mirror of https://github.com/hwchase17/langchain
Add `__version__` (#2221)
# What does this PR do? This PR adds the `__version__` variable in the main `__init__.py` to easily retrieve the version, e.g., for debugging purposes or when a user wants to open an issue and provide information. Usage ```python >>> import langchain >>> langchain.__version__ '0.0.127' ``` ![Bildschirmfoto 2023-03-31 um 10 30 18](https://user-images.githubusercontent.com/32632186/229068621-53d068b5-32f4-4154-ad2c-a3e1cc7e1ef3.png)pull/2239/head
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