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The main reason I use Poetry is for its lockfile support. I've written about why lockfiles are good here: https://myers.io/2019/01/13/what-is-the-purpose-of-a-l

• gjvc 6y ago
  What does this do/have over files generated by "pip freeze" ?
• westurner 6y ago
  Pip supports constraints files. https://pip.pypa.io/en/stable/user_guide/#constraints-files https://pip.pypa.io/en/stable/user_guide/#constraints-files : > Constraints files are requirements files that only control which version of a requirement is installed, not whether it is installed or not. Their syntax and contents is nearly identical to Requirements Files. There is one key difference: Including a package in a constraints file does not trigger installation of the package. > Use a constraints file like so: python -m pip install -c constraints.txt
  • jshen 6y ago
    What does that command do? Does it install dependencies, or simply verify the versions of the installed dependencies?
    • ptx 6y ago
      It just gives you an error: ERROR: You must give at least one requirement to install (see "pip help install") So it seems like a strange choice of usage example. You have to provide both requirements and constraints for it to do anything useful (applying the version constraints to the requirements and their dependencies).