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Cyclomatic complexity is too high in function main. (7)

@click.option('-h', '--host', help='host on which the server should listen on',
              default="localhost", type=str, show_default=True)
@click.option('-p', '--port', help='port on which the server should listen on, [default: 9000]',
              default=None, type=int)
Severity: Minor
Found in src/libertem/web/ 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.


Function "main" has 8 parameters, which is greater than the 7 authorized.

def main(port, local_directory, browser, log_level, insecure, host="localhost",
        token_path=None, preload: Tuple[str, ...] = ()):
Severity: Major
Found in src/libertem/web/ 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):

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