试图打开一个.txt文件，但不断得到错误消息

Question

这是我打开文件的代码；我希望它包含一个名称和一个数字：

file_n = "Class_" + str(num_class) + ".txt"
file = open(file_n,"r")
string = file.read()
file.close()

这是我一直收到的错误信息，我无法解决它：

file = open(file_n,"r")

IOError: [Errno 2] No such file or directory: 'Class_2.txt'

有人能告诉我为什么会发生这种情况和解决办法吗？ 我还是很困惑 这是我的全部密码：

import random

import json

score = 0

turn = 1

turn = turn + 1

name = raw_input("what is your name?")

num_class = input("What class are you in? (1,2,3)")

print ("hello "+name+" have fun and good luck!")

for turn in range(10):


    randnum_1 = random.randint(1,10)
    randnum_2 = random.randint(1,10)
    operators = ["+", "-", "*"]
    operator_picked = operators[random.randint(0,2)]
    human_answer = raw_input("What is " + str(randnum_1) +" "+ operator_picked +" " + str(randnum_2) + "?")
    correct_answer = str((eval(str(randnum_1) + operator_picked + str(randnum_2))))


    if correct_answer == human_answer :
        score = score+1
        print ("Correct!")

    else:
        print ("Incorrect!" +"The correct answer is " + str(correct_answer))


print("\nYour score was " + str(score)+ "/10")


file_name = ("Class_" + str(num_class) + ".txt")

file = open(file_n,"r")

string = file.read()

file.close()

dict = {}

Answer 1

确保Python代码与txt文件位于同一目录中。

所以应该是这样的：

当然，这两个文件可以位于不同的目录中，但是您应该为您的代码提供txt文件的相关或绝对路径。你知道吗

---

如1001010所述，您可以通过执行以下操作来检查当前目录：

import os
print(os.getcwd()) 

Answer 2

就像Kevin和Flavian提到的那样，Class_2.txt的目录很可能不是脚本所在的目录。你知道吗

file_n = "/ActualDirectory/ofFile/Class_" + str(num_class) + ".txt"