Typing stubs for pywin32

Warnings

• breaking Type stubs are versioned to align with specific `pywin32` major versions. If `pywin32` undergoes a major API change, `types-pywin32` will update to reflect the new API, potentially causing type-checking errors for code using older `pywin32` versions.
  Fix: Ensure the installed `types-pywin32` version matches the `pywin32` version you are using (e.g., `types-pywin32==311.*` for `pywin32==311.*`). Pin both dependencies in your project.
• gotcha The underlying `pywin32` library often requires a post-install script (`python -m pywin32_postinstall -install`) to register COM components and place DLLs. Failure to run this, especially in virtual environments or when running as a Windows Service, can lead to runtime errors even if `types-pywin32` is correctly installed.
  Fix: After installing `pywin32`, run `python -m pywin32_postinstall -install` from an elevated command prompt outside of a virtual environment for global installs, or ensure proper environment setup for virtual environments or services. Verify `PATH` settings.
• gotcha Some `pywin32` functions may exhibit incorrect parameter resolution or `reportCallIssue` warnings in type checkers (e.g., Pylance) due to stubs defining parameters as positional-only when they are commonly used as keyword arguments, or other discrepancies in stub definitions.
  Fix: Refer to the official `pywin32` documentation or typeshed for the exact expected parameter signature. If necessary, create a local stub override or contribute a fix to typeshed. Consider using positional arguments if keyword arguments are not recognized by the type checker.
• gotcha When bundling applications with tools like PyInstaller, users may encounter `win32ctypes.pywin32.pywintypes.error`. This typically indicates issues with the `pywin32` installation, version incompatibilities with PyInstaller, or incorrect PATH configurations for its DLLs.
  Fix: Ensure correct `pywin32` installation, try reinstalling `pywin32`, manually running the `pywin32_postinstall` script, or testing with specific PyInstaller versions known to be compatible. Ensure the environment `PATH` is correctly configured.
• deprecated Users might encounter `DeprecationWarning: getargs: The 'u' format is deprecated. Use 'U' instead` originating from `pywintypes.py` within `pywin32`. This indicates internal usage of an older Python C API format for Unicode, which has a newer, preferred alternative.
  Fix: This warning typically comes from the `pywin32` library itself and often does not impact functionality. Ensure you are using a recent version of `pywin32` and Python, as updates to `pywin32` may address this internally.

Install

• pip install types-pywin32 Install types-pywin32

Imports

• win32api

  import win32api

  Type information for win32api is provided by types-pywin32 when a type checker is run.
• win32com.client

  import win32com.client

  Used for COM automation; types-pywin32 adds static type checking to these interactions.
• pywintypes

  import pywintypes

  Contains core Windows types; types-pywin32 provides their definitions for static analysis.

Quickstart

This quickstart demonstrates typical usage of `pywin32` and how `types-pywin32` silently provides type annotations for static analysis tools. You do not import `types-pywin32` directly; rather, its presence enables type checkers to understand the `pywin32` API.

import win32api
import win32con
from typing import TYPE_CHECKING
import os

# types-pywin32 provides type information for pywin32 modules like win32api.
# It is not imported directly into your runtime code.
# Its benefits are seen when running a static type checker (e.g., mypy, pyright).

# Example 1: Getting a Windows system directory with type hint
windows_directory: str = win32api.GetWindowsDirectory()
print(f"Windows Directory: {windows_directory}")

# Example 2: Using a constant from win32con and a function from win32api
# The actual MessageBox call is commented out to prevent interactive prompts
# during automated tests or in non-interactive environments.

if TYPE_CHECKING:
    # Type checkers will use the stubs for win32api.MessageBox here.
    # In a real application, you'd ensure the function call arguments match
    # the stub definitions provided by types-pywin32.
    pass
else:
    try:
        # Example of a win32api call (commented out for quickstart execution)
        # win32api.MessageBox(0, "Hello from pywin32!", "Pywin32 Example", win32con.MB_OK)
        print("MessageBox call skipped in quickstart to avoid UI interaction.")
    except Exception as e:
        print(f"Could not display message box (expected if not on Windows or interactive): {e}")

print("Static type checking for pywin32 is enhanced by types-pywin32.")