Python command line progress bar in 25 lines of code that allows you to wrap your for loop.

progress.py

# The MIT License (MIT)
# Copyright (c) 2016 Vladimir Ignatev
#
# Permission is hereby granted, free of charge, to any person obtaining 
# a copy of this software and associated documentation files (the "Software"), 
# to deal in the Software without restriction, including without limitation 
# the rights to use, copy, modify, merge, publish, distribute, sublicense, 
# and/or sell copies of the Software, and to permit persons to whom the Software 
# is furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included 
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 
# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
# FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
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# OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import sys


def progress(iterable, total=None, status_func=lambda: ''):
    """ Usage
    for item in progress(items, total=len(items), status_func=generate_status):
      pass
    """
    bar_len = 60
    count = 0
    if total is None:
        total = len(iterable)  # if this fails because it is an iterator or something, you must pass in total

    def _print_progress_bar():
        filled_len = int(round(bar_len * count / float(total)))
        percents = round(100.0 * count / float(total), 1)
        bar = '=' * filled_len + '-' * (bar_len - filled_len)
        sys.stdout.write('[%s] %s%s ...%s\r' % (bar, percents, '%', status_func()))
        sys.stdout.flush()  # As suggested by Rom Ruben (see: http://stackoverflow.com/questions/3173320/text-progress-bar-in-the-console/27871113#comment50529068_27871113)

    try:
        while 1:
            item = next(iterable)
            yield item
            count += 1
            _print_progress_bar()
    except StopIteration:
        _print_progress_bar()
        sys.stdout.write('\n')
        sys.stdout.flush()