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-rwxr-xr-xexamples/progress-bar/unknown-length.py26
1 files changed, 26 insertions, 0 deletions
diff --git a/examples/progress-bar/unknown-length.py b/examples/progress-bar/unknown-length.py
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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()