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src/libertem/io/dataset/dm_single.py

Summary

Maintainability
B
6 hrs
Test Coverage

Use of assert detected. The enclosed code will be removed when compiling to optimised byte code.
Open

        assert self._raw_dtype is not None and not isinstance(self._raw_dtype, int)
Severity: Info
Found in src/libertem/io/dataset/dm_single.py by bandit

Use of assert detected. The enclosed code will be removed when compiling to optimised byte code.
Open

                assert ndims in (2, 3)
Severity: Info
Found in src/libertem/io/dataset/dm_single.py by bandit

Function _read_metadata has a Cognitive Complexity of 29 (exceeds 5 allowed). Consider refactoring.
Open

    def _read_metadata(cls, path, use_ds=None):
        with ncempy.io.dm.fileDM(path, on_memory=True) as fp:
            tags = fp.allTags
            array_map = {}
            start_from = 1 if fp.thumbnail else 0
Severity: Minor
Found in src/libertem/io/dataset/dm_single.py - About 4 hrs 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

Cyclomatic complexity is too high in method _read_metadata. (20)
Open

    @classmethod
    def _read_metadata(cls, path, use_ds=None):
        with ncempy.io.dm.fileDM(path, on_memory=True) as fp:
            tags = fp.allTags
            array_map = {}
Severity: Minor
Found in src/libertem/io/dataset/dm_single.py by radon

Cyclomatic Complexity

Cyclomatic Complexity corresponds to the number of decisions a block of code contains plus 1. This number (also called McCabe number) is equal to the number of linearly independent paths through the code. This number can be used as a guide when testing conditional logic in blocks.

Radon analyzes the AST tree of a Python program to compute Cyclomatic Complexity. Statements have the following effects on Cyclomatic Complexity:

Construct Effect on CC Reasoning
if +1 An if statement is a single decision.
elif +1 The elif statement adds another decision.
else +0 The else statement does not cause a new decision. The decision is at the if.
for +1 There is a decision at the start of the loop.
while +1 There is a decision at the while statement.
except +1 Each except branch adds a new conditional path of execution.
finally +0 The finally block is unconditionally executed.
with +1 The with statement roughly corresponds to a try/except block (see PEP 343 for details).
assert +1 The assert statement internally roughly equals a conditional statement.
Comprehension +1 A list/set/dict comprehension of generator expression is equivalent to a for loop.
Boolean Operator +1 Every boolean operator (and, or) adds a decision point.

Source: http://radon.readthedocs.org/en/latest/intro.html

Cyclomatic complexity is too high in method initialize. (8)
Open

    def initialize(self, executor: 'JobExecutor'):
        self._filesize = executor.run_function(self._get_filesize)
        array_meta = executor.run_function(self._read_metadata,
                                           self._path,
                                           use_ds=self._dm_ds_index)
Severity: Minor
Found in src/libertem/io/dataset/dm_single.py by radon

Cyclomatic Complexity

Cyclomatic Complexity corresponds to the number of decisions a block of code contains plus 1. This number (also called McCabe number) is equal to the number of linearly independent paths through the code. This number can be used as a guide when testing conditional logic in blocks.

Radon analyzes the AST tree of a Python program to compute Cyclomatic Complexity. Statements have the following effects on Cyclomatic Complexity:

Construct Effect on CC Reasoning
if +1 An if statement is a single decision.
elif +1 The elif statement adds another decision.
else +0 The else statement does not cause a new decision. The decision is at the if.
for +1 There is a decision at the start of the loop.
while +1 There is a decision at the while statement.
except +1 Each except branch adds a new conditional path of execution.
finally +0 The finally block is unconditionally executed.
with +1 The with statement roughly corresponds to a try/except block (see PEP 343 for details).
assert +1 The assert statement internally roughly equals a conditional statement.
Comprehension +1 A list/set/dict comprehension of generator expression is equivalent to a for loop.
Boolean Operator +1 Every boolean operator (and, or) adds a decision point.

Source: http://radon.readthedocs.org/en/latest/intro.html

Function initialize has a Cognitive Complexity of 11 (exceeds 5 allowed). Consider refactoring.
Open

    def initialize(self, executor: 'JobExecutor'):
        self._filesize = executor.run_function(self._get_filesize)
        array_meta = executor.run_function(self._read_metadata,
                                           self._path,
                                           use_ds=self._dm_ds_index)
Severity: Minor
Found in src/libertem/io/dataset/dm_single.py - About 1 hr 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

Function detect_params has a Cognitive Complexity of 7 (exceeds 5 allowed). Consider refactoring.
Open

    def detect_params(cls, path: str, executor):
        pathlow = path.lower()
        if pathlow.endswith(".dm3") or pathlow.endswith(".dm4"):
            array_meta = executor.run_function(cls._read_metadata, path)
            sig_dims = array_meta['sig_dims']
Severity: Minor
Found in src/libertem/io/dataset/dm_single.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

Function _tags_to_nest has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.
Open

    def _tags_to_nest(tags: dict[str, Any]):
        tags_nest = {}
        for tag, element in tags.items():
            tag = tag.strip('.')
            _insert_to = tags_nest
Severity: Minor
Found in src/libertem/io/dataset/dm_single.py - About 25 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

Method "__init__" has 8 parameters, which is greater than the 7 authorized.
Open

        self,
        path: os.PathLike,
        nav_shape: Optional[tuple[int, ...]] = None,
        sig_shape: Optional[tuple[int, ...]] = None,
        sync_offset: int = 0,
Severity: Major
Found in src/libertem/io/dataset/dm_single.py by sonar-python

A long parameter list can indicate that a new structure should be created to wrap the numerous parameters or that the function is doing too many things.

Noncompliant Code Example

With a maximum number of 4 parameters:

def do_something(param1, param2, param3, param4, param5):
    ...

Compliant Solution

def do_something(param1, param2, param3, param4):
    ...

Refactor this function to reduce its Cognitive Complexity from 29 to the 15 allowed.
Open

    def _read_metadata(cls, path, use_ds=None):
Severity: Critical
Found in src/libertem/io/dataset/dm_single.py by sonar-python

Cognitive Complexity is a measure of how hard the control flow of a function is to understand. Functions with high Cognitive Complexity will be difficult to maintain.

See

Either remove or fill this block of code.
Open

                pass
Severity: Major
Found in src/libertem/io/dataset/dm_single.py by sonar-python

Most of the time a block of code is empty when a piece of code is really missing. So such empty block must be either filled or removed.

Noncompliant Code Example

for i in range(3):
    pass

Exceptions

When a block contains a comment, this block is not considered to be empty.

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