Python无法打开文件“ No such file or directory” [英] Python can't open file "No such file or directory"

问题描述

def main():
    fh = open('lines.txt')
    for line in fh.readlines():
        print(line)

if __name__ == "__main__": main()

目录文件

我在 for-working.py 文件，并尝试访问同一工作目录中的 lines.txt 文件。但是我得到了错误

I am on for-working.py file, and am trying to access the lines.txt file within the same working directory. But I get error

没有这样的文件或目录：'lines.txt'

No such file or directory: 'lines.txt'

打开文件时python是否需要绝对路径？

Does python need to have an absolute path when opening files?

为什么此相对路径在这里不起作用？

why doesn't this relative path work here?

运行python 3.6

Running python 3.6

编辑^ 1 我正在使用python包运行visualstudio代码Don Jayamanne的扩展名和代码运行器包来编译/执行python代码

EDIT ^1 I'm running visualstudio code with the python package extension by Don Jayamanne, and "Code Runner" package to compile/execute python code

EDIT ^ 2 完整错误：

Traceback (most recent call last):
  File "c:\www\Ex_Files_Python_3_EssT(1)\Ex_Files_Python_3_EssT\Exercise Files\07 Loops\for-working.py", line 11, in <module>
    if __name__ == "__main__": main()
  File "c:\www\Ex_Files_Python_3_EssT(1)\Ex_Files_Python_3_EssT\Exercise Files\07 Loops\for-working.py", line 7, in main
    fh = open('lines.txt', 'r')
FileNotFoundError: [Errno 2] No such file or directory: 'lines.txt'

编辑^ 3 检查sys.path

EDIT ^3 checking sys.path

import sys
print(sys.path)

产生以下信息：

['c:\\www\\Ex_Files_Python_3_EssT(1)\\Ex_Files_Python_3_EssT\\Exercise Files\\07 Loops', 
'C:\\Users\\Kagerjay\\AppData\\Local\\Programs\\Python\\Python36\\python36.zip', 'C:\\Users\\Kagerjay\\AppData\\Local\\Programs\\Python\\Python36\\DLLs', 'C:\\Users\\Kagerjay\\AppData\\Local\\Programs\\Python\\Python36\\lib', 'C:\\Users\\Kagerjay\\AppData\\Local\\Programs\\Python\\Python36', 'C:\\Users\\Kagerjay\\AppData\\Local\\Programs\\Python\\Python36\\lib\\site-packages']

编辑^ 4 检查os.getcwd（）

EDIT ^4 checking os.getcwd()

正在运行

import os
print(os.getcwd())

产生

c:\www\Ex_Files_Python_3_EssT(1)\Ex_Files_Python_3_EssT\Exercise Files

绝对不在正确的子目录中（需要 cd 07循环文件夹，缩小了问题范围

Well its definitely not in the right subdirectory (needs to cd 07 loops folder, that narrows the issue down

编辑^ 5 lines.txt文件中的内容

EDIT ^5 what is in lines.txt file

我正在打开的lines.txt文件如下所示。开头没有多余的空格或任何东西

My lines.txt file i am opening looks like this. No extra whitespace or anything at start

01 This is a line of text
02 This is a line of text
03 This is a line of text
04 This is a line of text
05 This is a line of text

摘要

需要稍微调整Visual Studio代码的代码运行程序扩展名才能在其中打开文件一个子目录，因此以下任何答案都将提供更强大的解决方案，使其独立于IDE的任何扩展/依赖项

Visual studio code's Code runner extension needs to be tweaked slightly to open files within a subdirectory so any of the below answers would provide a more robust solution to be independent of any extension / dependencies with the IDE

import os
print(os.getcwd())

对于诊断问题最有用当前目录python解释器看到

Is most useful for diagnosing problem to the current directory python interpreter sees

推荐答案

获取文件的目录，并将其与要打开的文件连接起来：

Get the directory of the file, and join it with the file you want to open:

def main():
    dir_path = os.path.dirname(os.path.realpath(__file__))
    lines = os.path.join(dir_path, "lines.txt")
    fh = open(lines)
    for line in fh.readlines():
        print(line)

if __name__ == "__main__": main()

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