$ poetry show --tree --no-dev  # 1.1.4
pytest 6.1.1 pytest: simple powerful testing with Python
├── atomicwrites >=1.0
├── attrs >=17.4.0
├── colorama *
├── iniconfig *
├── packaging *
│   ├── pyparsing >=2.0.2
│   └── six *
├── pluggy >=0.12,<1.0
├── py >=1.8.2
└── toml *
xarray 0.16.1 N-D labeled arrays and datasets in Python
├── numpy >=1.15
└── pandas >=0.25
    ├── numpy >=1.15.4
    ├── python-dateutil >=2.7.3
    │   └── six >=1.5
    └── pytz >=2017.2

$ ~/.bin/poetry show --tree --no-dev  # git version from this PR
xarray 0.16.1 N-D labeled arrays and datasets in Python
├── numpy >=1.15
└── pandas >=0.25
    ├── numpy >=1.15.4
    ├── python-dateutil >=2.7.3
    │   └── six >=1.5
    └── pytz >=2017.2