>> for _ in tqdm_notebook(range(10), ncols='400px', bar_format='{bar}'):
>>    sleep(0.1)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-3-aced8917afa9> in <module>()
      1 # px ncols
----> 2 for _ in tqdm_notebook(range(10),ncols='400px', bar_format='{bar}'): #400px
      3     sleep(0.1)

/usr/local/anaconda/lib/python3.6/site-packages/tqdm/__init__.py 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 

/usr/local/anaconda/lib/python3.6/site-packages/tqdm/_tqdm_notebook.py in __init__(self, *args, **kwargs)
    203         # Print initial bar state
    204         if not self.disable:
--> 205             self.sp(self.__repr__())  # same as self.refresh without clearing
    206 
    207     def __iter__(self, *args, **kwargs):

/usr/local/anaconda/lib/python3.6/site-packages/tqdm/_tqdm.py in __repr__(self, elapsed)
    890             self.desc, self.ascii, self.unit,
    891             self.unit_scale, 1 / self.avg_time if self.avg_time else None,
--> 892             self.bar_format, self.postfix, self.unit_divisor)
    893 
    894     @property

/usr/local/anaconda/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)
    363             # Formatting progress bar
    364             # space available for bar's display
--> 365             N_BARS = max(1, ncols - len(l_bar) - len(r_bar)) if ncols \
    366                 else 10
    367 

TypeError: unsupported operand type(s) for -: 'str' and 'int'

>> print(tqdm.__version__, sys.version, sys.platform)
4.24.0 3.6.2 |Anaconda custom (64-bit)| (default, Sep 30 2017, 18:42:57) 
[GCC 7.2.0] linux