hooks: update hooks and test for langchain >= 1.0.0

In `langchain` v1.0.0, the API has changed completely.

The old interfaces are available in optional `langchain_classic`
package, for which we need to collect data files (same as we had to
for `langchain` for `langchain` < 1.0.0).

Put the old test under version check, and create a counterpart for
`langchain_classic`.

In addition, try to set up a basic test for the new `langchain` itself;
since this requires access to an LLM model, have the test use `ollama`,
and exit if it cannot connect to the local instance. This way, we can
at least check on the CI that everything works up until the point
where access to the model is required (and locally, it is possible
to run complete test by running a docker container with the model).

Author: rokm

.github/workflows/pr-test.yml

@@ -173,6 +173,9 @@ jobs:
           # Install additional intake plugins for test_intake_plugins
           pip show -qq intake && pip install --prefer-binary intake-xarray
 
+          # test_langchain_with_ollama requires langchain-ollama to be installed together with langchain
+          pip show -qq langchain && pip install --prefer-binary langchain-ollama
+
           # Install PyInstaller
           pip install ${{ matrix.pyinstaller }}
 

_pyinstaller_hooks_contrib/stdhooks/hook-langchain.py

@@ -12,4 +12,6 @@
 
 from PyInstaller.utils.hooks import collect_data_files
 
+# This was required with langchain < 1.0.0; in contemporary versions, the package does not contain any data files,
+# so this should be effectively a no-op.
 datas = collect_data_files('langchain')

_pyinstaller_hooks_contrib/stdhooks/hook-langchain_classic.py

@@ -0,0 +1,15 @@
+# ------------------------------------------------------------------
+# Copyright (c) 2025 PyInstaller Development Team.
+#
+# This file is distributed under the terms of the GNU General Public
+# License (version 2.0 or later).
+#
+# The full license is available in LICENSE, distributed with
+# this software.
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+# ------------------------------------------------------------------
+
+from PyInstaller.utils.hooks import collect_data_files
+
+datas = collect_data_files('langchain_classic')

news/960.update.rst

@@ -0,0 +1 @@
+Update ``langchain`` hooks for ``langchain`` v.1.0.x.

requirements-test-libraries.txt

@@ -236,8 +236,8 @@ eth-rlp==2.2.0
 z3c.rml==5.0.1; python_version >= "3.9"
 freetype-py==2.5.1
 vaderSentiment==3.3.2
-# At time of writing, the type annotations used by lanchain do not seem to be compatible with python 3.14.
-langchain==0.3.27; python_version >= "3.9" and python_version < "3.14"
+langchain==1.0.2; python_version >= "3.10"
+langchain-classic==1.0.2; python_version >= "3.10"
 seedir==0.5.1
 # Starting with v0.4.0, cel-python depends on google-re2, which does not provide binary wheels for python 3.14.
 cel-python==0.4.0; python_version >= "3.9" and python_version < "3.14"

tests/test_libraries.py

@@ -1961,13 +1961,54 @@ def test_vadersentiment(pyi_builder):
     """)
 
 
-@importorskip('langchain')
+@requires('langchain < 1.0')
 def test_langchain_llm_summarization_checker(pyi_builder):
     pyi_builder.test_source("""
         import langchain.chains.llm_summarization_checker.base
     """)
 
 
+# In langchain 1.0.0, the old API was moved into langchain-classic package.
+@requires('langchain-classic >= 1.0')
+def test_langchain_classic_llm_summarization_checker(pyi_builder):
+    pyi_builder.test_source("""
+        import langchain_classic.chains.llm_summarization_checker.base
+    """)
+
+
+@requires('langchain >= 1.0')
+@requires('langchain-ollama')
+def test_langchain_with_ollama(pyi_builder):
+    pyi_builder.test_source("""
+        import time
+        from langchain.chat_models import init_chat_model
+
+        model = init_chat_model("ollama:gemma3:1b")  # requires langchain-ollama
+
+        try:
+            start_time = time.time()
+            response = model.invoke("What is LangChain?")
+            elapsed = time.time() - start_time
+            print(f"Answer took {elapsed:.1f} seconds:")
+        except Exception as e:
+            # Gracefully handle the situation where local instance of ollama is not running - this should be the usual case with
+            # this test running on PyInstaller's CI.
+            #
+            # If you want to set up a local instance for complete test, see:
+            # https://github.com/ollama/ollama?tab=readme-ov-file#ollama
+            if "Connection refused" in str(e):
+                print("Local instance of ollama does not seem to be running.")
+                raise SystemExit(0)
+            raise
+
+        for block in response.content_blocks:
+            if block["type"] == "reasoning":
+                print(block.get("reasoning"))
+            elif block["type"] == "text":
+                print(block.get("text"))
+    """)
+
+
 @importorskip('seedir')
 def test_seedir(pyi_builder):
     pyi_builder.test_source("""