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qutip/solver/steadystate.py

Summary

Maintainability
A
35 mins
Test Coverage

Function steadystate has a Cognitive Complexity of 22 (exceeds 20 allowed). Consider refactoring.
Open

def steadystate(A, c_ops=[], *, method='direct', solver=None, **kwargs):
    """
    Calculates the steady state for quantum evolution subject to the supplied
    Hamiltonian or Liouvillian operator and (if given a Hamiltonian) a list of
    collapse operators.
Severity: Minor
Found in qutip/solver/steadystate.py - About 35 mins to fix

Cognitive Complexity

Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

A method's cognitive complexity is based on a few simple rules:

  • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
  • Code is considered more complex for each "break in the linear flow of the code"
  • Code is considered more complex when "flow breaking structures are nested"

Further reading

Ambiguous variable name 'i'
Open

    I = _data.identity_like(P)
Severity: Minor
Found in qutip/solver/steadystate.py by pep8

Never use the characters 'l', 'O', or 'I' as variable names.

In some fonts, these characters are indistinguishable from the
numerals one and zero. When tempted to use 'l', use 'L' instead.

Okay: L = 0
Okay: o = 123
Okay: i = 42
E741: l = 0
E741: O = 123
E741: I = 42

Variables can be bound in several other contexts, including class
and function definitions, 'global' and 'nonlocal' statements,
exception handlers, and 'with' and 'for' statements.
In addition, we have a special handling for function parameters.

Okay: except AttributeError as o:
Okay: with lock as L:
Okay: foo(l=12)
Okay: for a in foo(l=12):
E741: except AttributeError as O:
E741: with lock as l:
E741: global I
E741: nonlocal l
E741: def foo(l):
E741: def foo(l=12):
E741: l = foo(l=12)
E741: for l in range(10):
E742: class I(object):
E743: def l(x):

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