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mbchang d3bdb8ea6d FileCallbackHandler (#5589) ... # like [StdoutCallbackHandler](https://github.com/hwchase17/langchain/blob/master/langchain/callbacks/stdout.py), but writes to a file When running experiments I have found myself wanting to log the outputs of my chains in a more lightweight way than using WandB tracing. This PR contributes a callback handler that writes to file what `StdoutCallbackHandler` would print. <!-- Thank you for contributing to LangChain! Your PR will appear in our release under the title you set. Please make sure it highlights your valuable contribution. Replace this with a description of the change, the issue it fixes (if applicable), and relevant context. List any dependencies required for this change. After you're done, someone will review your PR. They may suggest improvements. If no one reviews your PR within a few days, feel free to @-mention the same people again, as notifications can get lost. Finally, we'd love to show appreciation for your contribution - if you'd like us to shout you out on Twitter, please also include your handle! --> ## Example Notebook <!-- If you're adding a new integration, please include: 1. a test for the integration - favor unit tests that does not rely on network access. 2. an example notebook showing its use See contribution guidelines for more information on how to write tests, lint etc: https://github.com/hwchase17/langchain/blob/master/.github/CONTRIBUTING.md --> See the included `filecallbackhandler.ipynb` notebook for usage. Would it be better to include this notebook under `modules/callbacks` or under `integrations/`?  ## Who can review? Community members can review the PR once tests pass. Tag maintainers/contributors who might be interested: @agola11 <!-- For a quicker response, figure out the right person to tag with @ @hwchase17 - project lead Tracing / Callbacks - @agola11 Async - @agola11 DataLoaders - @eyurtsev Models - @hwchase17 - @agola11 Agents / Tools / Toolkits - @vowelparrot VectorStores / Retrievers / Memory - @dev2049 -->		1 year ago
..
_static	docs: Big Mendable Improvements (#4964)	1 year ago
additional_resources	docs: `Deployments` page moved into `Ecosystem/` (#4949)	1 year ago
ecosystem	Add Chainlit to deployment options (#5314)	1 year ago
getting_started	added DeepLearing.AI course link (#5518)	1 year ago
integrations	docs `ecosystem/integrations` update 4 (#5590)	1 year ago
modules	FileCallbackHandler (#5589)	1 year ago
reference	Documentation fixes (linting and broken links) (#5563)	1 year ago
templates	docs `ecosystem/integrations` update 3 (#5470)	1 year ago
tracing	py tracer fixes (#5377)	1 year ago
use_cases	minor refactor GenerativeAgentMemory (#5315)	1 year ago
Makefile	Feature: linkcheck-action (#534) (#542)	2 years ago
conf.py	docs: Mendable Search integration (#2803)	1 year ago
dependents.md	docs: added `ecosystem/dependents` page (#4941)	1 year ago
index.rst	docs: `Deployments` page moved into `Ecosystem/` (#4949)	1 year ago
integrations.rst	docs: `ecosystem/integrations` update 1 (#5219)	1 year ago
make.bat	initial commit	2 years ago
reference.rst	docs: `Deployments` page moved into `Ecosystem/` (#4949)	1 year ago
requirements.txt	Harrison/docs reqs (#2199)	1 year ago