Drop Python 3.6.

examples/prompts/asyncio-prompt.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python
 """
-(Python >= 3.6)
 This is an example of how to prompt inside an application that uses the asyncio
 eventloop. The ``prompt_toolkit`` library will make sure that when other
 coroutines are writing to stdout, they write above the prompt, not destroying

examples/ssh/asyncssh-server.py

@@ -4,13 +4,13 @@
 """
 import asyncio
 import logging
+from asyncio import run
 
 import asyncssh
 from pygments.lexers.html import HtmlLexer
 
 from prompt_toolkit.completion import WordCompleter
 from prompt_toolkit.contrib.ssh import PromptToolkitSSHServer, PromptToolkitSSHSession
-from prompt_toolkit.eventloop import get_event_loop
 from prompt_toolkit.lexers import PygmentsLexer
 from prompt_toolkit.shortcuts import ProgressBar, print_formatted_text
 from prompt_toolkit.shortcuts.dialogs import input_dialog, yes_no_dialog
@@ -101,22 +101,21 @@ async def interact(ssh_session: PromptToolkitSSHSession) -> None:
     await input_dialog("Input dialog", "Running over asyncssh").run_async()
 
 
-def main(port=8222):
+async def main(port=8222):
     # Set up logging.
     logging.basicConfig()
     logging.getLogger().setLevel(logging.DEBUG)
 
-    loop = get_event_loop()
-    loop.run_until_complete(
-        asyncssh.create_server(
-            lambda: PromptToolkitSSHServer(interact),
-            "",
-            port,
-            server_host_keys=["/etc/ssh/ssh_host_ecdsa_key"],
-        )
+    await asyncssh.create_server(
+        lambda: PromptToolkitSSHServer(interact),
+        "",
+        port,
+        server_host_keys=["/etc/ssh/ssh_host_ecdsa_key"],
     )
-    loop.run_forever()
+
+    # Run forever.
+    await asyncio.Future()
 
 
 if __name__ == "__main__":
-    main()
+    asyncio.run(main())

examples/telnet/chat-app.py

@@ -6,9 +6,9 @@
 """
 import logging
 import random
+from asyncio import Future, run
 
 from prompt_toolkit.contrib.telnet.server import TelnetServer
-from prompt_toolkit.eventloop import get_event_loop
 from prompt_toolkit.formatted_text import HTML
 from prompt_toolkit.shortcuts import PromptSession, clear
 
@@ -91,11 +91,13 @@ def _send_to_everyone(sender_connection, name, message, color):
             )
 
 
-def main():
+async def main():
     server = TelnetServer(interact=interact, port=2323)
     server.start()
-    get_event_loop().run_forever()
+
+    # Run forever.
+    await Future()
 
 
 if __name__ == "__main__":
-    main()
+    run(main())

examples/telnet/dialog.py

@@ -3,9 +3,9 @@
 Example of a telnet application that displays a dialog window.
 """
 import logging
+from asyncio import Future, run
 
 from prompt_toolkit.contrib.telnet.server import TelnetServer
-from prompt_toolkit.eventloop import get_event_loop
 from prompt_toolkit.shortcuts.dialogs import yes_no_dialog
 
 # Set up logging
@@ -22,11 +22,13 @@ async def interact(connection):
     connection.send("Bye.\n")
 
 
-def main():
+async def main():
     server = TelnetServer(interact=interact, port=2323)
     server.start()
-    get_event_loop().run_forever()
+
+    # Run forever.
+    await Future()
 
 
 if __name__ == "__main__":
-    main()
+    run(main())

examples/telnet/hello-world.py

@@ -7,9 +7,9 @@
 That is probably the preferred way if you only need Python 3 support.
 """
 import logging
+from asyncio import Future, run
 
 from prompt_toolkit.contrib.telnet.server import TelnetServer
-from prompt_toolkit.eventloop import get_event_loop
 from prompt_toolkit.shortcuts import PromptSession, clear
 
 # Set up logging
@@ -30,11 +30,10 @@ async def interact(connection):
     connection.send("Bye.\n")
 
 
-def main():
+async def main():
     server = TelnetServer(interact=interact, port=2323)
-    server.start()
-    get_event_loop().run_forever()
+    await server.run()
 
 
 if __name__ == "__main__":
-    main()
+    run(main())

examples/telnet/toolbar.py

@@ -4,10 +4,10 @@
 in the prompt.
 """
 import logging
+from asyncio import Future, run
 
 from prompt_toolkit.completion import WordCompleter
 from prompt_toolkit.contrib.telnet.server import TelnetServer
-from prompt_toolkit.eventloop import get_event_loop
 from prompt_toolkit.shortcuts import PromptSession
 
 # Set up logging
@@ -35,11 +35,10 @@ def get_toolbar():
     connection.send("Bye.\n")
 
 
-def main():
+async def main():
     server = TelnetServer(interact=interact, port=2323)
-    server.start()
-    get_event_loop().run_forever()
+    await server.run()
 
 
 if __name__ == "__main__":
-    main()
+    run(main())

setup.py

@@ -30,26 +30,16 @@ def get_version(package):
     package_dir={"": "src"},
     package_data={"prompt_toolkit": ["py.typed"]},
     install_requires=["wcwidth"],
-    # We require Python 3.6.2 for three reasons:
-    # - Syntax for variable annotations - PEP 526.
-    # - Asynchronous generators - PEP 525.
-    # - New type annotations in 3.6.2 (i.e. NoReturn)
-    # Also, 3.6.0 doesn't have `typing.AsyncGenerator` yet. 3.6.1 does.
-    # Python 3.7 is suggested, because:
+    # We require Python 3.7, because we need:
     # - Context variables - PEP 567
-    # (The current application is derived from a context variable.)
-    # There is no intension to support Python 3.5, because prompt_toolkit 2.0
-    # does run fine on any older Python version starting from Python 2.6, and
-    # it is possible to write code that runs both against prompt_toolkit
-    # version 2 and 3.
-    python_requires=">=3.6.2",
+    # - `asyncio.run()`
+    python_requires=">=3.7.0",
     classifiers=[
         "Development Status :: 5 - Production/Stable",
         "Intended Audience :: Developers",
         "License :: OSI Approved :: BSD License",
         "Operating System :: OS Independent",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",

src/prompt_toolkit/__init__.py

@@ -13,6 +13,8 @@
 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

src/prompt_toolkit/application/__init__.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from .application import Application
 from .current import (
     AppSession,