Python 中使用 os.getenv() 获取环境变量为空的原因及解决方法

"import os\n"dd = os.getenv("EXECL_FOLDER")\n"print(dd)\n"设置了EXECL_FOLDER为什么输出dd的值为空"There could be several reasons why the value of `dd` is empty even though you have set the `EXECL_FOLDER` environment variable. Here are a few possibilities:\n\n1. The `EXECL_FOLDER` environment variable is not set correctly or is not set at all. You can check if the variable is set correctly by printing its value before running the script.\n\n2. The script is running in a different environment or shell session where the `EXECL_FOLDER` environment variable is not available. Environment variables are usually specific to a particular session or process.\n\n3. The script is running with different permissions or privileges that do not have access to the `EXECL_FOLDER` environment variable. Make sure the script is being executed with the necessary permissions to access and retrieve the value of the environment variable.\n\n4. There might be a typo or mistake in the code or environment variable name. Double-check the spelling and case sensitivity of the variable name in both the code and the environment variable definition.\n\nTo further debug the issue, you can try printing all the environment variables using `os.environ` and check if `EXECL_FOLDER` is listed there. Additionally, you can try accessing the environment variable directly without using `os.getenv()` by using `os.environ["EXECL_FOLDER"]` and see if it gives you the expected value.