Calling repr on current thread leads to RecursionError #4172
Description
Summary
Calling str or repr on current thread leads to RecursionError: maximum recursion depth exceeded while getting the repr of an object
Steps to reproduce
Code snippet:
import streamlit as st
import threading
thread = threading.current_thread()
st.info('Weird case %s' % thread)
Steps to reproduce the bug:
- Save above code as app.py
- Run
streamlit run app.py
Expected behavior:
The current thread details should be shown.
$ python -c "import threading; thread = threading.current_thread(); print('%s' % thread)"
<_MainThread(MainThread, started 140179378095936)>
Actual behavior:
We get a RecursionError:
$ streamlit run app.py
You can now view your Streamlit app in your browser.
Local URL: http://localhost:8501
Network URL: http://<ipv4>:8501
2021-12-14 13:25:08.486 Traceback (most recent call last):
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/script_runner.py", line 354, in _run_script
exec(code, module.__dict__)
File "/u/foo/st_reproducer/app.py", line 5, in <module>
st.info('Weird case %s' % thread)
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/report_thread.py", line 209, in __repr__
return util.repr_(self)
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/util.py", line 106, in repr_
args = ", ".join([f"{k}={repr(v)}" for (k, v) in cls.__dict__.items()])
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/util.py", line 106, in <listcomp>
args = ", ".join([f"{k}={repr(v)}" for (k, v) in cls.__dict__.items()])
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/script_runner.py", line 137, in __repr__
return util.repr_(self)
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/util.py", line 106, in repr_
args = ", ".join([f"{k}={repr(v)}" for (k, v) in cls.__dict__.items()])
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/util.py", line 106, in <listcomp>
args = ", ".join([f"{k}={repr(v)}" for (k, v) in cls.__dict__.items()])
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/report_thread.py", line 209, in __repr__
return util.repr_(self)
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/util.py", line 106, in repr_
args = ", ".join([f"{k}={repr(v)}" for (k, v) in cls.__dict__.items()])
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/util.py", line 106, in <listcomp>
args = ", ".join([f"{k}={repr(v)}" for (k, v) in cls.__dict__.items()])
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/script_runner.py", line 137, in __repr__
return util.repr_(self)
...
...
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/util.py", line 106, in repr_
args = ", ".join([f"{k}={repr(v)}" for (k, v) in cls.__dict__.items()])
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/util.py", line 106, in <listcomp>
args = ", ".join([f"{k}={repr(v)}" for (k, v) in cls.__dict__.items()])
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/report.py", line 99, in __repr__
return util.repr_(self)
File "/usr/local/python/python-3.9/latest/lib64/python3.9/site-packages/streamlit/util.py", line 106, in repr_
args = ", ".join([f"{k}={repr(v)}" for (k, v) in cls.__dict__.items()])
RecursionError: maximum recursion depth exceeded while calling a Python object
Is this a regression?
I do not think so. Able to reproduce this with at least one Streamlit version<1.1.0 as well as under Python 3.7.
Debug info
- Streamlit version: 1.1.0
- Python version: 3.9.7
- Installed using pip
- OS version: Red Hat Enterprise Linux Server release 7.9 (Maipo)
- Browser version: Chrome 96.0
Additional information
This is preventing us from using packages which internally calls repr(thread), so any workaround suggestion would also be good to know until there is a fix.