Fix the DeprecationWarning with Python 3.9.

python -Wd -c "import colour"

gives a number of warnings:

.../opt/pyenv/versions/3.9.10/lib/python3.9/site-packages/colour/utilities/data_structures.py:34: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.10 it will stop working
  from collections import Mapping, MutableMapping
.../opt/pyenv/versions/3.9.10/lib/python3.9/site-packages/colour/continuous/signal.py:26: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.10 it will stop working
  from collections import Iterator, Mapping, Sequence
.../opt/pyenv/versions/3.9.10/lib/python3.9/site-packages/colour/utilities/common.py:613: DeprecationWarning: `np.complex` is a deprecated alias for the builtin `complex`. To silence this warning, use `complex` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.complex128` here.
Deprecated in NumPy 1.20; for more details and guidance: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations
  [float, complex, np.integer, np.floating, np.complex]))
.../opt/pyenv/versions/3.9.10/lib/python3.9/site-packages/colour/io/luts/lut.py:21: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.10 it will stop working
  from collections import MutableSequence
.../opt/pyenv/versions/3.9.10/lib/python3.9/site-packages/colour/volume/rgb.py:186: DeprecationWarning: `np.float` is a deprecated alias for the builtin `float`. To silence this warning, use `float` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.float64` here.
Deprecated in NumPy 1.20; for more details and guidance: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations
  limits=np.array([[0, 100], [-150, 150], [-150, 150]], dtype=np.float),
.../opt/pyenv/versions/3.9.10/lib/python3.9/site-packages/colour/utilities/common.py:613: DeprecationWarning: `np.complex` is a deprecated alias for the builtin `complex`. To silence this warning, use `complex` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.complex128` here.
Deprecated in NumPy 1.20; for more details and guidance: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations
  [float, complex, np.integer, np.floating, np.complex]))
.../opt/pyenv/versions/3.9.10/lib/python3.9/site-packages/colour/utilities/common.py:613: DeprecationWarning: `np.complex` is a deprecated alias for the builtin `complex`. To silence this warning, use `complex` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.complex128` here.
Deprecated in NumPy 1.20; for more details and guidance: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations
  [float, complex, np.integer, np.floating, np.complex]))

Related: https://github.com/colour-science/colour/issues/543

[KelSolaar]

Ah! 😃 Sorry about that! I actually forgot that I fixed some more in the feature/typing branch which should be merged imminently, this one has none:

(colour-49B8_mty-py3.9) Eris:colour kelsolaar$ git status
On branch feature/typing
Your branch is up to date with 'upstream/feature/typing'.

nothing to commit, working tree clean
(colour-49B8_mty-py3.9) Eris:colour kelsolaar$ python -Wd -c "import colour"
(colour-49B8_mty-py3.9) Eris:colour kelsolaar$ 

[bersbersbers]

@KelSolaar you are (mostly) right! I had tried pip install git+https://github.com/colour-science/colour (installing from master), but develop actually has fewer warnings. But in fact, it still has some:

pip uninstall colour-science
python -Wd -c "import colour"
pip install git+https://github.com/colour-science/colour@develop
python -Wd -c "import colour"

Output:

...
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'colour'
...
  Resolved https://github.com/colour-science/colour to commit 38782ac059e8ddd91939f3432bf06811c16667f0
...
Successfully built colour
Installing collected packages: colour
Successfully installed colour-0.3.16
...

.../opt/pyenv/versions/3.9.10/lib/python3.9/site-packages/colour/utilities/common.py:961: DeprecationWarning: `np.complex` is a deprecated alias for the builtin `complex`. To silence this warning, use `complex` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.complex128` here.
Deprecated in NumPy 1.20; for more details and guidance: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations
  a, (int, float, complex, np.integer, np.floating, np.complex))
.../opt/pyenv/versions/3.9.10/lib/python3.9/site-packages/colour/volume/rgb.py:192: DeprecationWarning: `np.float` is a deprecated alias for the builtin `float`. To silence this warning, use `float` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.float64` here.
Deprecated in NumPy 1.20; for more details and guidance: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations
  limits=np.array([[0, 100], [-150, 150], [-150, 150]], dtype=np.float),
.../opt/pyenv/versions/3.9.10/lib/python3.9/site-packages/colour/utilities/common.py:961: DeprecationWarning: `np.complex` is a deprecated alias for the builtin `complex`. To silence this warning, use `complex` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.complex128` here.
Deprecated in NumPy 1.20; for more details and guidance: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations
  a, (int, float, complex, np.integer, np.floating, np.complex))
.../opt/pyenv/versions/3.9.10/lib/python3.9/site-packages/colour/utilities/common.py:961: DeprecationWarning: `np.complex` is a deprecated alias for the builtin `complex`. To silence this warning, use `complex` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.complex128` here.
Deprecated in NumPy 1.20; for more details and guidance: https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations
  a, (int, float, complex, np.integer, np.floating, np.complex))