Implemented PEP 405 (Python virtual environments).

Lib/venv/scripts/nt/Activate.ps1

@@ -0,0 +1,34 @@
+$env:VIRTUAL_ENV="__VENV_DIR__"
+
+# Revert to original values
+if (Test-Path function:_OLD_VIRTUAL_PROMPT) {
+    copy-item function:_OLD_VIRTUAL_PROMPT function:prompt
+    remove-item function:_OLD_VIRTUAL_PROMPT
+}
+
+if (Test-Path env:_OLD_VIRTUAL_PYTHONHOME) {
+    copy-item env:_OLD_VIRTUAL_PYTHONHOME env:PYTHONHOME
+    remove-item env:_OLD_VIRTUAL_PYTHONHOME
+}
+
+if (Test-Path env:_OLD_VIRTUAL_PATH) {
+    copy-item env:_OLD_VIRTUAL_PATH env:PATH
+    remove-item env:_OLD_VIRTUAL_PATH
+}
+
+# Set the prompt to include the env name
+copy-item function:prompt function:_OLD_VIRTUAL_PROMPT
+function prompt {
+    Write-Host -NoNewline -ForegroundColor Green [__VENV_NAME__]
+    _OLD_VIRTUAL_PROMPT
+}
+
+# Clear PYTHONHOME
+if (Test-Path env:PYTHONHOME) {
+    copy-item env:PYTHONHOME env:_OLD_VIRTUAL_PYTHONHOME
+    remove-item env:PYTHONHOME
+}
+
+# Add the venv to the PATH
+copy-item env:PATH env:_OLD_VIRTUAL_PATH
+$env:PATH = "$env:VIRTUAL_ENV\__VENV_BIN_NAME__;$env:PATH"

Lib/venv/scripts/nt/Deactivate.ps1

@@ -0,0 +1,19 @@
+# Revert to original values
+if (Test-Path function:_OLD_VIRTUAL_PROMPT) {
+    copy-item function:_OLD_VIRTUAL_PROMPT function:prompt
+    remove-item function:_OLD_VIRTUAL_PROMPT
+}
+
+if (Test-Path env:_OLD_VIRTUAL_PYTHONHOME) {
+    copy-item env:_OLD_VIRTUAL_PYTHONHOME env:PYTHONHOME
+    remove-item env:_OLD_VIRTUAL_PYTHONHOME
+}
+
+if (Test-Path env:_OLD_VIRTUAL_PATH) {
+    copy-item env:_OLD_VIRTUAL_PATH env:PATH
+    remove-item env:_OLD_VIRTUAL_PATH
+}
+
+if (Test-Path env:VIRTUAL_ENV) {
+    remove-item env:VIRTUAL_ENV
+}

Lib/venv/scripts/nt/activate.bat

@@ -0,0 +1,31 @@
+@echo off
+set VIRTUAL_ENV=__VENV_DIR__
+
+if not defined PROMPT (
+    set PROMPT=$P$G
+)
+
+if defined _OLD_VIRTUAL_PROMPT (
+    set PROMPT=%_OLD_VIRTUAL_PROMPT%
+)
+
+if defined _OLD_VIRTUAL_PYTHONHOME (
+     set PYTHONHOME=%_OLD_VIRTUAL_PYTHONHOME%
+)
+
+set _OLD_VIRTUAL_PROMPT=%PROMPT%
+set PROMPT=__VENV_NAME__%PROMPT%
+
+if defined PYTHONHOME (
+     set _OLD_VIRTUAL_PYTHONHOME=%PYTHONHOME%
+     set PYTHONHOME=
+)
+
+if defined _OLD_VIRTUAL_PATH set PATH=%_OLD_VIRTUAL_PATH%; goto SKIPPATH
+
+set _OLD_VIRTUAL_PATH=%PATH%
+
+:SKIPPATH
+set PATH=%VIRTUAL_ENV%\__VENV_BIN_NAME__;%PATH%
+
+:END

Lib/venv/scripts/nt/deactivate.bat

@@ -0,0 +1,17 @@
+@echo off
+
+if defined _OLD_VIRTUAL_PROMPT (
+    set PROMPT=%_OLD_VIRTUAL_PROMPT%
+)
+set _OLD_VIRTUAL_PROMPT=
+
+if defined _OLD_VIRTUAL_PYTHONHOME (
+     set PYTHONHOME=%_OLD_VIRTUAL_PYTHONHOME%
+     set _OLD_VIRTUAL_PYTHONHOME=
+)
+
+if defined _OLD_VIRTUAL_PATH set PATH=%_OLD_VIRTUAL_PATH%
+
+set _OLD_VIRTUAL_PATH=
+
+:END

Lib/venv/scripts/nt/pysetup3-script.py

@@ -0,0 +1,11 @@
+#!__VENV_PYTHON__
+if __name__ == '__main__':
+    rc = 1
+    try:
+        import sys, re, packaging.run
+        sys.argv[0] = re.sub('-script.pyw?$', '', sys.argv[0])
+        rc = packaging.run.main() # None interpreted as 0
+    except Exception:
+        # use syntax which works with either 2.x or 3.x
+        sys.stderr.write('%s\n' % sys.exc_info()[1])
+    sys.exit(rc)

Lib/venv/scripts/posix/activate

@@ -0,0 +1,76 @@
+# This file must be used with "source bin/activate" *from bash*
+# you cannot run it directly
+
+deactivate () {
+    # reset old environment variables
+    if [ -n "$_OLD_VIRTUAL_PATH" ] ; then
+        PATH="$_OLD_VIRTUAL_PATH"
+        export PATH
+        unset _OLD_VIRTUAL_PATH
+    fi
+    if [ -n "$_OLD_VIRTUAL_PYTHONHOME" ] ; then
+        PYTHONHOME="$_OLD_VIRTUAL_PYTHONHOME"
+        export PYTHONHOME
+        unset _OLD_VIRTUAL_PYTHONHOME
+    fi
+
+    # This should detect bash and zsh, which have a hash command that must
+    # be called to get it to forget past commands.  Without forgetting
+    # past commands the $PATH changes we made may not be respected
+    if [ -n "$BASH" -o -n "$ZSH_VERSION" ] ; then
+        hash -r
+    fi
+
+    if [ -n "$_OLD_VIRTUAL_PS1" ] ; then
+        PS1="$_OLD_VIRTUAL_PS1"
+        export PS1
+        unset _OLD_VIRTUAL_PS1
+    fi
+
+    unset VIRTUAL_ENV
+    if [ ! "$1" = "nondestructive" ] ; then
+    # Self destruct!
+        unset -f deactivate
+    fi
+}
+
+# unset irrelavent variables
+deactivate nondestructive
+
+VIRTUAL_ENV="__VENV_DIR__"
+export VIRTUAL_ENV
+
+_OLD_VIRTUAL_PATH="$PATH"
+PATH="$VIRTUAL_ENV/__VENV_BIN_NAME__:$PATH"
+export PATH
+
+# unset PYTHONHOME if set
+# this will fail if PYTHONHOME is set to the empty string (which is bad anyway)
+# could use `if (set -u; : $PYTHONHOME) ;` in bash
+if [ -n "$PYTHONHOME" ] ; then
+    _OLD_VIRTUAL_PYTHONHOME="$PYTHONHOME"
+    unset PYTHONHOME
+fi
+
+if [ -z "$VIRTUAL_ENV_DISABLE_PROMPT" ] ; then
+    _OLD_VIRTUAL_PS1="$PS1"
+    if [ "x__VENV_NAME__" != x ] ; then
+	PS1="__VENV_NAME__$PS1"
+    else
+    if [ "`basename \"$VIRTUAL_ENV\"`" = "__" ] ; then
+        # special case for Aspen magic directories
+        # see http://www.zetadev.com/software/aspen/
+        PS1="[`basename \`dirname \"$VIRTUAL_ENV\"\``] $PS1"
+    else
+        PS1="(`basename \"$VIRTUAL_ENV\"`)$PS1"
+    fi
+    fi
+    export PS1
+fi
+
+# This should detect bash and zsh, which have a hash command that must
+# be called to get it to forget past commands.  Without forgetting
+# past commands the $PATH changes we made may not be respected
+if [ -n "$BASH" -o -n "$ZSH_VERSION" ] ; then
+    hash -r
+fi

Lib/venv/scripts/posix/pysetup3

@@ -0,0 +1,11 @@
+#!__VENV_PYTHON__
+if __name__ == '__main__':
+    rc = 1
+    try:
+        import sys, re, packaging.run
+        sys.argv[0] = re.sub('-script.pyw?$', '', sys.argv[0])
+        rc = packaging.run.main() # None interpreted as 0
+    except Exception:
+        # use syntax which works with either 2.x or 3.x
+        sys.stderr.write('%s\n' % sys.exc_info()[1])
+    sys.exit(rc)