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Fix example for progress bar with custom iterable
When I tried the example as it was, I got the following exception: ``` $ python3 /tmp/try_prompt.py 0.0% [> ] 0/1000 eta [?:??:??] Traceback (most recent call last): File "/tmp/try_prompt.py", line 8, in <module> for i in pb(some_iterable, total=1000): File "/home/pradeep/.pyenv/versions/3.10.8/lib/python3.10/site-packages/prompt_toolkit/shortcuts/progress_bar/base.py", line 353, in __iter__ for item in self.data: TypeError: 'function' object is not iterable ``` After changing the iterable to `some_iterable()`, things worked as expected: ``` $ python3 /tmp/try_prompt.py 0.1% [====================================================================================================================>] 1/1000 eta [00:00] ```
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