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>>> m = [[]] * 10
>>> m
[[], [], [], [], [], [], [], [], [], []]
>>> #everything seems to be OK
... 
>>> m[0].append(10)
>>> m
[[10], [10], [10], [10], [10], [10], [10], [10], [10], [10]]
>>> #shit!
... 

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import time


class TicToc:
    """ A simple stopwatch object"""
    def __init__(self, name=None, start=True):
        if name is None:
            name = 'Running time'
        self.name = name
        self.dt = 0.0

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from __future__ import print_function
import numpy as np
def asciihist(it, bins=10, minmax=None, str_tag='',
              scale_output=30, generate_only=False, print_function=print):
    """Create an ASCII histogram from an interable of numbers.

    Author: Boris Gorelik [email protected]. based on  http://econpy.googlecode.com/svn/trunk/pytrix/pytrix.py
    License: MIT
    """
    ret = []

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np.random.seed(123456)
N = 100
aim = 0
scale = 0.5
adjusted = []
for i in range(N):
    curr = np.random.randn() * scale + aim
    adjusted.append(curr)
    aim = -curr
non_adjusted = np.random.randn(N)*scale

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