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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 time
from prompt_toolkit.shortcuts import ProgressBar
def data():
"""
A generator that produces items. len() doesn't work here, so the progress
bar can't estimate the time it will take.
"""
yield from range(1000)
def main():
with ProgressBar() as pb:
for i in pb(data()):
time.sleep(0.1)
if __name__ == "__main__":
main()
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