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Add __version__ (#2221)

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# 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)
This commit is contained in:
Philipp Schmid 2023-03-31 18:49:12 +02:00 committed by GitHub
parent 6c66f51fb8
commit 0ce4767076
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langchain/__init__.py
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@ -1,5 +1,6 @@
"""Main entrypoint into package."""
from importlib import metadata
from typing import Optional
from langchain.agents import MRKLChain, ReActChain, SelfAskWithSearchChain
@ -53,6 +54,9 @@ from langchain.utilities.wikipedia import WikipediaAPIWrapper
from langchain.utilities.wolfram_alpha import WolframAlphaAPIWrapper
from langchain.vectorstores import FAISS, ElasticVectorSearch
__version__ = metadata.version(__package__)
del metadata # optional, avoids polluting the results of dir(__package__)
verbose: bool = False
llm_cache: Optional[BaseCache] = None
set_default_callback_manager()