title: Dependency version syntax for Python Poetry
body: <p>The <a href="https://github.com/sdispater/poetry" rel="noreferrer">Poetry</a> project is a dependency management system for Python. It uses the new <a href="https://www.python.org/dev/peps/pep-0518/" rel="noreferrer">pyproject.toml</a> file as its config file. </p>
  
  <p>The Poetry tools supports a few different ways of specifying the allowed versions of your dependencies. What is the syntax of the version specifier for Poetry dependencies?</p>