From 2d91a7bdb12e9dc3009ef415b30fc5ee55458571 Mon Sep 17 00:00:00 2001
From: Tammo Ippen <tammo.ippen@posteo.de>
Date: Thu, 1 Dec 2022 10:45:50 +0100
Subject: [PATCH] Drop python 2.7 support (#52)

---
 .github/workflows/CI.yml      |  34 +-
 .github/workflows/Publish.yml |   8 +-
 .gitignore                    |   1 -
 Makefile                      |   3 +-
 README.md                     |   8 +-
 plotille/_canvas.py           |   4 +-
 plotille/_colors.py           |  16 +-
 plotille/_dots.py             |  10 +-
 plotille/_figure.py           |   2 -
 plotille/_figure_data.py      |   7 +-
 plotille/_input_formatter.py  |  18 +-
 plotille/_util.py             |   8 +-
 plotille/data.py              |  10 +-
 poetry.lock                   | 763 ++++++++++++++++++++++++++++++++++
 pyproject.toml                |  66 +--
 tests/requirements.txt        |   1 -
 tests/test_canvas.py          |  89 ++--
 tests/test_dots.py            |  40 +-
 tests/test_figure_data.py     |   2 +-
 19 files changed, 898 insertions(+), 192 deletions(-)
 create mode 100644 poetry.lock
 delete mode 100644 tests/requirements.txt

diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index de715a3..ee07075 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['pypy-2.7', 2.7, 3.6, 'pypy-3.7', 3.7, 'pypy-3.8', 3.8, 3.9] #, '3.10']
+        python-version: [3.7, 'pypy-3.8', 3.8, 'pypy-3.9', 3.9, '3.10', '3.11']
         include:
         - os: ubuntu-latest
           path: ~/.cache/pip
@@ -23,34 +23,33 @@ jobs:
         - os: windows-latest
           path: ~\AppData\Local\pip\Cache
         exclude:
-        - os: macos-latest
-          python-version: 'pypy-2.7'
-        - os: macos-latest
-          python-version: 'pypy-3.7'
         - os: macos-latest
           python-version: 'pypy-3.8'
-        - os: windows-latest
-          python-version: 'pypy-2.7'
-        - os: windows-latest
-          python-version: 'pypy-3.7'
+        - os: macos-latest
+          python-version: 'pypy-3.9'
         - os: windows-latest
           python-version: 'pypy-3.8'
+        - os: windows-latest
+          python-version: 'pypy-3.9'
+    defaults:
+      run:
+        shell: bash
 
     runs-on: ${{ matrix.os }}
     env:
       PYTHONIOENCODING: UTF-8
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set Up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
 
       - name: Cache Install
         id: restore-cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: |
             ${{ matrix.path }}
@@ -60,21 +59,20 @@ jobs:
       - name: Install Poetry
         uses: snok/install-poetry@v1
         with:
-          version: 1.1.12
+          version: 1.2.2
           virtualenvs-create: false
-      - run: poetry config experimental.new-installer false
 
       - name: Install
-        run: make install
+        run: poetry install
 
       - name: Style
         if: ${{ ! startsWith(matrix.python-version, 'pypy-') }}
-        run: make style
+        run: poetry run flake8 tests/ plotille/ examples/
 
       - name: Tests
-        run: make tests
+        run: poetry run pytest -s -vvv
 
-      - uses: codecov/codecov-action@v2
+      - uses: codecov/codecov-action@v3
         with:
           flags: unittests
           name: coverage-${{ matrix.os }}-${{ matrix.python-version }}
diff --git a/.github/workflows/Publish.yml b/.github/workflows/Publish.yml
index a74de0e..5010206 100644
--- a/.github/workflows/Publish.yml
+++ b/.github/workflows/Publish.yml
@@ -13,23 +13,23 @@ jobs:
 
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set Up Python 3.7
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: 3.7
 
       - name: Install Poetry
         uses: snok/install-poetry@v1
         with:
-          version: 1.1.12
+          version: 1.2.2
 
       - name: Build
         run: poetry build -vvv -f sdist
 
       - name: Archive artifacts
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           path: dist/*.tar.gz
 
diff --git a/.gitignore b/.gitignore
index 2015f69..f66f345 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,7 +15,6 @@ __pycache__/
 dist/
 README.rst
 .pytest_cache/
-poetry.lock
 Pipfile.lock
 cov_html/
 coverage.xml
diff --git a/Makefile b/Makefile
index 27acc4b..c5fb306 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-.PHONY: style tests
+.PHONY: style tests install
 
 style:
 	poetry run flake8 tests/ plotille/ examples/
@@ -8,4 +8,3 @@ tests:
 
 install:
 	poetry install
-	poetry run pip install -r tests/requirements.txt
diff --git a/README.md b/README.md
index d9c88a7..8d2933c 100644
--- a/README.md
+++ b/README.md
@@ -5,13 +5,13 @@
 [![CI](https://github.com/tammoippen/plotille/actions/workflows/CI.yml/badge.svg)](https://github.com/tammoippen/plotille/actions/workflows/CI.yml)
 [![codecov](https://codecov.io/gh/tammoippen/plotille/branch/master/graph/badge.svg?token=OGWI832JNM)](https://codecov.io/gh/tammoippen/plotille)
 [![Language grade: Python](https://img.shields.io/lgtm/grade/python/g/tammoippen/plotille.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/tammoippen/plotille/context:python)
-[![Tested CPython Versions](https://img.shields.io/badge/cpython-2.7%2C%203.6%2C%203.7%2C%203.8%2C%203.9-brightgreen.svg)](https://img.shields.io/badge/cpython-2.7%2C%203.6%2C%203.7%2C%203.8%2C%203.8-brightgreen.svg)
-[![Tested PyPy Versions](https://img.shields.io/badge/pypy-2.7--7.3%2C%203.7--7.3%2C%203.8--7.3-brightgreen.svg)](https://img.shields.io/badge/pypy-2.7--7.3%2C%203.7--7.3%2C%203.8--7.3-brightgreen.svg)
+[![Tested CPython Versions](https://img.shields.io/badge/cpython-3.7%2C%203.8%2C%203.9%2C%203.10%2C%203.11-brightgreen.svg)](https://img.shields.io/badge/cpython-3.7%2C%203.8%2C%203.9%2C%203.10%2C%203.11-brightgreen.svg)
+[![Tested PyPy Versions](https://img.shields.io/badge/pypy-3.8%2C%203.9-brightgreen.svg)](https://img.shields.io/badge/pypy-3.8%2C%203.9-brightgreen.svg)
 [![PyPi version](https://img.shields.io/pypi/v/plotille.svg)](https://pypi.python.org/pypi/plotille)
 [![Downloads](https://pepy.tech/badge/plotille/month)](https://pepy.tech/project/plotille)
 [![PyPi license](https://img.shields.io/pypi/l/plotille.svg)](https://pypi.python.org/pypi/plotille)
 
-Plots, scatter plots, histograms and heatmaps in the terminal using braille dots, and foreground and background colors - with (almost) no dependancies. Make complex figures using the Figure class or make fast and simple plots using graphing function - similar to a very small sibling to matplotlib. Or use the canvas to plot dots, lines and images yourself.
+Plots, scatter plots, histograms and heatmaps in the terminal using braille dots, and foreground and background colors - with no dependancies. Make complex figures using the Figure class or make fast and simple plots using graphing function - similar to a very small sibling to matplotlib. Or use the canvas to plot dots, lines and images yourself.
 
 Install:
 
@@ -30,6 +30,8 @@ Basic support for timeseries plotting is provided with release 3.2: for any `X`
 
 Support for heatmaps using background colors for figures and displaying images binary with braille, or in color with background colors using the canvas - provided with release 4.0
 
+If you are still using python 2.7, please use plotille v4 or before. With v5 I am dropping support for python 2.7, as the effort to maintain the discontinued version is too much.
+
 ## Documentation
 
 ```python
diff --git a/plotille/_canvas.py b/plotille/_canvas.py
index 908a271..e020e6a 100644
--- a/plotille/_canvas.py
+++ b/plotille/_canvas.py
@@ -25,8 +25,6 @@
 
 import os
 
-import six
-
 from ._colors import rgb2byte
 from ._dots import Dots
 from ._util import roundeven
@@ -374,5 +372,5 @@ def plot(self, linesep=os.linesep):
             unicode: The canvas as a string.
         """
 
-        return linesep.join(''.join(map(six.text_type, row))
+        return linesep.join(''.join(map(str, row))
                             for row in reversed(self._canvas))
diff --git a/plotille/_colors.py b/plotille/_colors.py
index 0cfafdf..c28709c 100644
--- a/plotille/_colors.py
+++ b/plotille/_colors.py
@@ -27,8 +27,6 @@
 import os
 import sys
 
-import six
-
 
 def color(text, fg=None, bg=None, mode='names', no_color=False, full_reset=True):  # noqa: C901 complex (12)
     """Surround `text` with control characters for coloring
@@ -109,9 +107,9 @@ def color(text, fg=None, bg=None, mode='names', no_color=False, full_reset=True)
     elif mode == 'byte':
         start = _byte(fg, bg)
     elif mode == 'rgb':
-        if isinstance(fg, six.string_types):
+        if isinstance(fg, str):
             fg = _hex2rgb(fg)
-        if isinstance(bg, six.string_types):
+        if isinstance(bg, str):
             bg = _hex2rgb(bg)
 
         start = _rgb(fg, bg)
@@ -215,17 +213,17 @@ def _byte(fg, bg):
 
     fg_ = ''
     if fg is not None:
-        fg_ = '38;5;' + six.text_type(fg)
+        fg_ = '38;5;' + str(fg)
     bg_ = ''
     if bg is not None:
-        bg_ = '48;5;' + six.text_type(bg)
+        bg_ = '48;5;' + str(bg)
 
     return _join_codes(fg_, bg_)
 
 
 def _hex2rgb(h):
     """Transform rgb hex representation into rgb tuple of ints representation"""
-    assert isinstance(h, six.string_types)
+    assert isinstance(h, str)
     if h.lower().startswith('0x'):
         h = h[2:]
     if len(h) == 3:
@@ -248,10 +246,10 @@ def _rgb(fg, bg):
 
     fg_ = ''
     if fg is not None:
-        fg_ = '38;2;' + ';'.join(map(six.text_type, fg))
+        fg_ = '38;2;' + ';'.join(map(str, fg))
     bg_ = ''
     if bg is not None:
-        bg_ = '48;2;' + ';'.join(map(six.text_type, bg))
+        bg_ = '48;2;' + ';'.join(map(str, bg))
 
     return _join_codes(fg_, bg_)
 
diff --git a/plotille/_dots.py b/plotille/_dots.py
index 90b55d1..beb7d84 100644
--- a/plotille/_dots.py
+++ b/plotille/_dots.py
@@ -23,8 +23,6 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
 
-import six
-
 from ._colors import color
 
 # I plot upside down, hence the different order
@@ -99,7 +97,7 @@ def marker(self):
 
     @marker.setter
     def marker(self, value):
-        assert value is None or isinstance(value, six.string_types)
+        assert value is None or isinstance(value, str)
         assert value is None or len(value) == 1
         self._marker = value
 
@@ -113,7 +111,7 @@ def __str__(self):
         if self.marker:
             res = self.marker
         else:
-            res = six.unichr(0x2800 + self._dots)
+            res = chr(0x2800 + self._dots)
 
         return color(res, fg=self.fg, bg=self.bg, **self.color_kwargs)
 
@@ -161,7 +159,7 @@ def braille_from(dots):
 
     code = 0x2800 + int(''.join(bin_code), 2)
 
-    return six.unichr(code)
+    return chr(code)
 
 
 def dots_from(braille):
@@ -178,7 +176,7 @@ def dots_from(braille):
     """
     assert 0x2800 <= ord(braille) <= 0x28ff
 
-    code = six.text_type(bin(ord(braille) - 0x2800))[2:].rjust(8, '0')
+    code = str(bin(ord(braille) - 0x2800))[2:].rjust(8, '0')
 
     dots = []
     for i, c in enumerate(code):
diff --git a/plotille/_figure.py b/plotille/_figure.py
index 2485079..ee1fc9b 100644
--- a/plotille/_figure.py
+++ b/plotille/_figure.py
@@ -27,8 +27,6 @@
 from itertools import cycle
 import os
 
-from six.moves import zip
-
 from ._canvas import Canvas
 from ._colors import color, rgb2byte
 from ._figure_data import Heat, Histogram, Plot, Span, Text
diff --git a/plotille/_figure_data.py b/plotille/_figure_data.py
index 1ca7c20..4e584d3 100644
--- a/plotille/_figure_data.py
+++ b/plotille/_figure_data.py
@@ -23,9 +23,6 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
 
-import six
-from six.moves import zip
-
 from . import _cmaps
 from ._util import hist
 
@@ -186,7 +183,7 @@ def __init__(self, X, cmap=None):
             for RGB data.
         """
         assert len(X)
-        assert cmap is None or isinstance(cmap, six.string_types) or isinstance(cmap, _cmaps.Colormap)
+        assert cmap is None or isinstance(cmap, (str, _cmaps.Colormap))
         len_first = len(X[0])
         assert all(len(x) == len_first for x in X)
         self._X = X
@@ -194,7 +191,7 @@ def __init__(self, X, cmap=None):
         if cmap is None:
             cmap = 'viridis'
 
-        if isinstance(cmap, six.string_types):
+        if isinstance(cmap, str):
             cmap = _cmaps.cmaps[cmap]()
         self.cmap = cmap
 
diff --git a/plotille/_input_formatter.py b/plotille/_input_formatter.py
index 0fcc0eb..3e2fdb6 100644
--- a/plotille/_input_formatter.py
+++ b/plotille/_input_formatter.py
@@ -27,8 +27,6 @@
 from datetime import date, datetime, time, timedelta
 import math
 
-import six
-
 from ._util import roundeven, timestamp
 
 
@@ -37,18 +35,16 @@ def __init__(self):
         self.formatters = OrderedDict()
 
         self.formatters[float] = _num_formatter
-        for int_type in six.integer_types:
-            self.formatters[int_type] = _num_formatter
+        self.formatters[int] = _num_formatter
 
         self.formatters[date] = _date_formatter
         self.formatters[datetime] = _datetime_formatter
 
-        self.formatters[six.text_type] = _text_formatter
+        self.formatters[str] = _text_formatter
 
         self.converters = OrderedDict()
         self.converters[float] = _convert_numbers
-        for int_type in six.integer_types:
-            self.converters[int_type] = _convert_numbers
+        self.converters[int] = _convert_numbers
 
         self.converters[date] = _convert_date
         self.converters[datetime] = _convert_datetime
@@ -132,13 +128,13 @@ def _datetime_formatter(val, chars, delta, left=False):
 
 
 def _num_formatter(val, chars, delta, left=False):
-    if not (isinstance(val, six.integer_types) or isinstance(val, float)):
+    if not isinstance(val, (int, float)):
         raise ValueError('Only accepting numeric (int/long/float) types, not "{}" of type: {}'.format(val, type(val)))
 
     if abs(val - roundeven(val)) < 1e-8:  # about float (f32) machine precision
         val = int(roundeven(val))
 
-    if isinstance(val, six.integer_types):
+    if isinstance(val, int):
         return _int_formatter(val, chars, left)
     elif isinstance(val, float):
         return _float_formatter(val, chars, left)
@@ -174,7 +170,7 @@ def _float_formatter(val, chars, left=False):
 
 
 def _int_formatter(val, chars, left=False):
-    assert isinstance(val, six.integer_types)
+    assert isinstance(val, int)
     if val != 0:
         sign = 1 if val < 0 else 0
         digits = math.ceil(math.log10(abs(val)))
@@ -204,7 +200,7 @@ def _text_formatter(val, chars, delta, left=False):
 
 
 def _convert_numbers(v):
-    assert isinstance(v, float) or isinstance(v, six.integer_types)
+    assert isinstance(v, float) or isinstance(v, int)
     return float(v)
 
 
diff --git a/plotille/_util.py b/plotille/_util.py
index b437d43..21a12a1 100644
--- a/plotille/_util.py
+++ b/plotille/_util.py
@@ -31,9 +31,6 @@
 def roundeven(x):
     """Round to next even integer number in case of `X.5`
 
-    In Python3 this is the same as `round(x, 0)`, but since Python2 rounds up
-    in that case and I want consistent behaviour, here is the roundeven function.
-
     Parameters:
         x: float  The number to round.
 
@@ -44,10 +41,7 @@ def roundeven(x):
     """
     if math.isinf(x) or math.isnan(x):
         return x  # same behaviour as in python2
-    x_r = round(x)
-    if abs(x_r - x) == 0.5:
-        return int(2.0 * round(x / 2))
-    return x_r
+    return round(x)
 
 
 def _numpy_to_native(x):
diff --git a/plotille/data.py b/plotille/data.py
index d68b461..b8b4b78 100644
--- a/plotille/data.py
+++ b/plotille/data.py
@@ -25,8 +25,6 @@
 
 from math import cos, pi, sin
 
-import six
-
 
 def ellipse(x_center, y_center, angle=0,
             x_amplitude=1, y_amplitude=1, n=20):
@@ -46,11 +44,11 @@ def ellipse(x_center, y_center, angle=0,
                 The X and Y values for the ellipse.
     """
     # see https://en.wikipedia.org/wiki/Ellipse#Parametric_representation
-    assert isinstance(n, six.integer_types)
+    assert isinstance(n, int)
     assert n > 0
-    assert isinstance(x_amplitude, six.integer_types) or isinstance(x_amplitude, float)
+    assert isinstance(x_amplitude, (int, float))
     assert x_amplitude > 0
-    assert isinstance(y_amplitude, six.integer_types) or isinstance(y_amplitude, float)
+    assert isinstance(y_amplitude, (int, float))
     assert y_amplitude > 0
 
     max_ = 2 * pi
@@ -88,6 +86,6 @@ def circle(x_center, y_center, radius, n=20):
            X, Y: Tuple[List[float], List[float]]
                The X and Y values for the circle.
     """
-    assert isinstance(radius, six.integer_types) or isinstance(radius, float)
+    assert isinstance(radius, (int, float))
     assert radius > 0
     return ellipse(x_center, y_center, x_amplitude=radius, y_amplitude=radius, n=n)
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..39feea5
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,763 @@
+[[package]]
+name = "atomicwrites"
+version = "1.4.1"
+description = "Atomic file writes."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "attrs"
+version = "22.1.0"
+description = "Classes Without Boilerplate"
+category = "dev"
+optional = false
+python-versions = ">=3.5"
+
+[package.extras]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit", "cloudpickle"]
+docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "cloudpickle"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "cloudpickle"]
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+description = "Cross-platform colored terminal text."
+category = "dev"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+
+[[package]]
+name = "coverage"
+version = "6.5.0"
+description = "Code coverage measurement for Python"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+tomli = {version = "*", optional = true, markers = "python_full_version <= \"3.11.0a6\" and extra == \"toml\""}
+
+[package.extras]
+toml = ["tomli"]
+
+[[package]]
+name = "flake8"
+version = "5.0.4"
+description = "the modular source code checker: pep8 pyflakes and co"
+category = "dev"
+optional = false
+python-versions = ">=3.6.1"
+
+[package.dependencies]
+importlib-metadata = {version = ">=1.1.0,<4.3", markers = "python_version < \"3.8\""}
+mccabe = ">=0.7.0,<0.8.0"
+pycodestyle = ">=2.9.0,<2.10.0"
+pyflakes = ">=2.5.0,<2.6.0"
+
+[[package]]
+name = "flake8-bugbear"
+version = "22.10.27"
+description = "A plugin for flake8 finding likely bugs and design problems in your program. Contains warnings that don't belong in pyflakes and pycodestyle."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+attrs = ">=19.2.0"
+flake8 = ">=3.0.0"
+
+[package.extras]
+dev = ["tox", "coverage", "hypothesis", "hypothesmith (>=0.2)", "pre-commit"]
+
+[[package]]
+name = "flake8-commas"
+version = "2.1.0"
+description = "Flake8 lint for trailing commas."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+flake8 = ">=2"
+
+[[package]]
+name = "flake8-comprehensions"
+version = "3.10.1"
+description = "A flake8 plugin to help you write better list/set/dict comprehensions."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+flake8 = ">=3.0,<3.2.0 || >3.2.0"
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
+
+[[package]]
+name = "flake8-import-order"
+version = "0.18.2"
+description = "Flake8 and pylama plugin that checks the ordering of import statements."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+pycodestyle = "*"
+
+[[package]]
+name = "flake8-pep3101"
+version = "1.3.0"
+description = "Checks for old string formatting."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+flake8 = ">=3.0"
+
+[package.extras]
+test = ["pytest", "testfixtures"]
+
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+    {file = "pytzdata-2020.1-py2.py3-none-any.whl", hash = "sha256:e1e14750bcf95016381e4d472bad004eef710f2d6417240904070b3d6654485f"},
+    {file = "pytzdata-2020.1.tar.gz", hash = "sha256:3efa13b335a00a8de1d345ae41ec78dd11c9f8807f522d39850f2dd828681540"},
+]
+six = [
+    {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
+    {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},
+]
+toml = [
+    {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
+    {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
+]
+tomli = [
+    {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
+    {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
+]
+typing-extensions = [
+    {file = "typing_extensions-4.4.0-py3-none-any.whl", hash = "sha256:16fa4864408f655d35ec496218b85f79b3437c829e93320c7c9215ccfd92489e"},
+    {file = "typing_extensions-4.4.0.tar.gz", hash = "sha256:1511434bb92bf8dd198c12b1cc812e800d4181cfcb867674e0f8279cc93087aa"},
+]
+zipp = [
+    {file = "zipp-3.11.0-py3-none-any.whl", hash = "sha256:83a28fcb75844b5c0cdaf5aa4003c2d728c77e05f5aeabe8e95e56727005fbaa"},
+    {file = "zipp-3.11.0.tar.gz", hash = "sha256:a7a22e05929290a67401440b39690ae6563279bced5f314609d9d03798f56766"},
+]
diff --git a/pyproject.toml b/pyproject.toml
index 574ba50..7be5270 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [tool.poetry]
 
 name = "plotille"
-version = "4.0.2"
+version = "5.0.0"
 description = "Plot in the terminal using braille dots."
 authors = ["Tammo Ippen <tammo.ippen@posteo.de>"]
 license = "MIT"
@@ -20,12 +20,12 @@ classifiers = [
     'License :: OSI Approved :: MIT License',
     'Intended Audience :: Science/Research',
     'Programming Language :: Python',
-    'Programming Language :: Python :: 2.7',
     'Programming Language :: Python :: 3',
-    'Programming Language :: Python :: 3.6',
     'Programming Language :: Python :: 3.7',
     'Programming Language :: Python :: 3.8',
     'Programming Language :: Python :: 3.9',
+    'Programming Language :: Python :: 3.10',
+    'Programming Language :: Python :: 3.11',
     'Programming Language :: Python :: Implementation :: CPython',
     'Programming Language :: Python :: Implementation :: PyPy',
     'Topic :: Scientific/Engineering :: Visualization',
@@ -33,56 +33,28 @@ classifiers = [
 ]
 
 [tool.poetry.dependencies]
-python = "~2.7 || ^3.6"
-
-six = "^1.16"
+python = "^3.7"
 
 
 [tool.poetry.dev-dependencies]
 
-flake8 = [
-    { version = "^3.9.1", python = "~2.7" },
-    { version = "^4.0.1", python = "^3.6" }
-]
-flake8-bugbear = { version = "^21", python = "^3.6" }
-flake8-commas = "^2.0.0"
-flake8-comprehensions = [
-    { version = "^1", python = "~2.7" },
-    { version = "^3", python = "^3.6" }
-]
+flake8 = "^5"
+flake8-bugbear = "^22"
+flake8-commas = "^2"
+flake8-comprehensions = "^3"
 flake8-import-order = "^0.18"
-flake8-pep3101 = "^1.3.0"
-flake8-polyfill = "^1.0.2"
-flake8-quotes = "^3.2.0"
-funcsigs = { version = "^1.0", python = "~2.7" }
+flake8-pep3101 = "^1"
+flake8-polyfill = "^1"
+flake8-quotes = "^3"
 mock = "^3"
-more_itertools = { version = "5.0.0", python = "~2.7" }  # last release for 2.7
-# remove tests/requirements.txt, if this works
-# numpy = "1.16.6"  # release for 2.7
-# numpy = [
-#     { version = "1.16.6", python = "~2.7" },
-#     { version = "~1.20", python = "~3.6" }
-#     { version = "^1.21.4", python = "^3.7" }
-# ]
-pendulum = "^2.1"
-pep8-naming = "^0.11"
-Pillow = [
-    { version = "6.2.2", python = "~2.7" },
-    { version = "8.4.0", python = "^3.6" }
-]
-pytest = "^4"
-# required for py3.10:
-# pytest = [
-#     { version = "4.6.11", python = "~2.7" },
-#     { version = "6.2.5", python = "^3.7" }
-# ]
-pytest-cov = [
-    { version = "2.12.1", python = "~2.7" },
-    { version = "3.0.0", python = "^3.6" }
+numpy = [
+    { version = "~1.21.4", python = "~3.7" },
+    { version = "^1", python = "^3.8" },
 ]
+pendulum = "^2"
+pep8-naming = "^0.11"
+Pillow = "^9"
+pytest = "^6"
+pytest-cov = "^3"
 pytest-mock = "^2"
-# pytest-mock = [
-#     { version = "1.13.0", python = "~2.7" },
-#     { version = "3.6.1", python = "^3.6" }
-# ]
 pytest-pythonpath =  "^0.7.3"
diff --git a/tests/requirements.txt b/tests/requirements.txt
deleted file mode 100644
index 24ce15a..0000000
--- a/tests/requirements.txt
+++ /dev/null
@@ -1 +0,0 @@
-numpy
diff --git a/tests/test_canvas.py b/tests/test_canvas.py
index 133927f..08f666d 100644
--- a/tests/test_canvas.py
+++ b/tests/test_canvas.py
@@ -5,7 +5,6 @@
 import sys
 
 import pytest
-import six
 
 from plotille import Canvas
 
@@ -65,60 +64,60 @@ def test_invalids():
 
 def test_str():
     c = Canvas(40, 20)
-    assert 'Canvas(width=40, height=20, xmin=0, ymin=0, xmax=1, ymax=1)' == six.text_type(c)
+    assert 'Canvas(width=40, height=20, xmin=0, ymin=0, xmax=1, ymax=1)' == str(c)
     assert 'Canvas(width=40, height=20, xmin=0, ymin=0, xmax=1, ymax=1)' == repr(c)
 
 
 def test_set():
     c = Canvas(1, 1)
     c._set(0, 0)
-    assert '⡀' == six.text_type(c._canvas[0][0])
+    assert '⡀' == str(c._canvas[0][0])
     c._set(0, 0, False)
-    assert '⠀' == six.text_type(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][0])
 
     c._set(0, 1)
-    assert '⠄' == six.text_type(c._canvas[0][0])
+    assert '⠄' == str(c._canvas[0][0])
     c._set(0, 1, False)
-    assert '⠀' == six.text_type(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][0])
 
     c._set(0, 2)
-    assert '⠂' == six.text_type(c._canvas[0][0])
+    assert '⠂' == str(c._canvas[0][0])
     c._set(0, 2, False)
-    assert '⠀' == six.text_type(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][0])
 
     c._set(0, 3)
-    assert '⠁' == six.text_type(c._canvas[0][0])
+    assert '⠁' == str(c._canvas[0][0])
     c._set(0, 3, False)
-    assert '⠀' == six.text_type(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][0])
 
     c._set(1, 0)
-    assert '⢀' == six.text_type(c._canvas[0][0])
+    assert '⢀' == str(c._canvas[0][0])
     c._set(1, 0, False)
-    assert '⠀' == six.text_type(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][0])
 
     c._set(1, 1)
-    assert '⠠' == six.text_type(c._canvas[0][0])
+    assert '⠠' == str(c._canvas[0][0])
     c._set(1, 1, False)
-    assert '⠀' == six.text_type(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][0])
 
     c._set(1, 2)
-    assert '⠐' == six.text_type(c._canvas[0][0])
+    assert '⠐' == str(c._canvas[0][0])
     c._set(1, 2, False)
-    assert '⠀' == six.text_type(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][0])
 
     c._set(1, 3)
-    assert '⠈' == six.text_type(c._canvas[0][0])
+    assert '⠈' == str(c._canvas[0][0])
     c._set(1, 3, False)
-    assert '⠀' == six.text_type(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][0])
 
 
 def test_fill_char():
     c = Canvas(1, 1)
 
     c.fill_char(0.5, 0.5)
-    assert '⣿' == six.text_type(c._canvas[0][0])
+    assert '⣿' == str(c._canvas[0][0])
     c.fill_char(0.5, 0.5, False)
-    assert '⠀' == six.text_type(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][0])
 
 
 @pytest.mark.parametrize('color', [None, 'red'])
@@ -132,9 +131,9 @@ def test_point(color, tty):
         prefix = '\x1b[31m'
         postfix = '\x1b[0m'
 
-    assert '{}⡀{}'.format(prefix, postfix) == six.text_type(c._canvas[0][0])
+    assert '{}⡀{}'.format(prefix, postfix) == str(c._canvas[0][0])
     c.point(0, 0, set_=False, color=color)
-    assert '⠀' == six.text_type(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][0])
 
 
 @pytest.mark.parametrize('color', [None, 'red'])
@@ -148,38 +147,38 @@ def test_set_text(color, tty):
         prefix = '\x1b[31m'
         postfix = '\x1b[0m'
 
-    assert '{}H{}'.format(prefix, postfix) == six.text_type(c._canvas[0][0])
-    assert '{}i{}'.format(prefix, postfix) == six.text_type(c._canvas[0][1])
+    assert '{}H{}'.format(prefix, postfix) == str(c._canvas[0][0])
+    assert '{}i{}'.format(prefix, postfix) == str(c._canvas[0][1])
     c.text(0, 0, 'Hi', False, color=color)
-    assert '⠀' == six.text_type(c._canvas[0][0])
-    assert '⠀' == six.text_type(c._canvas[0][1])
+    assert '⠀' == str(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][1])
 
 
 def test_set_text_keep_dots():
     c = Canvas(2, 1)
 
     c.fill_char(0, 0)
-    assert '⣿' == six.text_type(c._canvas[0][0])
+    assert '⣿' == str(c._canvas[0][0])
 
     c.text(0, 0, 'Hi')
-    assert 'H' == six.text_type(c._canvas[0][0])
-    assert 'i' == six.text_type(c._canvas[0][1])
+    assert 'H' == str(c._canvas[0][0])
+    assert 'i' == str(c._canvas[0][1])
     c.fill_char(0.5, 0.5, False)
     c.text(0, 0, 'Hi', False)
-    assert '⣿' == six.text_type(c._canvas[0][0])
-    assert '⠀' == six.text_type(c._canvas[0][1])
+    assert '⣿' == str(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][1])
 
 
 def test_set_text_to_long():
     c = Canvas(2, 1)
 
     c.text(0, 0, 'Hello World')
-    assert 'H' == six.text_type(c._canvas[0][0])
-    assert 'e' == six.text_type(c._canvas[0][1])
+    assert 'H' == str(c._canvas[0][0])
+    assert 'e' == str(c._canvas[0][1])
     c.fill_char(0.5, 0.5, False)
     c.text(0, 0, 'Hello World', False)
-    assert '⠀' == six.text_type(c._canvas[0][0])
-    assert '⠀' == six.text_type(c._canvas[0][1])
+    assert '⠀' == str(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][1])
 
 
 @pytest.mark.parametrize('empty', ['', None])
@@ -187,12 +186,12 @@ def test_set_text_empty(empty):
     c = Canvas(2, 1)
 
     c.text(0, 0, empty)
-    assert '⠀' == six.text_type(c._canvas[0][0])
-    assert '⠀' == six.text_type(c._canvas[0][1])
+    assert '⠀' == str(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][1])
     c.fill_char(0.5, 0.5, False)
     c.text(0, 0, empty, False)
-    assert '⠀' == six.text_type(c._canvas[0][0])
-    assert '⠀' == six.text_type(c._canvas[0][1])
+    assert '⠀' == str(c._canvas[0][0])
+    assert '⠀' == str(c._canvas[0][1])
 
 
 @pytest.mark.parametrize('other_color', [None, 'blue'])
@@ -203,11 +202,11 @@ def test_unset_keep_color_text(tty, other_color):
     prefix = '\x1b[31m'
     postfix = '\x1b[0m'
 
-    assert '{}H{}'.format(prefix, postfix) == six.text_type(c._canvas[0][0])
-    assert '{}i{}'.format(prefix, postfix) == six.text_type(c._canvas[0][1])
+    assert '{}H{}'.format(prefix, postfix) == str(c._canvas[0][0])
+    assert '{}i{}'.format(prefix, postfix) == str(c._canvas[0][1])
     c.text(0, 0, 'Hi', False, color=other_color)
-    assert '{}⠀{}'.format(prefix, postfix) == six.text_type(c._canvas[0][0])
-    assert '{}⠀{}'.format(prefix, postfix) == six.text_type(c._canvas[0][1])
+    assert '{}⠀{}'.format(prefix, postfix) == str(c._canvas[0][0])
+    assert '{}⠀{}'.format(prefix, postfix) == str(c._canvas[0][1])
 
 
 @pytest.mark.parametrize('other_color', [None, 'blue'])
@@ -218,9 +217,9 @@ def test_unset_keep_color_dots(tty, other_color):
     prefix = '\x1b[31m'
     postfix = '\x1b[0m'
 
-    assert '{}⡀{}'.format(prefix, postfix) == six.text_type(c._canvas[0][0])
+    assert '{}⡀{}'.format(prefix, postfix) == str(c._canvas[0][0])
     c.point(0, 0, set_=False, color=other_color)
-    assert '{}⠀{}'.format(prefix, postfix) == six.text_type(c._canvas[0][0])
+    assert '{}⠀{}'.format(prefix, postfix) == str(c._canvas[0][0])
 
 
 @pytest.mark.skipif(not have_pillow, reason='No pillow installed.')
diff --git a/tests/test_dots.py b/tests/test_dots.py
index 8081db7..aaf14f2 100644
--- a/tests/test_dots.py
+++ b/tests/test_dots.py
@@ -3,8 +3,6 @@
 
 from itertools import combinations
 
-import six
-
 from plotille._dots import braille_from, Dots, dots_from
 
 
@@ -105,44 +103,44 @@ def test_print():
     d = Dots()
 
     d.update(0, 0)
-    assert '⡀' == six.text_type(d)
+    assert '⡀' == str(d)
     d.update(0, 0, False)
-    assert '⠀' == six.text_type(d)
+    assert '⠀' == str(d)
 
     d.update(0, 1)
-    assert '⠄' == six.text_type(d)
+    assert '⠄' == str(d)
     d.update(0, 1, False)
-    assert '⠀' == six.text_type(d)
+    assert '⠀' == str(d)
 
     d.update(0, 2)
-    assert '⠂' == six.text_type(d)
+    assert '⠂' == str(d)
     d.update(0, 2, False)
-    assert '⠀' == six.text_type(d)
+    assert '⠀' == str(d)
 
     d.update(0, 3)
-    assert '⠁' == six.text_type(d)
+    assert '⠁' == str(d)
     d.update(0, 3, False)
-    assert '⠀' == six.text_type(d)
+    assert '⠀' == str(d)
 
     d.update(1, 0)
-    assert '⢀' == six.text_type(d)
+    assert '⢀' == str(d)
     d.update(1, 0, False)
-    assert '⠀' == six.text_type(d)
+    assert '⠀' == str(d)
 
     d.update(1, 1)
-    assert '⠠' == six.text_type(d)
+    assert '⠠' == str(d)
     d.update(1, 1, False)
-    assert '⠀' == six.text_type(d)
+    assert '⠀' == str(d)
 
     d.update(1, 2)
-    assert '⠐' == six.text_type(d)
+    assert '⠐' == str(d)
     d.update(1, 2, False)
-    assert '⠀' == six.text_type(d)
+    assert '⠀' == str(d)
 
     d.update(1, 3)
-    assert '⠈' == six.text_type(d)
+    assert '⠈' == str(d)
     d.update(1, 3, False)
-    assert '⠀' == six.text_type(d)
+    assert '⠀' == str(d)
 
 
 def test_braille_dots_from():
@@ -190,10 +188,10 @@ def test_markers():
     assert repr(d) == 'Dots(dots=[], marker=None, fg=None, bg=None, color_kwargs=mode: names)'
 
     d.update(0, 0)
-    assert '⡀' == six.text_type(d)
+    assert '⡀' == str(d)
 
     d.update(0, 0, marker='x')
-    assert 'x' == six.text_type(d)
+    assert 'x' == str(d)
 
     d.marker = None
-    assert '⡀' == six.text_type(d)
+    assert '⡀' == str(d)
diff --git a/tests/test_figure_data.py b/tests/test_figure_data.py
index 3697340..85f6dbc 100644
--- a/tests/test_figure_data.py
+++ b/tests/test_figure_data.py
@@ -75,7 +75,7 @@ def test_heat_of_image(tty, mode, normalized):
             x_val = x / width
             rgb = [y_val, x_val, random()]
             if not normalized:
-                rgb = list(map(lambda z: round(z * 255), rgb))
+                rgb = [round(z * 255) for z in rgb]
             row.append(rgb)
         xs.append(row)