我无法从文件的父目录简单导入python3模块。我可以让模块导入从父目录运行,而不会出现问题 直到 我在要导入的文件中引入了一个文件描述符。

下面的示例1是一个“运行良好”的场景,2是我希望得到建议的问题场景。

#1-工作正常

应用程序目录结构:

├── app
│   └── app.py
├── config.py

文件内容:

# app.py
import sys
sys.path.insert(0, '../')
from config import Config as conf

foo = conf.foo

if __name__ == '__main__':
    print('hello from app main')
    print(f'foo is --> {foo}')


#config.py
class Config():
    foo = 'bar'

$ pwd
app/
$ python app.py
hello from app main
foo is --> bar

#2-不工作/失败

├── app
│   └── app.py
├── config.py
└── foo.txt <-- **Introduced new file here**

文件内容:

# app.py
import sys
sys.path.insert(0, '../')
from config import Config as conf

foo = conf.foo

if __name__ == '__main__':
    print('hello from app main')
    print(f'foo is --> {foo}')

# config.py
class Config():
    with open('foo.txt', 'rt') as f:
        foo = f.readline().rstrip()   

# foo.txt
bar

运行它:

$ pwd
app/

$ python app.py
Traceback (most recent call last):
  File "app.py", line 3, in <module>
    from config import Config as conf
  File "../config.py", line 1, in <module>
    class Config():
  File "../config.py", line 2, in Config
    with open('foo.txt', 'rt') as f:
FileNotFoundError: [Errno 2] No such file or directory: 'foo.txt'

我在这里做错什么了?请注意foo.txt 做 实际上存在于父目录中,尽管有“FileNotFoundError”错误消息。

$ cat ../foo.txt
bar