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?

Short Quiz: Virtual Environments

Which of the following statements is true?

Short Quiz: Conda vs. Pip

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

"Non-Python packages available by default"

"Tightly integrated with its own virtual environment feature"

"Built-in third-party package repositories"

"Installs new Python executable into env by default"

"Automatically installs dependencies for requested package"

"Requires you to specify package version"

Short Quiz: Arrays and Performance

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

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).

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

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)

print((x + z).shape)

print((y + z).shape)

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

print(y[:2].shape)

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

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

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

Short Quiz: Advanced Indexing

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

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

print(a[idx])

print(a[:, idx])

print(a[idx, :])

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

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

	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

	C order
	Fortran order
	Column-major
	Row-major