optimize installation (#3202)

Author: msyyc

.chronus/changes/optimize-install-speed-2025-8-22-17-4-59.md

@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@azure-tools/typespec-python"
+---
+
+Improve install process

packages/typespec-python/scripts/install.py

@@ -23,24 +23,4 @@
     raise Exception("Your Python installation doesn't have venv available")
 
 
-# Now we have a package manager (uv or pip) and Py >= 3.9, go to work
-
-from pathlib import Path
-
-_ROOT_DIR = Path(__file__).parent.parent
-
-
-def main():
-    venv_path = _ROOT_DIR / "venv"
-
-    # Create virtual environment using package manager abstraction
-    from package_manager import create_venv_with_package_manager, install_packages
-
-    venv_context = create_venv_with_package_manager(venv_path)
-
-    # Install required packages - install_packages handles package manager logic
-    install_packages(["-U", "black"], venv_context)
-
-
-if __name__ == "__main__":
-    main()
+# Now we have a package manager (uv or pip) and Py >= 3.9 and check is over

packages/typespec-python/scripts/prepare.py

@@ -18,9 +18,9 @@
 
 def main():
     venv_path = _ROOT_DIR / "venv"
-    venv_preexists = venv_path.exists()
 
-    assert venv_preexists  # Otherwise install was not done
+    # Create virtual environment using package manager abstraction
+    from package_manager import create_venv_with_package_manager, install_packages
 
     venv_context = create_venv_with_package_manager(venv_path)