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Name	Size	Permission
__pycache__	[ DIR ]	drwxr-xr-x
__init__.py	0 B	-rw-r--r--
_check_docs_utils.py	22.14 KB	-rw-r--r--
bad_builtin.py	2.38 KB	-rw-r--r--
check_docs.py	784 B	-rw-r--r--
check_elif.py	2.35 KB	-rw-r--r--
comparetozero.py	2.33 KB	-rw-r--r--
docparams.py	18.63 KB	-rw-r--r--
docstyle.py	2.84 KB	-rw-r--r--
emptystring.py	2.42 KB	-rw-r--r--
mccabe.py	6.06 KB	-rw-r--r--
overlapping_exceptions.py	3.23 KB	-rw-r--r--
redefined_variable_type.py	4.11 KB	-rw-r--r--

Code Editor : comparetozero.py

# -*- coding: utf-8 -*-
# Copyright (c) 2016 Alexander Todorov <atodorov@otb.bg>
# Copyright (c) 2017 Claudiu Popa <pcmanticore@gmail.com>

# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/master/COPYING

"""Looks for  comparisons to empty string."""

import itertools

import astroid

from pylint import interfaces
from pylint import checkers
from pylint.checkers import utils

def _is_constant_zero(node):
    return isinstance(node, astroid.Const) and node.value == 0

class CompareToZeroChecker(checkers.BaseChecker):
    """Checks for comparisons to zero.
    Most of the times you should use the fact that integers with a value of 0 are false.
    An exception to this rule is when 0 is allowed in the program and has a
    different meaning than None!
    """

__implements__ = (interfaces.IAstroidChecker,)

# configuration section name
    name = "compare-to-zero"
    msgs = {
        "C2001": (
            "Avoid comparisons to zero",
            "compare-to-zero",
            "Used when Pylint detects comparison to a 0 constant.",
        )
    }

priority = -2
    options = ()

@utils.check_messages("compare-to-zero")
    def visit_compare(self, node):
        _operators = ["!=", "==", "is not", "is"]
        # note: astroid.Compare has the left most operand in node.left
        # while the rest are a list of tuples in node.ops
        # the format of the tuple is ('compare operator sign', node)
        # here we squash everything into `ops` to make it easier for processing later
        ops = [("", node.left)]
        ops.extend(node.ops)
        ops = list(itertools.chain(*ops))

for ops_idx in range(len(ops) - 2):
            op_1 = ops[ops_idx]
            op_2 = ops[ops_idx + 1]
            op_3 = ops[ops_idx + 2]
            error_detected = False

# 0 ?? X
            if _is_constant_zero(op_1) and op_2 in _operators + ["<"]:
                error_detected = True
            # X ?? 0
            elif op_2 in _operators + [">"] and _is_constant_zero(op_3):
                error_detected = True

if error_detected:
                self.add_message("compare-to-zero", node=node)

def register(linter):
    """Required method to auto register this checker."""
    linter.register_checker(CompareToZeroChecker(linter))

${this.title}

Code Editor : comparetozero.py