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#!/usr/bin/env python
"""
Simple example of a custom, very slow history, that is loaded asynchronously.
By wrapping it in `ThreadedHistory`, the history will load in the background
without blocking any user interaction.
"""
import time
from prompt_toolkit import PromptSession
from prompt_toolkit.history import History, ThreadedHistory
class SlowHistory(History):
"""
Example class that loads the history very slowly...
"""
def load_history_strings(self):
for i in range(1000):
time.sleep(1) # Emulate slowness.
yield f"item-{i}"
def store_string(self, string):
pass # Don't store strings.
def main():
print(
"Asynchronous loading of history. Notice that the up-arrow will work "
"for as far as the completions are loaded.\n"
"Even when the input is accepted, loading will continue in the "
"background and when the next prompt is displayed.\n"
)
our_history = ThreadedHistory(SlowHistory())
# The history needs to be passed to the `PromptSession`. It can't be passed
# to the `prompt` call because only one history can be used during a
# session.
session = PromptSession(history=our_history)
while True:
text = session.prompt("Say something: ")
print(f"You said: {text}")
if __name__ == "__main__":
main()
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