zulip/requirements/README.md

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The dependency graph of the requirements is as follows:
```
dev prod
+ + +
| +->common<-+
v
mypy,docs
```
Of the files, only dev, prod, and mypy have been used in the install
scripts directly. The rest are implicit dependencies.
Steps to update a lock file, e.g. to update ipython from 5.3.0 to latest version:
0. Remove entries for `ipython==5.4.1` in dev.txt and prod.txt.
1. Run `./tools/update-locked-requirements`, which will generate new entries, pinned to the latest version.
2. Increase `PROVISION_VERSION` in `version.py`.
3. Run `./tools/provision` to install the new deps and test them.
4. Commit your changes.