johnnydep

Johnnydep

Pretty-print a dependency tree for a Python distribution. A simple example:

$ johnnydep requests
name                       summary
-------------------------  ----------------------------------------------------------------------
requests                   Python HTTP for Humans.
├── certifi>=2017.4.17     Python package for providing Mozilla's CA Bundle.
├── chardet<3.1.0,>=3.0.2  Universal encoding detector for Python 2 and 3
├── idna<2.8,>=2.5         Internationalized Domain Names in Applications (IDNA)
└── urllib3<1.24,>=1.21.1  HTTP library with thread-safe connection pooling, file post, and more.

A more complex tree:

$ johnnydep boto3
name                                     summary
---------------------------------------  -------------------------------------------------
boto3                                    The AWS SDK for Python
├── botocore<1.11.0,>=1.10.77            Low-level, data-driven core of boto 3.
│   ├── docutils>=0.10                   Docutils -- Python Documentation Utilities
│   ├── jmespath<1.0.0,>=0.7.1           JSON Matching Expressions
│   └── python-dateutil<3.0.0,>=2.1      Extensions to the standard Python datetime module
│       └── six>=1.5                     Python 2 and 3 compatibility utilities
├── jmespath<1.0.0,>=0.7.1               JSON Matching Expressions
└── s3transfer<0.2.0,>=0.1.10            An Amazon S3 Transfer Manager
    └── botocore<2.0.0,>=1.3.0           Low-level, data-driven core of boto 3.
        ├── docutils>=0.10               Docutils -- Python Documentation Utilities
        ├── jmespath<1.0.0,>=0.7.1       JSON Matching Expressions
        └── python-dateutil<3.0.0,>=2.1  Extensions to the standard Python datetime module
            └── six>=1.5                 Python 2 and 3 compatibility utilities

Johnnydep can also attempt to resolve the dependency tree:

$ johnnydep ipython --output-format pinned
ipython==6.5.0
appnope==0.1.0
backcall==0.1.0
decorator==4.3.0
jedi==0.12.1
pexpect==4.6.0
pickleshare==0.7.4
prompt-toolkit==1.0.15
pygments==2.2.0
setuptools==40.0.0
simplegeneric==0.8.1
traitlets==4.3.2
parso==0.3.1
ptyprocess==0.6.0
six==1.11.0
wcwidth==0.1.7
ipython-genutils==0.2.0

Note that pip install lacked a working solver for many years, but pip v20.3 has a new solver (December 2020) which has really improved matters!

Check johnnydep --help for other features and options.

Helpful links

• Core metadata specifications
• PEP 427 -- The Wheel Binary Package Format 1.0
• PEP 426 -- Metadata for Python Software Packages 2.0 (now revoked but still commonly seen in the wild)
• PEP 566 -- Metadata for Python Software Packages 2.1
• PEP 503 -- Simple Repository API