Fix imports

[magsol]

Import statements in Python files need to follow three guidelines:

• Imports should be listed in alphabetical order by root package name, then all subpackages.

For example:

import numpy as np
import numpy.testing
import numpy.linalg as sla
import argparse

is incorrect. The correct ordering would be:

import argparse
import numpy as np
import numpy.linalg as sla
import numpy.testing

• No comments or commented-out import statements.
• Do not use from package import function, as this creates potential namespace collisions. Rather, use the import package.subpackage as alias syntax.

For example:

from numpy import linalg as sla

is incorrect. Rather, use this formulation:

import numpy.linalg as sla

[MOJTABAFA]

Thanks for elaborating such technical issues. It's already done.