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I tried to create an environment in the folder quantengine (on my MacOS V.11.3 - Big Sur) by first installing the QuantLib-Python package. It seems to install, but I get the Locking Failed error. Any idea what might be causing this? I installed first pyenv via brew. I set Python 3.9.4 as global. I then installed pipenv via pip.

screenshot zsh shell

CA-Math
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  • Try using `pip install quantlib` first. If that fails, there might be no version of QuantLib on PyPI that works on your Mac. Is it a M1 machine or an older one? – Luigi Ballabio May 21 '21 at 07:57
  • Hello Mr. Ballabio. Thanks for your reply. I 'pip install QuantLib' globally and then in a local subfolder 'pipenv install QuantLib-Python' (as I want to work within an environment using pyenv+pipenv), but unfortunately got the same result. I have an "old" Mac (from 2015). QuantLib-Python does seem to be installed and working in my subfolder, but on installing the package pipenv outputs this "Locking Failed!" message. – CA-Math May 22 '21 at 07:30
  • If the global `pip install QuantLib` worked, it should mean that a compatible wheel for your machine is available. Have you tried `pipenv install QuantLib`? (The QuantLib-Python module was obsoleted a while ago). If that doesn't work, I'm not familiar wih pipenv, but have you tried the suggestions that pipenv wrote to console in your screenshot? – Luigi Ballabio May 22 '21 at 10:55
  • Hello Mr. Ballabio. I tried with `pipenv install QuantLib` and obtained the same result. I tried the first suggestion on the console: "First try clearing your dependency cache with $ pipenv lock --clear, then try the original command again", but that didn't help either. I will try the second option (bypassing the Locking mechanism) and see if then using the `pipenv graph` helps. By the way, from your comment above, I should not use `pip(env) install QuantLib-Python`? Should I stick to only QuantLib? Kind regards. – CA-Math May 23 '21 at 13:57
  • `QuantLib-Python` was the old name. It should cause `QuantLib` (the new name) to be installed as a dependency, but you can install `QuantLib` directly instead. – Luigi Ballabio May 23 '21 at 20:19

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