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diff --git a/src/prompt_toolkit/__init__.py b/src/prompt_toolkit/__init__.py
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+++ b/src/prompt_toolkit/__init__.py
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+"""
+prompt_toolkit
+==============
+
+Author: Jonathan Slenders
+
+Description: prompt_toolkit is a Library for building powerful interactive
+             command lines in Python.  It can be a replacement for GNU
+             Readline, but it can be much more than that.
+
+See the examples directory to learn about the usage.
+
+Probably, to get started, you might also want to have a look at
+`prompt_toolkit.shortcuts.prompt`.
+"""
+from __future__ import annotations
+
+import re
+
+# note: this is a bit more lax than the actual pep 440 to allow for a/b/rc/dev without a number
+pep440 = re.compile(
+    r"^([1-9]\d*!)?(0|[1-9]\d*)(\.(0|[1-9]\d*))*((a|b|rc)(0|[1-9]\d*)?)?(\.post(0|[1-9]\d*))?(\.dev(0|[1-9]\d*)?)?$",
+    re.UNICODE,
+)
+from .application import Application
+from .formatted_text import ANSI, HTML
+from .shortcuts import PromptSession, print_formatted_text, prompt
+
+# Don't forget to update in `docs/conf.py`!
+__version__ = "3.0.43"
+
+assert pep440.match(__version__)
+
+# Version tuple.
+VERSION = tuple(int(v.rstrip("abrc")) for v in __version__.split(".")[:3])
+
+
+__all__ = [
+    # Application.
+    "Application",
+    # Shortcuts.
+    "prompt",
+    "PromptSession",
+    "print_formatted_text",
+    # Formatted text.
+    "HTML",
+    "ANSI",
+    # Version info.
+    "__version__",
+    "VERSION",
+]