[Question] Why is the environment variable None?

[robinchiyo]

Question

我想获取这个文件存储的环境目录，但是失败了，并且返回了None

Code sample

setting_path = os.getenv("FLET_APP_STORAGE_DATA")
print(setting_path)
file_path = os.path.join(setting_path, 'ClassData')

Error message

None
Traceback (most recent call last):
  File "E:\pythonPRO\adflet\recall\main.py", line 36, in <module>
    file_path = os.path.join(setting_path, 'ClassData')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen ntpath>", line 108, in join
TypeError: expected str, bytes or os.PathLike object, not NoneType

------------------------------------------------------

• I have searched for answers to my question both in the issues and in previous discussions.

[ndonkoHenri]

How do you run the app and which Flet version do you have?