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class SlicerClass(object):
    '''
    slicerClass allows the creation of a slicer object.
    A slicer, when indexed with square brackets, will return a slice object.
    This allows a slice to be created and neatly passed as an argument.
    '''
    def __getitem__(self,val):
        return val
    def __len__ (self):
        return 0

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from __future__ import print_function

import os, time, argparse
from subprocess import call, check_call, check_output


def stop_cmd(name):
    return ['docker', 'stop', name], False

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def online_mean():
    """
    Return an initialised generator for online mean (next() has been called).
    """
    omean = _online_mean()
    next(omean)
    return omean


def _online_mean():

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"""
An example of using the `yield from` syntax in python 3 and a generator expression than mimics this.
"""

def yield_only_odd(i):
    '''
    Yield i if and only if i is odd.
    
    This is a generator that yields zero or one times.
    '''

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# IPython magic to check for PEP8 compliance.
# Author: Juan Luis Cano <juanlu001@gmail.com>

"""IPython magic to check for PEP8 compliance.

To use it, type

```%load_ext pep8magic```

and then

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import random
 
 
def get_haiku(n_adj=1, sep='-'):
    '''
    return short haiku, seperated by sep.
    
    Original from https://gist.github.com/afriggeri/1266756
    '''
    adjs = [

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import math


def num_fmt(num):
    i_offset = 24 # change this if you extend the symbols!!!
    prec = 3
    fmt = '.{p}g'.format(p=prec)
    symbols = ['Y', 'Z', 'E', 'P', 'T', 'G', 'M', 'k', '', 'm', 'u', 'n']
    
    e = math.log10(abs(num))