Add venv module stub (#3783)

stdlib/3/venv/__init__.pyi

@@ -0,0 +1,41 @@
+import sys
+
+from typing import Optional, Sequence, Text, Union, AnyStr
+from types import SimpleNamespace
+
+if sys.version_info >= (3, 6):
+    from builtins import _PathLike
+    _Path = Union[str, bytes, _PathLike[str], _PathLike[bytes]]
+else:
+    _Path = Union[str, bytes]
+
+class EnvBuilder:
+    system_site_packages: bool
+    clear: bool
+    symlinks: bool
+    upgrade: bool
+    with_pip: bool
+    if sys.version_info >= (3, 6):
+        prompt: Optional[str]
+
+    if sys.version_info >= (3, 6):
+        def __init__(self, system_site_packages: bool = ..., clear: bool = ..., symlinks: bool = ..., upgrade: bool = ..., with_pip: bool = ..., prompt: Optional[str] = ...) -> None: ...
+    else:
+        def __init__(self, system_site_packages: bool = ..., clear: bool = ..., symlinks: bool = ..., upgrade: bool = ..., with_pip: bool = ...) -> None: ...
+    def create(self, env_dir: _Path) -> None: ...
+    def clear_directory(self, path: _Path) -> None: ...  # undocumented
+    def ensure_directories(self, env_dir: _Path) -> SimpleNamespace: ...
+    def create_configuration(self, context: SimpleNamespace) -> None: ...
+    def symlink_or_copy(self, src: _Path, dst: _Path, relative_symlinks_ok: bool = ...) -> None: ...  # undocumented
+    def setup_python(self, context: SimpleNamespace) -> None: ...
+    def _setup_pip(self, context: SimpleNamespace) -> None: ...  # undocumented
+    def setup_scripts(self, context: SimpleNamespace) -> None: ...
+    def post_setup(self, context: SimpleNamespace) -> None: ...
+    def replace_variables(self, text: str, context: SimpleNamespace) -> str: ...  # undocumented
+    def install_scripts(self, context: SimpleNamespace, path: str) -> None: ...
+
+if sys.version_info >= (3, 6):
+    def create(env_dir: _Path, system_site_packages: bool = ..., clear: bool = ..., symlinks: bool = ..., with_pip: bool = ..., prompt: Optional[str] = ...) -> None: ...
+else:
+    def create(env_dir: _Path, system_site_packages: bool = ..., clear: bool = ..., symlinks: bool = ..., with_pip: bool = ...) -> None: ...
+def main(args: Optional[Sequence[Text]] = ...) -> None: ...