User:Praveer-mathur-9f3d@uni-bonn.de/python-on-hpc

Short Quiz: Python Packages

Which of these locations will Python search for packages by default?

	Anything that is in $PYTHONPATH
	Anything in your home
	Preconfigured Site Packages
	The current working directory

Short Quiz: Virtual Environments

Which of the following statements is true?

	venv comes with Python
	Virtual environments always go to ~/.virtualenvs
	Each virtual env always has its own Python instance
	The activate script has to be source-d to activate the venv
	The deactivate script has to be source-d to deactivate the venv

Short Quiz: Conda vs. Pip

To which package manager do the statements apply? pip, conda, neither or both?

"Non-Python packages available by default"

	Pip
	Conda
	Both of them
	Neither of them

"Tightly integrated with its own virtual environment feature"

	Pip
	Conda
	Both of them
	Neither of them

"Built-in third-party package repositories"

	Pip
	Conda
	Both of them
	Neither of them

"Installs new Python executable into env by default"

	Pip
	Conda
	Both of them
	Neither of them

"Automatically installs dependencies for requested package"

	Pip
	Conda
	Both of them
	Neither of them

"Requires you to specify package version"

	Pip
	Conda
	Both of them
	Neither of them

Short Quiz: Arrays and Performance

What should you always do before you optimize your code's performance? (Hard to implement).

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Short Quiz: Array Memory Layout

Which index varies fastest in a row-major layout, which varies fastest in a column-major layout? (Hard to implement).

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Which ordering do NumPy arrays have by default? More than one answer may be correct.

	C order
	Fortran order
	Column-major
	Row-major

Short Quiz: Array Shapes, Broadcasting

Consider the following code. What does each print statement output? Could be an error. Treat all print statements independently. (Hard to implement)

x = np.zeros(5)
y = np.zeros((3, 5))
z = np.zeros((5, 3, 1))

print((x + y).shape)

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print((x + z).shape)

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print((y + z).shape)

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print(y[:2, :2].shape)

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print(y[:2].shape)

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print((y[:2] + x[:2]).shape)

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print((y[..., np.newaxis] + z).shape)

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print((y.ravel() + x[0]).shape)

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Short Quiz: Advanced Indexing

Consider the following code. What does each print statement output? Could be an error. Treat all print statements independently. (Hard to implement)

a = np.array([[1, 2, 3] [4, 5, 6]])
idx = np.array([0, 0])
mask = np.array([False, True, True])

print(a[idx])

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print(a[:, idx])

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print(a[idx, :])

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a[:, mask] = -1
print(a)

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