From 0ce4767076aff8f48e6df989425655802f5f6448 Mon Sep 17 00:00:00 2001
From: Philipp Schmid <32632186+philschmid@users.noreply.github.com>
Date: Fri, 31 Mar 2023 18:49:12 +0200
Subject: [PATCH] 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)
---
 langchain/__init__.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/langchain/__init__.py b/langchain/__init__.py
index 86bf4f7a..a03ce602 100644
--- a/langchain/__init__.py
+++ b/langchain/__init__.py
@@ -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()