changed ValueError to ImportError (#5103)

# changed ValueError to ImportError

Code cleaning.
Fixed inconsistencies in ImportError handling. Sometimes it raises
ImportError and sometime ValueError.
I've changed all cases to the `raise ImportError`
Also:
- added installation instruction in the error message, where it missed;
- fixed several installation instructions in the error message;
- fixed several error handling in regards to the ImportError

langchain/agents/agent_toolkits/pandas/base.py

@@ -34,7 +34,7 @@ def create_pandas_dataframe_agent(
     try:
         import pandas as pd
     except ImportError:
-        raise ValueError(
+        raise ImportError(
             "pandas package not found, please install with `pip install pandas`"
         )
 

langchain/cache.py

@@ -313,7 +313,7 @@ class GPTCache(BaseCache):
         try:
             import gptcache  # noqa: F401
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import gptcache python package. "
                 "Please install it with `pip install gptcache`."
             )

langchain/chains/moderation.py

@@ -54,7 +54,7 @@ class OpenAIModerationChain(Chain):
                 openai.organization = openai_organization
             values["client"] = openai.Moderation
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import openai python package. "
                 "Please install it with `pip install openai`."
             )

langchain/chat_models/azure_openai.py

@@ -86,7 +86,7 @@ class AzureChatOpenAI(ChatOpenAI):
             if openai_organization:
                 openai.organization = openai_organization
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import openai python package. "
                 "Please install it with `pip install openai`."
             )

langchain/document_loaders/apify_dataset.py

@@ -41,7 +41,7 @@ class ApifyDatasetLoader(BaseLoader, BaseModel):
 
             values["apify_client"] = ApifyClient()
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import apify-client Python package. "
                 "Please install it with `pip install apify-client`."
             )

langchain/document_loaders/docugami.py

@@ -63,7 +63,7 @@ class DocugamiLoader(BaseLoader, BaseModel):
         try:
             from lxml import etree
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import lxml python package. "
                 "Please install it with `pip install lxml`."
             )
@@ -259,7 +259,7 @@ class DocugamiLoader(BaseLoader, BaseModel):
                     try:
                         from lxml import etree
                     except ImportError:
-                        raise ValueError(
+                        raise ImportError(
                             "Could not import lxml python package. "
                             "Please install it with `pip install lxml`."
                         )

langchain/document_loaders/duckdb_loader.py

@@ -33,7 +33,7 @@ class DuckDBLoader(BaseLoader):
         try:
             import duckdb
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import duckdb python package. "
                 "Please install it with `pip install duckdb`."
             )

langchain/document_loaders/image_captions.py

@@ -39,7 +39,7 @@ class ImageCaptionLoader(BaseLoader):
         try:
             from transformers import BlipForConditionalGeneration, BlipProcessor
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "`transformers` package not found, please install with "
                 "`pip install transformers`."
             )
@@ -66,7 +66,7 @@ class ImageCaptionLoader(BaseLoader):
         try:
             from PIL import Image
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "`PIL` package not found, please install with `pip install pillow`"
             )
 

langchain/document_loaders/json_loader.py

@@ -42,7 +42,7 @@ class JSONLoader(BaseLoader):
         try:
             import jq  # noqa:F401
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "jq package not found, please install it with `pip install jq`"
             )
 

langchain/document_loaders/notebook.py

@@ -83,7 +83,7 @@ class NotebookLoader(BaseLoader):
         try:
             import pandas as pd
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "pandas is needed for Notebook Loader, "
                 "please install with `pip install pandas`"
             )

langchain/document_loaders/onedrive.py

@@ -77,7 +77,7 @@ class OneDriveLoader(BaseLoader, BaseModel):
         try:
             from O365 import FileSystemTokenBackend
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "O365 package not found, please install it with `pip install o365`"
             )
         if self.auth_with_token:

langchain/document_loaders/pdf.py

@@ -103,7 +103,7 @@ class PyPDFLoader(BasePDFLoader):
         try:
             import pypdf  # noqa:F401
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "pypdf package not found, please install it with " "`pip install pypdf`"
             )
         self.parser = PyPDFParser()
@@ -194,7 +194,7 @@ class PDFMinerLoader(BasePDFLoader):
         try:
             from pdfminer.high_level import extract_text  # noqa:F401
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "`pdfminer` package not found, please install it with "
                 "`pip install pdfminer.six`"
             )
@@ -222,7 +222,7 @@ class PDFMinerPDFasHTMLLoader(BasePDFLoader):
         try:
             from pdfminer.high_level import extract_text_to_fp  # noqa:F401
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "`pdfminer` package not found, please install it with "
                 "`pip install pdfminer.six`"
             )
@@ -256,7 +256,7 @@ class PyMuPDFLoader(BasePDFLoader):
         try:
             import fitz  # noqa:F401
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "`PyMuPDF` package not found, please install it with "
                 "`pip install pymupdf`"
             )
@@ -375,7 +375,7 @@ class PDFPlumberLoader(BasePDFLoader):
         try:
             import pdfplumber  # noqa:F401
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "pdfplumber package not found, please install it with "
                 "`pip install pdfplumber`"
             )

langchain/document_loaders/readthedocs.py

@@ -19,9 +19,8 @@ class ReadTheDocsLoader(BaseLoader):
         """Initialize path."""
         try:
             from bs4 import BeautifulSoup
-
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import python packages. "
                 "Please install it with `pip install beautifulsoup4`. "
             )

langchain/document_loaders/s3_directory.py

@@ -19,7 +19,7 @@ class S3DirectoryLoader(BaseLoader):
         try:
             import boto3
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import boto3 python package. "
                 "Please install it with `pip install boto3`."
             )

langchain/document_loaders/s3_file.py

@@ -21,7 +21,7 @@ class S3FileLoader(BaseLoader):
         try:
             import boto3
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import `boto3` python package. "
                 "Please install it with `pip install boto3`."
             )

langchain/document_loaders/sitemap.py

@@ -58,7 +58,7 @@ class SitemapLoader(WebBaseLoader):
         try:
             import lxml  # noqa:F401
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "lxml package not found, please install it with " "`pip install lxml`"
             )
 
@@ -107,8 +107,9 @@ class SitemapLoader(WebBaseLoader):
             try:
                 import bs4
             except ImportError:
-                raise ValueError(
-                    "bs4 package not found, please install it with " "`pip install bs4`"
+                raise ImportError(
+                    "beautifulsoup4 package not found, please install it"
+                    " with `pip install beautifulsoup4`"
                 )
             fp = open(self.web_path)
             soup = bs4.BeautifulSoup(fp, "xml")

langchain/document_loaders/srt.py

@@ -13,8 +13,8 @@ class SRTLoader(BaseLoader):
         try:
             import pysrt  # noqa:F401
         except ImportError:
-            raise ValueError(
-                "package `pysrt` not found, please install it with `pysrt`"
+            raise ImportError(
+                "package `pysrt` not found, please install it with `pip install pysrt`"
             )
         self.file_path = file_path
 

langchain/document_loaders/telegram.py

@@ -226,7 +226,7 @@ class TelegramChatApiLoader(BaseLoader):
                 nest_asyncio.apply()
                 asyncio.run(self.fetch_data_from_telegram())
             except ImportError:
-                raise ValueError(
+                raise ImportError(
                     """`nest_asyncio` package not found.
                     please install with `pip install nest_asyncio`
                     """
@@ -239,7 +239,7 @@ class TelegramChatApiLoader(BaseLoader):
         try:
             import pandas as pd
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 """`pandas` package not found. 
                 please install with `pip install pandas`
                 """

langchain/document_loaders/twitter.py

@@ -15,7 +15,7 @@ def _dependable_tweepy_import() -> tweepy:
     try:
         import tweepy
     except ImportError:
-        raise ValueError(
+        raise ImportError(
             "tweepy package not found, please install it with `pip install tweepy`"
         )
     return tweepy

langchain/document_loaders/url_playwright.py

@@ -30,7 +30,7 @@ class PlaywrightURLLoader(BaseLoader):
         try:
             import playwright  # noqa:F401
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "playwright package not found, please install it with "
                 "`pip install playwright`"
             )

langchain/document_loaders/url_selenium.py

@@ -40,7 +40,7 @@ class SeleniumURLLoader(BaseLoader):
         try:
             import selenium  # noqa:F401
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "selenium package not found, please install it with "
                 "`pip install selenium`"
             )
@@ -48,7 +48,7 @@ class SeleniumURLLoader(BaseLoader):
         try:
             import unstructured  # noqa:F401
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "unstructured package not found, please install it with "
                 "`pip install unstructured`"
             )

langchain/embeddings/cohere.py

@@ -48,7 +48,7 @@ class CohereEmbeddings(BaseModel, Embeddings):
 
             values["client"] = cohere.Client(cohere_api_key)
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import cohere python package. "
                 "Please install it with `pip install cohere`."
             )

langchain/embeddings/huggingface.py

@@ -46,7 +46,7 @@ class HuggingFaceEmbeddings(BaseModel, Embeddings):
             import sentence_transformers
 
         except ImportError as exc:
-            raise ValueError(
+            raise ImportError(
                 "Could not import sentence_transformers python package. "
                 "Please install it with `pip install sentence_transformers`."
             ) from exc

langchain/embeddings/jina.py

@@ -34,7 +34,7 @@ class JinaEmbeddings(BaseModel, Embeddings):
         try:
             import jina
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import `jina` python package. "
                 "Please install it with `pip install jina`."
             )

langchain/embeddings/openai.py

@@ -178,7 +178,7 @@ class OpenAIEmbeddings(BaseModel, Embeddings):
                 openai.api_type = openai_api_type
             values["client"] = openai.Embedding
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import openai python package. "
                 "Please install it with `pip install openai`."
             )
@@ -192,67 +192,64 @@ class OpenAIEmbeddings(BaseModel, Embeddings):
         embeddings: List[List[float]] = [[] for _ in range(len(texts))]
         try:
             import tiktoken
-
-            tokens = []
-            indices = []
-            encoding = tiktoken.model.encoding_for_model(self.model)
-            for i, text in enumerate(texts):
-                if self.model.endswith("001"):
-                    # See: https://github.com/openai/openai-python/issues/418#issuecomment-1525939500
-                    # replace newlines, which can negatively affect performance.
-                    text = text.replace("\n", " ")
-                token = encoding.encode(
-                    text,
-                    allowed_special=self.allowed_special,
-                    disallowed_special=self.disallowed_special,
-                )
-                for j in range(0, len(token), self.embedding_ctx_length):
-                    tokens += [token[j : j + self.embedding_ctx_length]]
-                    indices += [i]
-
-            batched_embeddings = []
-            _chunk_size = chunk_size or self.chunk_size
-            for i in range(0, len(tokens), _chunk_size):
-                response = embed_with_retry(
-                    self,
-                    input=tokens[i : i + _chunk_size],
-                    engine=self.deployment,
-                    request_timeout=self.request_timeout,
-                    headers=self.headers,
-                )
-                batched_embeddings += [r["embedding"] for r in response["data"]]
-
-            results: List[List[List[float]]] = [[] for _ in range(len(texts))]
-            num_tokens_in_batch: List[List[int]] = [[] for _ in range(len(texts))]
-            for i in range(len(indices)):
-                results[indices[i]].append(batched_embeddings[i])
-                num_tokens_in_batch[indices[i]].append(len(tokens[i]))
-
-            for i in range(len(texts)):
-                _result = results[i]
-                if len(_result) == 0:
-                    average = embed_with_retry(
-                        self,
-                        input="",
-                        engine=self.deployment,
-                        request_timeout=self.request_timeout,
-                        headers=self.headers,
-                    )["data"][0]["embedding"]
-                else:
-                    average = np.average(
-                        _result, axis=0, weights=num_tokens_in_batch[i]
-                    )
-                embeddings[i] = (average / np.linalg.norm(average)).tolist()
-
-            return embeddings
-
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import tiktoken python package. "
                 "This is needed in order to for OpenAIEmbeddings. "
                 "Please install it with `pip install tiktoken`."
             )
 
+        tokens = []
+        indices = []
+        encoding = tiktoken.model.encoding_for_model(self.model)
+        for i, text in enumerate(texts):
+            if self.model.endswith("001"):
+                # See: https://github.com/openai/openai-python/issues/418#issuecomment-1525939500
+                # replace newlines, which can negatively affect performance.
+                text = text.replace("\n", " ")
+            token = encoding.encode(
+                text,
+                allowed_special=self.allowed_special,
+                disallowed_special=self.disallowed_special,
+            )
+            for j in range(0, len(token), self.embedding_ctx_length):
+                tokens += [token[j : j + self.embedding_ctx_length]]
+                indices += [i]
+
+        batched_embeddings = []
+        _chunk_size = chunk_size or self.chunk_size
+        for i in range(0, len(tokens), _chunk_size):
+            response = embed_with_retry(
+                self,
+                input=tokens[i : i + _chunk_size],
+                engine=self.deployment,
+                request_timeout=self.request_timeout,
+                headers=self.headers,
+            )
+            batched_embeddings += [r["embedding"] for r in response["data"]]
+
+        results: List[List[List[float]]] = [[] for _ in range(len(texts))]
+        num_tokens_in_batch: List[List[int]] = [[] for _ in range(len(texts))]
+        for i in range(len(indices)):
+            results[indices[i]].append(batched_embeddings[i])
+            num_tokens_in_batch[indices[i]].append(len(tokens[i]))
+
+        for i in range(len(texts)):
+            _result = results[i]
+            if len(_result) == 0:
+                average = embed_with_retry(
+                    self,
+                    input="",
+                    engine=self.deployment,
+                    request_timeout=self.request_timeout,
+                    headers=self.headers,
+                )["data"][0]["embedding"]
+            else:
+                average = np.average(_result, axis=0, weights=num_tokens_in_batch[i])
+            embeddings[i] = (average / np.linalg.norm(average)).tolist()
+
+        return embeddings
+
     def _embedding_func(self, text: str, *, engine: str) -> List[float]:
         """Call out to OpenAI's embedding endpoint."""
         # handle large input text

langchain/embeddings/tensorflow_hub.py

@@ -30,13 +30,20 @@ class TensorflowHubEmbeddings(BaseModel, Embeddings):
         super().__init__(**kwargs)
         try:
             import tensorflow_hub
+        except ImportError:
+            raise ImportError(
+                "Could not import tensorflow-hub python package. "
+                "Please install it with `pip install tensorflow-hub``."
+            )
+        try:
             import tensorflow_text  # noqa
+        except ImportError:
+            raise ImportError(
+                "Could not import tensorflow_text python package. "
+                "Please install it with `pip install tensorflow_text``."
+            )
 
-            self.embed = tensorflow_hub.load(self.model_url)
-        except ImportError as e:
-            raise ValueError(
-                "Could not import some python packages." "Please install them."
-            ) from e
+        self.embed = tensorflow_hub.load(self.model_url)
 
     class Config:
         """Configuration for this pydantic object."""

langchain/graphs/networkx_graph.py

@@ -54,7 +54,7 @@ class NetworkxEntityGraph:
         try:
             import networkx as nx
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import networkx python package. "
                 "Please install it with `pip install networkx`."
             )
@@ -70,7 +70,7 @@ class NetworkxEntityGraph:
         try:
             import networkx as nx
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import networkx python package. "
                 "Please install it with `pip install networkx`."
             )

langchain/llms/aleph_alpha.py

@@ -148,7 +148,7 @@ class AlephAlpha(LLM):
 
             values["client"] = aleph_alpha_client.Client(token=aleph_alpha_api_key)
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import aleph_alpha_client python package. "
                 "Please install it with `pip install aleph_alpha_client`."
             )

langchain/llms/anthropic.py

@@ -59,7 +59,7 @@ class _AnthropicCommon(BaseModel):
             values["AI_PROMPT"] = anthropic.AI_PROMPT
             values["count_tokens"] = anthropic.count_tokens
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import anthropic python package. "
                 "Please it install it with `pip install anthropic`."
             )

langchain/llms/bananadev.py

@@ -91,7 +91,7 @@ class Banana(LLM):
         try:
             import banana_dev as banana
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import banana-dev python package. "
                 "Please install it with `pip install banana-dev`."
             )

langchain/llms/cohere.py

@@ -72,7 +72,7 @@ class Cohere(LLM):
 
             values["client"] = cohere.Client(cohere_api_key)
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import cohere python package. "
                 "Please install it with `pip install cohere`."
             )

langchain/llms/google_palm.py

@@ -29,7 +29,10 @@ def _create_retry_decorator() -> Callable[[Any], Any]:
     try:
         import google.api_core.exceptions
     except ImportError:
-        raise ImportError()
+        raise ImportError(
+            "Could not import google-api-core python package. "
+            "Please install it with `pip install google-api-core`."
+        )
 
     multiplier = 2
     min_seconds = 1
@@ -105,7 +108,10 @@ class GooglePalm(BaseLLM, BaseModel):
 
             genai.configure(api_key=google_api_key)
         except ImportError:
-            raise ImportError("Could not import google.generativeai python package.")
+            raise ImportError(
+                "Could not import google-generativeai python package. "
+                "Please install it with `pip install google-generativeai`."
+            )
 
         values["client"] = genai
 

langchain/llms/gooseai.py

@@ -100,7 +100,7 @@ class GooseAI(LLM):
             openai.api_base = "https://api.goose.ai/v1"
             values["client"] = openai.Completion
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import openai python package. "
                 "Please install it with `pip install openai`."
             )

langchain/llms/huggingface_text_gen_inference.py

@@ -97,7 +97,7 @@ class HuggingFaceTextGenInference(LLM):
                 values["inference_server_url"], timeout=values["timeout"]
             )
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import text_generation python package. "
                 "Please install it with `pip install text_generation`."
             )

langchain/llms/nlpcloud.py

@@ -75,7 +75,7 @@ class NLPCloud(LLM):
                 values["model_name"], nlpcloud_api_key, gpu=True, lang="en"
             )
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import nlpcloud python package. "
                 "Please install it with `pip install nlpcloud`."
             )

langchain/llms/openai.py

@@ -234,7 +234,7 @@ class BaseOpenAI(BaseLLM):
                 openai.organization = openai_organization
             values["client"] = openai.Completion
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import openai python package. "
                 "Please install it with `pip install openai`."
             )
@@ -462,7 +462,7 @@ class BaseOpenAI(BaseLLM):
         try:
             import tiktoken
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import tiktoken python package. "
                 "This is needed in order to calculate get_num_tokens. "
                 "Please install it with `pip install tiktoken`."
@@ -677,7 +677,7 @@ class OpenAIChat(BaseLLM):
             if openai_organization:
                 openai.organization = openai_organization
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import openai python package. "
                 "Please install it with `pip install openai`."
             )
@@ -807,7 +807,7 @@ class OpenAIChat(BaseLLM):
         try:
             import tiktoken
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import tiktoken python package. "
                 "This is needed in order to calculate get_num_tokens. "
                 "Please install it with `pip install tiktoken`."

langchain/llms/predictionguard.py

@@ -50,7 +50,7 @@ class PredictionGuard(LLM):
 
             values["client"] = pg.Client(token=token)
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import predictionguard python package. "
                 "Please install it with `pip install predictionguard`."
             )

langchain/llms/replicate.py

@@ -89,7 +89,7 @@ class Replicate(LLM):
         try:
             import replicate as replicate_python
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import replicate python package. "
                 "Please install it with `pip install replicate`."
             )

langchain/llms/rwkv.py

@@ -103,7 +103,7 @@ class RWKV(LLM, BaseModel):
         try:
             import tokenizers
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import tokenizers python package. "
                 "Please install it with `pip install tokenizers`."
             )

langchain/llms/sagemaker_endpoint.py

@@ -182,7 +182,7 @@ class SagemakerEndpoint(LLM):
                 ) from e
 
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import boto3 python package. "
                 "Please install it with `pip install boto3`."
             )

langchain/llms/self_hosted.py

@@ -155,7 +155,7 @@ class SelfHostedPipeline(LLM):
             import runhouse as rh
 
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import runhouse python package. "
                 "Please install it with `pip install runhouse`."
             )

langchain/memory/chat_message_histories/firestore.py

@@ -52,13 +52,11 @@ class FirestoreChatMessageHistory(BaseChatMessageHistory):
         try:
             import firebase_admin
             from firebase_admin import firestore
-        except ImportError as e:
-            logger.error(
-                "Failed to import Firebase and Firestore: %s. "
-                "Make sure to install the 'firebase-admin' module.",
-                e,
+        except ImportError:
+            raise ImportError(
+                "Could not import firebase-admin python package. "
+                "Please install it with `pip install firebase-admin`."
             )
-            raise e
 
         # For multiple instances, only initialize the app once.
         try:

langchain/memory/chat_message_histories/redis.py

@@ -25,7 +25,7 @@ class RedisChatMessageHistory(BaseChatMessageHistory):
         try:
             import redis
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import redis python package. "
                 "Please install it with `pip install redis`."
             )

langchain/memory/entity.py

@@ -91,7 +91,7 @@ class RedisEntityStore(BaseEntityStore):
         try:
             import redis
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import redis python package. "
                 "Please install it with `pip install redis`."
             )

langchain/retrievers/document_compressors/cohere_rerank.py

@@ -41,7 +41,7 @@ class CohereRerank(BaseDocumentCompressor):
 
             values["client"] = cohere.Client(cohere_api_key)
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import cohere python package. "
                 "Please install it with `pip install cohere`."
             )

langchain/retrievers/weaviate_hybrid_search.py

@@ -23,7 +23,7 @@ class WeaviateHybridSearchRetriever(BaseRetriever):
         try:
             import weaviate
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import weaviate python package. "
                 "Please install it with `pip install weaviate-client`."
             )

langchain/text_splitter.py

@@ -154,7 +154,7 @@ class TextSplitter(BaseDocumentTransformer, ABC):
         try:
             import tiktoken
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import tiktoken python package. "
                 "This is needed in order to calculate max_tokens_for_prompt. "
                 "Please install it with `pip install tiktoken`."
@@ -232,7 +232,7 @@ class TokenTextSplitter(TextSplitter):
         try:
             import tiktoken
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import tiktoken python package. "
                 "This is needed in order to for TokenTextSplitter. "
                 "Please install it with `pip install tiktoken`."

langchain/utilities/awslambda.py

@@ -35,7 +35,7 @@ class LambdaWrapper(BaseModel):
 
         except ImportError:
             raise ImportError(
-                "boto3 is not installed." "Please install it with `pip install boto3`"
+                "boto3 is not installed. Please install it with `pip install boto3`"
             )
 
         values["lambda_client"] = boto3.client("lambda")

langchain/utilities/google_places_api.py

@@ -51,8 +51,8 @@ class GooglePlacesAPIWrapper(BaseModel):
 
             values["google_map_client"] = googlemaps.Client(gplaces_api_key)
         except ImportError:
-            raise ValueError(
-                "Could not import googlemaps python packge. "
+            raise ImportError(
+                "Could not import googlemaps python package. "
                 "Please install it with `pip install googlemaps`."
             )
         return values

langchain/utilities/jira.py

@@ -156,7 +156,7 @@ class JiraAPIWrapper(BaseModel):
             import json
         except ImportError:
             raise ImportError(
-                "json is not installed. " "Please install it with `pip install json`"
+                "json is not installed. Please install it with `pip install json`"
             )
         params = json.loads(query)
         return self.jira.issue_create(fields=dict(params))

langchain/utilities/openweathermap.py

@@ -38,7 +38,7 @@ class OpenWeatherMapAPIWrapper(BaseModel):
 
         except ImportError:
             raise ImportError(
-                "pyowm is not installed. " "Please install it with `pip install pyowm`"
+                "pyowm is not installed. Please install it with `pip install pyowm`"
             )
 
         owm = pyowm.OWM(openweathermap_api_key)