\nRight!", end= " ")
            score += points
        else:
            print("\nWrong.", end= " ")
        print(explanation)
        print("Score:", score, "\n\n")

        # get next block
        category, question, answers, correct, explanation, points = next_block(trivia_file)

    trivia_file.close()

    print("That was the last question!")
    print("Your final score is", score)

main()
input("\n\nPress the enter key to exit.")

Answer 1

points是一个字符串，因为您是从文件中读取的：

points = next_line(the_file)

但score是一个整数：

score = 0

您无法将字符串添加到整数。如果从文件中读取的值表示整数，则需要先使用int()进行转换：

score += int(points)

Answer 2

当收到错误消息时，它通常可以显示有关问题的有用信息......
TypeError: unsupported operand type(s) for +=: 'int' and 'str'基本上是说人们不能使用+=运算符（可以简化为+）并使用它接收的两种不同类型的对象（字符串和整数，你的情况）您的points对象的类型为整数，而score是一个字符串（因为它是从文件中读取的）。

要更正此问题，必须将字符串转换为整数，允许您将其与另一个整数相加，这可以使用int()函数来完成。

tl; dr：type(1)！= type('1')

Answer 3

您正尝试添加int和str

score = int(score)
score += points

TypeError：+ =：'int'和'str'的不支持的操作数类型

3 个答案: