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After install python packages 'Brotli' and 'zopfli' are not in 'Requires' list of 'weasyprint' package #1568

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@mPyth

Description

Problem is observed in two distinct virtual environments (one based on python 3.7 and another one on python 3.10), with older and the newest pip (v22.0.3), with the newest version of weasyprint (v54.1).

It is simple to reproduce by using command pip show weasyprint or pipdeptree (that command needs previous install of the same name python package).

Here is example of running pipdeptree in my environment:

(vEnvDjango32) c:\pyth\virtEnvs>pipdeptree
Brotli==1.0.9
cx-Oracle==8.3.0
Django==3.2
  - asgiref [required: >=3.3.2,<4, installed: 3.5.0]
    - typing-extensions [required: Any, installed: 4.0.1]
  - pytz [required: Any, installed: 2021.3]
  - sqlparse [required: >=0.2.2, installed: 0.4.2]
openpyxl==3.0.9
  - et-xmlfile [required: Any, installed: 1.1.0]
pendulum==2.1.2
  - python-dateutil [required: >=2.6,<3.0, installed: 2.8.2]
    - six [required: >=1.5, installed: 1.16.0]
  - pytzdata [required: >=2020.1, installed: 2020.1]
pipdeptree==2.2.1
  - pip [required: >=6.0.0, installed: 20.1.1]
psycopg2-binary==2.9.3
schedule==1.1.0
setuptools==47.1.0
weasyprint==54.1
  - cffi [required: >=0.6, installed: 1.15.0]
    - pycparser [required: Any, installed: 2.21]
  - cssselect2 [required: >=0.1, installed: 0.4.1]
    - tinycss2 [required: Any, installed: 1.1.1]
      - webencodings [required: >=0.4, installed: 0.5.1]
    - webencodings [required: Any, installed: 0.5.1]
  - fonttools [required: >=4.0.0, installed: 4.29.1]
  - html5lib [required: >=1.1, installed: 1.1]
    - six [required: >=1.9, installed: 1.16.0]
    - webencodings [required: Any, installed: 0.5.1]
  - Pillow [required: >=4.0.0, installed: 9.0.1]
  - pydyf [required: >=0.0.3, installed: 0.1.2]
  - Pyphen [required: >=0.9.1, installed: 0.12.0]
  - tinycss2 [required: >=1.0.0, installed: 1.1.1]
    - webencodings [required: >=0.4, installed: 0.5.1]
zopfli==0.1.9

After install of weasyprint two packages (Brotli and zopfli) are shown in 'root' layer of installed packages which is not expected (they should be indented inside weasyprint section). All other packages from this example have correct dependencies.
Command pip show weasyprint confirms this - in line Requires there is no those two packages.

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