What's the difference between tuples/lists and what are their advantages/disadvantages?

In unittest, I can setUp variables in a class and then the methods of this class can chose whichever variable it wants to use... class test_class(unittest.TestCase): def setUp(self): self.varA = 1 self.varB = 2 self.varC = 3 self.modified_varA = 2 def test_1(self): do_something_with_self.varA, self.varB def test_2(self): do_something_with_self_modified_varA, self.varC So in unittest, it was easy t

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I have this error for trying to load a saved SVM model. I have tried uninstalling sklearn, NumPy and SciPy, reinstalling the latest versions all-together again (using pip). I am still getting this error. Why? In [1]: import sklearn; print sklearn.__version__ 0.18.1 In [3]: import numpy; print numpy.__version__ 1.11.2 In [5]: import scipy; print scipy.__version__ 0.18.1 In [7]: import pandas; print

I am trying to save plots I make using matplotlib; however, the images are saving blank. Here is my code: plt.subplot(121) plt.imshow(dataStack, cmap=mpl.cm.bone) plt.subplot(122) y = copy.deepcopy(tumorStack) y = np.ma.masked_where(y == 0, y) plt.imshow(dataStack, cmap=mpl.cm.bone) plt.imshow(y, cmap=mpl.cm.jet_r, interpolation='nearest') if T0 is not None: plt.subplot(123) plt.imshow(T0, cmap=mp