1 files changed, 26 insertions, 0 deletions
diff --git a/examples/progress-bar/unknown-length.py b/examples/progress-bar/unknown-length.py
new file mode 100755
index 0000000..e39ac39
--- /dev/null
+++ b/examples/progress-bar/unknown-length.py
@@ -0,0 +1,26 @@
+#!/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()