Add typing_extensions dependency on python < 3.8

pyproject.toml

@@ -8,6 +8,7 @@ authors = [
 readme = "README.md"
 requires-python = ">=3.6"
 dependencies = [
+    "typing_extensions ; python_version < '3.8'",
     "IPython",
     "jsonschema",
 ]

src/ipyvizzu/__init__.py

@@ -46,7 +46,6 @@
 * [DisplayTemplate][ipyvizzu.template.DisplayTemplate]
 """
 
-import sys
 import warnings
 
 from .chart import Chart
@@ -70,7 +69,7 @@
 from .template import ChartProperty, DisplayTarget, DisplayTemplate
 from .event import EventHandler
 
-from .__version__ import __version__
+from .__version__ import __version__, PYENV
 
 __all__ = [
     "Chart",
@@ -103,8 +102,8 @@
 ]
 
 
-if sys.version_info < (3, 7):
-    # TODO: remove once support for Python 3.6 is dropped
+# TODO: remove once support for Python 3.6 is dropped
+if PYENV < (3, 7):
     warnings.warn(
         "Python 3.6 support will be dropped in future versions.",
         FutureWarning,

src/ipyvizzu/__version__.py

@@ -1,3 +1,8 @@
 """A module for storing version number."""
 
+import sys
+
+
 __version__ = "0.15.0"
+
+PYENV = sys.version_info

src/ipyvizzu/data/converters/pandas/protocol.py

@@ -3,7 +3,16 @@
 """
 
 from typing import Any, Callable, Sequence
-from typing_extensions import Protocol, runtime_checkable
+
+from ipyvizzu.__version__ import PYENV
+
+
+if PYENV >= (3, 8):
+    from typing import Protocol, runtime_checkable
+else:
+    # TODO: remove once support for Python 3.7 is dropped
+    # pylint: disable=duplicate-code
+    from typing_extensions import Protocol, runtime_checkable  # type: ignore
 
 
 @runtime_checkable

src/ipyvizzu/data/converters/spark/protocol.py

@@ -3,7 +3,16 @@
 """
 
 from typing import Any, Callable, Sequence
-from typing_extensions import Protocol, runtime_checkable
+
+from ipyvizzu.__version__ import PYENV
+
+
+if PYENV >= (3, 8):
+    from typing import Protocol, runtime_checkable
+else:
+    # TODO: remove once support for Python 3.7 is dropped
+    # pylint: disable=duplicate-code
+    from typing_extensions import Protocol, runtime_checkable  # type: ignore
 
 
 @runtime_checkable

tests/test_docs/tutorial/test_data.py

@@ -1,14 +1,15 @@
 # pylint: disable=missing-module-docstring,missing-class-docstring,missing-function-docstring
 
 from pathlib import Path
-import sys
 import unittest
 
 import numpy as np
 import pandas as pd
 from pyspark.sql import SparkSession
 from pyspark.sql.types import StructType, StructField, StringType, IntegerType
 
+from ipyvizzu.__version__ import PYENV
+
 from tests.test_data import DataWithAssets
 
 
@@ -70,7 +71,7 @@ def test_with_csv(self) -> None:
         )
 
     # TODO: remove decorator once support for Python 3.6 is dropped
-    @unittest.skipUnless(sys.version_info >= (3, 7), "at least Python 3.7 is required")
+    @unittest.skipUnless(PYENV >= (3, 7), "at least Python 3.7 is required")
     def test_with_xlsx(self) -> None:
         df = pd.read_excel(self.docs_dir / "music_data.xlsx")
         self.data.add_df(df)

tests/test_fugue.py

@@ -3,25 +3,24 @@
 from contextlib import redirect_stdout
 import io
 import pathlib
-import sys
 import unittest
 
 import pandas as pd
 
+from ipyvizzu.__version__ import PYENV
+
 from tests.utils.normalizer import Normalizer
 
 
-if sys.version_info >= (3, 7):
+# TODO: remove once support for Python 3.6 is dropped
+if PYENV >= (3, 7):
     import fugue.api as fa
     import ipyvizzu.integrations.fugue  # register the extension  # pylint: disable=unused-import
-else:
-    # TODO: remove once support for Python 3.6 is dropped
-    pass
 
 
 class TestFugue(unittest.TestCase):
     # TODO: remove decorator once support for Python 3.6 is dropped
-    @unittest.skipUnless(sys.version_info >= (3, 7), "at least Python 3.7 is required")
+    @unittest.skipUnless(PYENV >= (3, 7), "at least Python 3.7 is required")
     def test_fugue_extension_preset(self) -> None:
         ref = pathlib.Path(__file__).parent / "assets" / "ref_fugue_preset.txt"
         with open(ref, "r", encoding="utf8") as f_ref:
@@ -43,7 +42,7 @@ def test_fugue_extension_preset(self) -> None:
         )
 
     # TODO: remove decorator once support for Python 3.6 is dropped
-    @unittest.skipUnless(sys.version_info >= (3, 7), "at least Python 3.7 is required")
+    @unittest.skipUnless(PYENV >= (3, 7), "at least Python 3.7 is required")
     def test_fugue_extension_timeline(self) -> None:
         ref = pathlib.Path(__file__).parent / "assets" / "ref_fugue_timeline.txt"
         with open(ref, "r", encoding="utf8") as f_ref: