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#!/usr/bin/env python
"""
A very simple progress bar which keep track of the progress as we consume an
iterator.
"""
import os
import signal
import time
from prompt_toolkit import HTML
from prompt_toolkit.key_binding import KeyBindings
from prompt_toolkit.patch_stdout import patch_stdout
from prompt_toolkit.shortcuts import ProgressBar
def main():
bottom_toolbar = HTML(
' <b>[f]</b> Print "f" <b>[q]</b> Abort <b>[x]</b> Send Control-C.'
)
# Create custom key bindings first.
kb = KeyBindings()
cancel = [False]
@kb.add("f")
def _(event):
print("You pressed `f`.")
@kb.add("q")
def _(event):
"Quit by setting cancel flag."
cancel[0] = True
@kb.add("x")
def _(event):
"Quit by sending SIGINT to the main thread."
os.kill(os.getpid(), signal.SIGINT)
# Use `patch_stdout`, to make sure that prints go above the
# application.
with patch_stdout():
with ProgressBar(key_bindings=kb, bottom_toolbar=bottom_toolbar) as pb:
for i in pb(range(800)):
time.sleep(0.01)
if cancel[0]:
break
if __name__ == "__main__":
main()
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