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Godley/Music-Library

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implementation/primaries/ExtractMetadata/classes/helpers.py

Summary

Maintainability
A
45 mins
Test Coverage

Cyclomatic complexity is too high in function combine_dictionaries. (6)
Open

def combine_dictionaries(dict1, dict2):
    new_dict = dict1
    for key in dict2:
        if key not in new_dict:
            new_dict[key] = dict2[key]
Severity: Minor
Found in implementation/primaries/ExtractMetadata/classes/helpers.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 combine_dictionaries has a Cognitive Complexity of 8 (exceeds 5 allowed). Consider refactoring.
Open

def combine_dictionaries(dict1, dict2):
    new_dict = dict1
    for key in dict2:
        if key not in new_dict:
            new_dict[key] = dict2[key]
Severity: Minor
Found in implementation/primaries/ExtractMetadata/classes/helpers.py - About 45 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

Line too long (85 > 79 characters)
Open

    Initialise a key in a dictionary with a default value if it doesn't exist already
Severity: Minor
Found in implementation/primaries/ExtractMetadata/classes/helpers.py by pep8

Limit all lines to a maximum of 79 characters.

There are still many devices around that are limited to 80 character
lines; plus, limiting windows to 80 characters makes it possible to
have several windows side-by-side.  The default wrapping on such
devices looks ugly.  Therefore, please limit all lines to a maximum
of 79 characters. For flowing long blocks of text (docstrings or
comments), limiting the length to 72 characters is recommended.

Reports error E501.

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