🔥 Drop support for Python 3.7 (#830)

Co-authored-by: svlandeg <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Sofie Van Landeghem <[email protected]>

Author: 3 people

.github/workflows/test.yml

@@ -22,8 +22,6 @@ jobs:
         os: [ ubuntu-latest, windows-latest, macos-latest ]
         python-version: [ "3.13" ]
         include:
-          - os: ubuntu-22.04
-            python-version: "3.7"
           - os: macos-latest
             python-version: "3.8"
           - os: windows-latest

pyproject.toml

@@ -9,7 +9,7 @@ description = "Typer, build great CLIs. Easy to code. Based on Python type hints
 authors = [
     {name = "Sebastián Ramírez", email = "[email protected]"},
 ]
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 classifiers = [
     "Intended Audience :: Information Technology",
     "Intended Audience :: System Administrators",
@@ -24,7 +24,6 @@ classifiers = [
     "Development Status :: 4 - Beta",
     "Intended Audience :: Developers",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",

typer/_typing.py

@@ -1,6 +1,6 @@
 # Copied from pydantic 1.9.2 (the latest version to support python 3.6.)
 # https://github.com/pydantic/pydantic/blob/v1.9.2/pydantic/typing.py
-# Reduced drastically to only include Typer-specific 3.7+ functionality
+# Reduced drastically to only include Typer-specific 3.8+ functionality
 # mypy: ignore-errors
 
 import sys
@@ -57,17 +57,7 @@ def is_union(tp: Optional[Type[Any]]) -> bool:
 NONE_TYPES: Tuple[Any, Any, Any] = (None, NoneType, Literal[None])
 
 
-if sys.version_info < (3, 8):
-    # Even though this implementation is slower, we need it for python 3.7:
-    # In python 3.7 "Literal" is not a builtin type and uses a different
-    # mechanism.
-    # for this reason `Literal[None] is Literal[None]` evaluates to `False`,
-    # breaking the faster implementation used for the other python versions.
-
-    def is_none_type(type_: Any) -> bool:
-        return type_ in NONE_TYPES
-
-elif sys.version_info[:2] == (3, 8):
+if sys.version_info[:2] == (3, 8):
     # We can use the fast implementation for 3.8 but there is a very weird bug
     # where it can fail for `Literal[None]`.
     # We just need to redefine a useless `Literal[None]` inside the function body to fix this