tqdm's "total" parameter bug

edit

Due to something in the Sage 8.7 kernel (currently running in CoCalc), the tqdm progress bar crashes when I try to specify its total parameter. According to the documentation, my syntax should be correct. Specifically,

from tqdm import tqdm_notebook as tqdm
for i in tqdm(range(50),total=75):
    print(i)

yields

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-1-e4e61f3c450b> in <module>()
      1 from tqdm import tqdm_notebook as tqdm
----> 2 for i in tqdm(range(Integer(50)),total=Integer(75)):
      3     print(i)
/ext/sage/sage-8.7_1804/local/lib/python2.7/site-packages/tqdm/__init__.pyc in tqdm_notebook(*args, **kwargs)
     23     """See tqdm._tqdm_notebook.tqdm_notebook for full documentation"""
     24     from ._tqdm_notebook import tqdm_notebook as _tqdm_notebook
---> 25     return _tqdm_notebook(*args, **kwargs)
     26 
     27 
/ext/sage/sage-8.7_1804/local/lib/python2.7/site-packages/tqdm/_tqdm_notebook.pyc in __init__(self, *args, **kwargs)
    215         # Print initial bar state
    216         if not self.disable:
--> 217             self.sp(self.__repr__())  # same as self.refresh without clearing
    218 
    219     def __iter__(self, *args, **kwargs):
/ext/sage/sage-8.7_1804/local/lib/python2.7/site-packages/tqdm/_tqdm.pyc in __repr__(self)
    982 
    983     def __repr__(self):
--> 984         return self.format_meter(**self.format_dict)
    985 
    986     @property
/ext/sage/sage-8.7_1804/local/lib/python2.7/site-packages/tqdm/_tqdm.pyc in format_meter(n, total, elapsed, ncols, prefix, ascii, unit, unit_scale, rate, bar_format, postfix, unit_divisor, **extra_kwargs)
    395             percentage = frac * 100
    396 
--> 397             l_bar += '{0:3.0f}%|'.format(percentage)
    398 
    399             if ncols == 0:
ValueError: Unknown format code 'f' for object of type 'str'

Especially since a similar implementation of tqdm does work in a python 3 sheet, this feels like a minor bug to me. Or am I making some silly mistake?

-- edit: replaced example with a more straightforward one