Extensions System

def initialize(linter):
    """
    Standard extension initialization function.
    
    Each extension module must provide this function to register
    its checkers with the linter.
    
    Args:
        linter: PyLinter instance to register checkers with
    """

# Extension loading patterns
def register(linter):
    """Alternative registration function name."""
    pass

def load_configuration(linter):
    """Load extension-specific configuration."""
    pass

# Code style enhancements
import pylint.extensions.code_style
# - Additional naming convention checks
# - Enhanced formatting validation
# - Style consistency enforcement

# Empty comment detection
import pylint.extensions.empty_comment
# - Detect and flag empty comment lines
# - Configurable comment content validation

# Bad builtin usage
import pylint.extensions.bad_builtin
# - Flag usage of problematic builtin functions
# - Suggest better alternatives
# - Configurable builtin blacklist

# McCabe complexity analysis
import pylint.extensions.mccabe
# - Cyclomatic complexity calculation
# - Configurable complexity thresholds
# - Function and method complexity limits

# Broad try clause detection
import pylint.extensions.broad_try_clause
# - Detect overly broad try blocks
# - Encourage specific exception handling
# - Configurable try block size limits

# Docstring parameter validation
import pylint.extensions.docparams
# - Validate docstring parameters match function signature
# - Check parameter descriptions
# - Validate return value documentation
# - Support for multiple docstring formats (Google, NumPy, Sphinx)

# Docstring style checking
import pylint.extensions.docstyle
# - Docstring format validation
# - Style consistency checking
# - Missing docstring detection enhancement

# Enhanced type checking
import pylint.extensions.typing
# - Additional type annotation validation
# - Generic type usage checking
# - Type compatibility analysis
# - Protocol and TypedDict validation

# Equality without hash detection
import pylint.extensions.eq_without_hash
# - Detect classes with __eq__ but no __hash__
# - Flag potential dictionary/set usage issues
# - Suggest proper hash implementation

# Set membership optimization
import pylint.extensions.set_membership
# - Detect inefficient membership testing
# - Suggest set/frozenset for O(1) lookups
# - Flag repeated list/tuple membership checks

# For/any/all pattern detection
import pylint.extensions.for_any_all
# - Suggest using any() or all() instead of loops
# - Detect common iteration patterns
# - Performance optimization suggestions

# Elif condition analysis
import pylint.extensions.check_elif
# - Validate elif condition logic
# - Detect unreachable elif branches
# - Suggest condition simplification

# Confusing elif detection
import pylint.extensions.confusing_elif
# - Flag potentially confusing elif structures
# - Suggest clearer conditional logic
# - Detect overlapping conditions

# Ternary expression suggestions
import pylint.extensions.consider_ternary_expression
# - Suggest ternary operators for simple if/else
# - Improve code conciseness
# - Configurable complexity thresholds

# Private import detection
import pylint.extensions.private_import
# - Detect imports from private modules
# - Flag underscore-prefixed imports
# - Validate API boundary respect

# Overlapping exception detection
import pylint.extensions.overlapping_exceptions
# - Detect overlapping exception handlers
# - Flag unreachable except clauses
# - Suggest exception hierarchy improvements

# Redefined variable type detection
import pylint.extensions.redefined_variable_type
# - Detect variables assigned different types
# - Flag potential type confusion
# - Suggest consistent typing patterns

# Unused self parameter detection
import pylint.extensions.no_self_use
# - Detect methods that don't use self
# - Suggest staticmethod or function conversion
# - Configurable whitelist patterns

# Magic value detection
import pylint.extensions.magic_value
# - Detect magic numbers and strings
# - Suggest named constants
# - Configurable value whitelists
# - Context-aware detection

# Zero comparison optimization
import pylint.extensions.comparetozero
# - Detect inefficient zero comparisons
# - Suggest truthiness testing
# - Flag explicit None comparisons

# No else return pattern
import pylint.extensions.no_else_return
# - Detect unnecessary else after return
# - Suggest early return patterns
# - Improve code flow readability

from pylint.lint import PyLinter

# Load extension programmatically
linter = PyLinter()
from pylint.extensions import mccabe
mccabe.initialize(linter)

# Load multiple extensions
extensions = [
    'pylint.extensions.mccabe',
    'pylint.extensions.docparams', 
    'pylint.extensions.code_style'
]

for ext_name in extensions:
    linter.load_plugin(ext_name)

# Load single extension
pylint --load-plugins=pylint.extensions.mccabe mymodule.py

# Load multiple extensions
pylint --load-plugins=mccabe,docparams,code_style mymodule.py

# Load all available extensions
pylint --load-plugins=pylint.extensions mymodule.py

# McCabe complexity configuration
linter.config.max_complexity = 10

# Docparams configuration
linter.config.accept_no_param_doc = False
linter.config.accept_no_raise_doc = False
linter.config.accept_no_return_doc = False
linter.config.accept_no_yields_doc = False

# Magic value configuration
linter.config.valid_magic_values = [-1, 0, 1, 2]
linter.config.valid_magic_strings = ['', 'utf-8', 'ascii']

# Creating a custom extension
from pylint.checkers import BaseChecker
from pylint.interfaces import IAstroidChecker

class CustomExtensionChecker(BaseChecker):
    """Custom extension checker example."""
    
    __implements__ = IAstroidChecker
    
    name = 'custom-extension'
    msgs = {
        'C9900': (
            'Custom extension message: %s',
            'custom-extension-message',
            'Description of custom extension check'
        )
    }
    
    options = (
        ('custom-option', {
            'default': True,
            'type': 'yn',
            'help': 'Enable custom extension behavior'
        }),
    )
    
    def visit_functiondef(self, node):
        """Custom analysis logic."""
        if self.config.custom_option:
            # Perform custom analysis
            self.add_message('custom-extension-message', 
                           node=node, args=(node.name,))

def initialize(linter):
    """Register the custom extension."""
    linter.register_checker(CustomExtensionChecker(linter))

# pylint.extensions.docparams
# - missing-param-doc: Missing parameter documentation
# - missing-type-doc: Missing parameter type documentation  
# - missing-return-doc: Missing return documentation
# - missing-return-type-doc: Missing return type documentation
# - missing-raises-doc: Missing exception documentation

# pylint.extensions.docstyle  
# - docstring-first-line-empty: Empty first docstring line
# - docstring-min-length: Docstring too short

# pylint.extensions.mccabe
# - too-complex: Function/method too complex

# pylint.extensions.code_style
# - consider-using-assignment-expr: Consider using assignment expression
# - consider-using-namedtuple-or-dataclass: Consider namedtuple/dataclass

# pylint.extensions.magic_value
# - magic-value-comparison: Magic value used in comparison

# pylint.extensions.set_membership
# - use-set-for-membership: Use set for membership testing

# pylint.extensions.for_any_all
# - consider-using-any-or-all: Consider using any() or all()

# pylint.extensions.consider_ternary_expression
# - consider-ternary-expression: Consider using ternary expression

# pylint.extensions.confusing_elif
# - confusing-elif: Confusing elif condition

# .pylintrc configuration
[DESIGN]
max-complexity = 10

[MESSAGES CONTROL]
enable = too-complex

[PARAMETER_DOCUMENTATION]
accept-no-param-doc = no
accept-no-raise-doc = no
accept-no-return-doc = no
accept-no-yields-doc = no
default-docstring-type = sphinx

[MAGIC_VALUE]
valid-magic-values = -1,0,1,2,100,1000
valid-magic-strings = '',utf-8,ascii,latin-1