Feature Request: Exception or Warning on Duplicate Configuration Items
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调研方向
Start by tracing how py-dotenv handles repeated keys while loading a .env file and review the proposed behavior options. Done should be defined by an agreed API and semantics for warning, strict, latter-covers, and any custom merge logic.
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描述
Currently, py-dotenv uses a strategy of overwriting with the latter value when handling configuration items with the same key, that is, using the last value of the repeated key. However, I just wasted an entire morning because there were three configuration items with the same key in my .env file. 😢
To avoid others encountering similar issues, I propose adding an optional behavior parameter. The default should be warning, meaning the latter value overwrites the former but with a warning. It could also be set to strict, which throws an exception, or to latter-covers, which means the latter value overwrites the former without any warning.
I have researched how other libraries handle this issue, for reference:
| Parser | Duplicate Handling | Notes |
|---|---|---|
| Node.js dotenv | Latter covers | Most common mode |
| Python dotenv | Latter covers | Configurable to override system variables |
| PHP phpdotenv | Default error | Can be set to allow overrides |
| Ruby dotenv | Latter covers | Issues a warning |
| Go godotenv | Latter covers | No warning |
| Docker Compose | Latter covers | Follows file loading order |
Append: maybe a Callable[[list[str]], str] like sum is also acceptable, for #374 suggests a customed merge logic.
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