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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
..
agents	Harrison/pubmed integration (#5664)	1 year ago
callbacks	FileCallbackHandler (#5589)	1 year ago
chains	Fixed multi input prompt for MapReduceChain (#4979)	1 year ago
indexes	Created fix for 5475 (#5659)	1 year ago
memory	fix: correct momento chat history notebook typo and title (#5646)	1 year ago
models	Harrison/update azure nb (#5665)	1 year ago
prompts	docs: `modules` pages simplified (#5116)	1 year ago
utils/examples	Pass parsed inputs through to tool _run (#4309)	1 year ago
agents.rst	docs: `modules` pages simplified (#5116)	1 year ago
chains.rst	docs: `modules` pages simplified (#5116)	1 year ago
indexes.rst	docs: `modules` pages simplified (#5116)	1 year ago
memory.rst	docs: `modules` pages simplified (#5116)	1 year ago
models.rst	docs: `modules` pages simplified (#5116)	1 year ago
paul_graham_essay.txt	Fix notebook example (#3142)	1 year ago
prompts.rst	docs: `modules` pages simplified (#5116)	1 year ago
state_of_the_union.txt	Docs refactor (#480)	2 years ago