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bomquote/transistor

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transistor/persistence/exporters/exporters.py

Summary

Maintainability
A
1 hr
Test Coverage

Consider possible security implications associated with pickle module.
Open

import pickle
Severity: Info
Found in transistor/persistence/exporters/exporters.py by bandit

Cyclomatic complexity is too high in method _serialize_value. (7)
Open

    def _serialize_value(self, value):
        if isinstance(value, BaseItem):
            return self.export_item(value)
        if isinstance(value, dict):
            return dict(self._serialize_dict(value))
Severity: Minor
Found in transistor/persistence/exporters/exporters.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 _write_headers_and_set_fields_to_export has a Cognitive Complexity of 7 (exceeds 5 allowed). Consider refactoring.
Open

    def _write_headers_and_set_fields_to_export(self, item):
        if self.include_headers_line:
            if not self.fields_to_export:
                if isinstance(item, dict):
                    # for dicts try using fields of the first item
Severity: Minor
Found in transistor/persistence/exporters/exporters.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

Avoid too many return statements within this function.
Open

        return value
Severity: Major
Found in transistor/persistence/exporters/exporters.py - About 30 mins to fix

    At least two spaces before inline comment
    Open

                newline='' # Windows needs this https://github.com/scrapy/scrapy/issues/3034
    Severity: Minor
    Found in transistor/persistence/exporters/exporters.py by pep8

    Separate inline comments by at least two spaces.

    An inline comment is a comment on the same line as a statement.
Inline comments should be separated by at least two spaces from the
statement. They should start with a # and a single space.

Each line of a block comment starts with a # and a single space
(unless it is indented text inside the comment).

Okay: x = x + 1  # Increment x
Okay: x = x + 1    # Increment x
Okay: # Block comment
E261: x = x + 1 # Increment x
E262: x = x + 1  #Increment x
E262: x = x + 1  #  Increment x
E265: #Block comment
E266: ### Block comment

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