Feature Request: Exception or Warning on Duplicate Configuration Items

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難度
5/5
預估耗時
一週以上
新手友好度
35/100
Issue 類型
功能
描述清晰度
基本清楚
活躍度
停滯
技術堆疊
python
領域
devops

研究方向

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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