Use importlib-metadata backport for getting version

poetry.lock

@@ -764,7 +764,7 @@ testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "e7353ea5318ad3fa2943ee707f2c1930783c355bad6a28aec3d97c0b917b6dbf"
+content-hash = "256c1d6571a11bf4b80d0eba16d9e39bf2965c4436281c3ec40033cca54aa098"
 
 [metadata.files]
 aiohttp = [

pyproject.toml

@@ -27,6 +27,7 @@ rich = "^12.0.0"
 #rich = {git = "git@github.com:willmcgugan/rich", rev = "link-id"}
 typing-extensions = { version = "^3.10.0", python = "<3.8" }
 click = "8.1.2"
+importlib-metadata = "^4.11.3"
 
 [tool.poetry.dev-dependencies]
 pytest = "^6.2.3"

src/textual/__init__.py

@@ -3,7 +3,6 @@ import inspect
 from rich.console import RenderableType
 
 __all__ = ["log", "panic"]
-__version__ = "0.1.15"
 
 
 def log(*args: object, verbosity: int = 0, **kwargs) -> None:

src/textual/cli/cli.py

@@ -1,11 +1,11 @@
 import click
+from importlib_metadata import version
 
-import textual
 from textual.devtools.server import _run_devtools
 
 
 @click.group()
-@click.version_option(textual.__version__)
+@click.version_option(version("textual"))
 def run():
     pass
 

src/textual/devtools/renderables.py

@@ -5,12 +5,11 @@ from datetime import datetime, timezone
 from pathlib import Path
 from typing import Iterable
 
+from importlib_metadata import version
 from rich.containers import Renderables
 from rich.style import Style
 from rich.text import Text
 
-import textual
-
 if sys.version_info >= (3, 8):
     from typing import Literal
 else:
@@ -33,7 +32,7 @@ class DevConsoleHeader:
     ) -> RenderResult:
         lines = Renderables(
             [
-                f"[bold]Textual Development Console [#b169dd]v{textual.__version__}",
+                f"[bold]Textual Development Console [#b169dd]v{version('textual')}",
                 "[#967fa3]Run a Textual app with the environment variable [b]TEXTUAL_DEVTOOLS=1[/] to connect.",
                 "[#967fa3]Press [b]Ctrl+C[/] to quit.",
             ]

tests/cli/test_cli.py

@@ -1,10 +1,10 @@
 from click.testing import CliRunner
+from importlib_metadata import version
 
-import textual
 from textual.cli.cli import run
 
 
 def test_cli_version():
     runner = CliRunner()
     result = runner.invoke(run, ["--version"])
-    assert textual.__version__ in result.output, "You need to update __version__"
+    assert version("textual") in result.output