strip_progressbar.py

import json

def strip_stream(filename):
    jay = json.load(open(filename))
    for cell in jay['worksheets'][0]['cells']:
        if 'outputs' in cell:
           cell['outputs'] = [x for x in cell['outputs']
                              if not (x['output_type'] == 'stream'
                                      and '\r' in x['text'])]
    with open(filename,'w') as outf:
        json.dump(jay, outf)
    return jay

jay = strip_stream()