tqdm_notebook erroring out since 4.16.0 #441
Description
Hey,
I came across an issue while using tqdm_notebook(total=123, desc="my description") in a Jupyter notebook. I'm running into the following error. This only happens beginning with version 4.16.0 (4.15.0 seems to work):
~/.virtualenvs/venv/lib/python3.6/site-packages/tqdm/_tqdm_notebook.py in __init__(self, *args, **kwargs)
186 # Print initial bar state
187 if not self.disable:
--> 188 self.sp(self.__repr__()) # same as self.refresh without clearing
189
190 def __iter__(self, *args, **kwargs):
~/.virtualenvs/venv/lib/python3.6/site-packages/tqdm/_tqdm.py in __repr__(self)
839 self.unit, self.unit_scale,
840 1 / self.avg_time if self.avg_time else None,
--> 841 self.bar_format, self.postfix)
842
843 def __lt__(self, other):
~/.virtualenvs/venv/lib/python3.6/site-packages/tqdm/_tqdm.py in format_meter(n, total, elapsed, ncols, prefix, ascii, unit, unit_scale, rate, bar_format, postfix, unit_divisor)
307
308 # format the stats displayed to the left and right sides of the bar
--> 309 bool_prefix_colon_already = (prefix[-2:] == ": ") # old prefix setup work around
310 if prefix:
311 l_bar = prefix if bool_prefix_colon_already else prefix + ": "
TypeError: 'NoneType' object is not subscriptable
I started tracing through this and saw that in _tqdm_notebook.py around line 184 (as of version 4.17.0) we set self.desc to none before calling self.__repr__:
self.desc = None # trick to place description before the bar
# Print initial bar state
if not self.disable:
self.sp(self.__repr__()) # same as self.refresh without clearingSeems related but I'm not sure what would be the right fix since the logic seems fairly involved.
I'm running:
Python 3.6.1
Jupyter 4.3.0
tqdm 4.17.0