'save-exact' option for saving exact version in Pipfile

I’ve looked through the docs and the cli, but cannot seem to find a way to save the version of the installed package explicitly without editing the Pipfile after installing a package.

Example: pipenv install scipy would add scipy = "*" to the Pipfile.

I would have expected a way to have scipy = "==1.2.0" to the Pipfile instead.

I was wondering if this sort of functionality already exists and/or if there is any reason not to go this route.

This would be similar to running npm install react --save-exact, where the installed version is added to the package.json file.

Apologies in advance if this is not the right forum/format for this question. I had tried looking through the docs, Stackoverflow, and search engines without luck.

[Demetri0]

I think that it should be by default behavior. I’m totally don’t mean any version when I install something, but I mean the latest on the current moment(moment when I use pipenv install smth). And I wish bugfixes to be applicable so it should be not == but ~=

[matteius]

pipenv sync installs the versions from the lock file, and pipenv install re-lock with the Pipfile specifiers and then installs that updated lock file.