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Add lark import error (#7465)

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Bagatur 2023-07-10 03:21:23 -04:00 committed by GitHub
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commit 04cddfba0d
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5
langchain/chains/query_constructor/parser.py
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@ -145,6 +145,11 @@ def get_parser(
Returns:
Lark parser for the query language.
"""
# QueryTransformer is None when Lark cannot be imported.
if QueryTransformer is None:
raise ImportError(
"Cannot import lark, please install it with 'pip install lark'."
)
transformer = QueryTransformer(
allowed_comparators=allowed_comparators, allowed_operators=allowed_operators
)