Do not raise exception for pipenv graph when virtualenv does not exist #3201
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Description
Issue description
When virutaulenv is not created for a project yet, pipenv graph
will raise exception.
➜ pipenv graph
Traceback (most recent call last):
File "/usr/local/bin/pipenv", line 11, in <module>
load_entry_point('pipenv', 'console_scripts', 'pipenv')()
File "/home/user/Documents/dev/pipenv/pipenv/vendor/click/core.py", line 764, in __call__
return self.main(*args, **kwargs)
File "/home/user/Documents/dev/pipenv/pipenv/vendor/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/home/user/Documents/dev/pipenv/pipenv/vendor/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/home/user/Documents/dev/pipenv/pipenv/vendor/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/home/user/Documents/dev/pipenv/pipenv/vendor/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/home/user/Documents/dev/pipenv/pipenv/cli/command.py", line 538, in graph
do_graph(bare=bare, json=json, json_tree=json_tree, reverse=reverse)
File "/home/user/Documents/dev/pipenv/pipenv/core.py", line 2430, in do_graph
python_path = which("python")
File "/home/user/Documents/dev/pipenv/pipenv/core.py", line 110, in which
raise RuntimeError("location not created nor specified")
RuntimeError: location not created nor specified
It happens at least for v2018.10.13.
Expected result
It should be a friendly info.
➜ pipenv graph
Warning: No virtualenv has been created for this project yet! Consider running `pipenv install` first to automatically generate one for you or see`pipenv install --help` for further instructions.
Please run $ pipenv --support
, and paste the results here. Don't put backticks (`
) around it! The output already contains Markdown formatting.
If you're on macOS, run the following:
$ pipenv --support | pbcopy
If you're on Windows, run the following:
> pipenv --support | clip
If you're on Linux, run the following:
$ pipenv --support | xclip
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