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doc: fix env change method in the environment reference

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Maksim Shabunin 2024-05-13 14:16:31 +03:00
parent 1d9a4120fa
commit 78c9793d5b
1 changed files with 7 additions and 1 deletions
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doc/tutorials/introduction/env_reference/env_reference.markdown
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@ -46,10 +46,16 @@ MY_ENV_VARIABLE=true ./my_app
```.py
import os
os.environ["MY_ENV_VARIABLE"] = True
os.environ["MY_ENV_VARIABLE"] = "True" # value must be a string
import cv2 # variables set after this may not have effect
```
@note This method may not work on all operating systems and/or Python distributions. For example, it works on Ubuntu Linux with system Python interpreter, but doesn't work on Windows 10 with the official Python package. It depends on the ability of a process to change its own environment (OpenCV uses `getenv` from C++ runtime to read variables).
@note See also:
- https://docs.python.org/3.12/library/os.html#os.environ
- https://stackoverflow.com/questions/69199708/setenvironmentvariable-does-not-seem-to-set-values-that-can-be-retrieved-by-ge
## Types