Cyclomatic complexity is too high in function check_arguments. (13) Open
def check_arguments(args):
"""
Validates the arguments passed through the CLI commands.
:param args: The arguments passed in the CLI, parsed by the docopt module
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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. |
Function check_arguments
has a Cognitive Complexity of 14 (exceeds 5 allowed). Consider refactoring. Open
def check_arguments(args):
"""
Validates the arguments passed through the CLI commands.
:param args: The arguments passed in the CLI, parsed by the docopt module
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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
Merge this if statement with the enclosing one. Open
if args['--output_type'] not in ['json', 'csv']:
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Merging collapsible if
statements increases the code's readability.
Noncompliant Code Example
if condition1: if condition2: # ...
Compliant Solution
if condition1 and condition2: # ...
Merge this if statement with the enclosing one. Open
if projectname_re.search(args['<projectname>']) is not None:
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Merging collapsible if
statements increases the code's readability.
Noncompliant Code Example
if condition1: if condition2: # ...
Compliant Solution
if condition1 and condition2: # ...
Indentation contains tabs Open
"""Exception class for invalid in arguments."""
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
:param args: The arguments passed in the CLI, parsed by the docopt module
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Okay: if True:\n return
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projectname_re = re.compile(r'[^a-zA-Z0-9_]')
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Indentation contains tabs Open
])
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
Validates the arguments passed through the CLI commands.
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
:return: None
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Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
pass
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Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
pass
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
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if int(args['--levels']) < 1:
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"""Exception class for invalid type in arguments."""
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Indentation contains tabs Open
message = " ".join([
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"""Exception class for invalid levels in arguments."""
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if projectname_re.search(args['<projectname>']) is not None:
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message = "--levels should be greater than, or equal to 1"
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Indentation contains tabs Open
"""Exception class for invalid output_type in arguments."""
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pass
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W191: if True:\n\treturn
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if args['genconfig'] or args['generate'] or args['run']:
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pass
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raise InvalidType("--type has to be 'scraper' or 'crawler'")
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Indentation contains tabs Open
"{}".format(type(args['--levels']))
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except (TypeError, ValueError):
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if args['--selector'] not in ['xpath', 'css']:
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raise InvalidProjectName(message)
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"--levels should be an integer and not of type",
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Okay: if True:\n return
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raise InvalidLevels(message)
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Okay: if True:\n return
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Indentation contains tabs Open
"""Exception class for invalid <projectname> in arguments."""
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
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Indentation contains tabs Open
"""
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
if args['generate'] or args['run']:
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
try:
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
if args['genconfig']:
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
if args['--output_type'] not in ['json', 'csv']:
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
raise InvalidOutputType("--output_type has to be 'json' or 'csv'")
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
raise InvalidLevels(message)
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
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pass
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
"""
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
if args['--type'] not in ['scraper', 'crawler']:
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- Exclude checks
On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
raise InvalidSelector("--selector has to be 'xpath' or 'css'")
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn
Indentation contains tabs Open
message = "<projectname> should consist of letters, digits or _"
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On new projects, spaces-only are strongly recommended over tabs.
Okay: if True:\n return
W191: if True:\n\treturn