圈复杂度和代码质量优化（附带示例代码纠正代码质量）

def add(a, b):
    return a + b

def factorial(n):
  if n == 0:
    return 1
  else:
    return n * factorial(n-1)

pip install mccabe

python -m mccabe --min 5 test.py

function test($number){	
  if($number < self::MIN_NUMBER)
  {
    $number = self::MIN_NUMBER;
  }
  for($i = 0; $i < $number; $i++){
    //some code	
  }
}

function test($number){	
  $number = getMin($number);
  for($i = 0; $i < $number; $i++){
    //some code	
  }
}
function getMin($number){
  if($number < self::MIN_NUMBER){
    return self::MIN_NUMBER;
  }
  return $number
}

if($str == 'China'){
  $result = '中国人';
}
else if($str == 'US'){
  $result = '美国人';
}
else if($str == 'France'){
  $result = '法国人';
}

$people = [
  'China' => '中国人',
  'US' => '美国人',
  'France' => '法国人'
];
$result = $people[$str];

if((条件1 && 条件2) || !条件1){
  return true;
}
else{
  return false;
}

if(条件1 && !条件2){
  return false;
}
return true;

if(do_some_1($number) || do_some_2($number)){
  $number = $number.$someStr1.$someStr2.'123456789';
}
else{
  $number = $number.$someStr3.$someStr4.'123456789';
}

if(do_some_fun($number)){
  $number = do_some_fun1($number);
}
else{
  $number = do_some_fun2($number);
}

if($x < 1) return 0;
if($y > 10) return 0;
if($z != 0) return 0;

if(get_result($x,$y,$z)) return 0;

$bool = false;
foreach($arrs as $arr){
    if(!$bool){
        if($arr == 1){
            someFunction();
            $bool = true;
        }
        if($arr == 2){
            someFunction();
            $bool = true;
        }
    }
}

foreach($arrs as $arr){
    if($arr == 1 || $arr == 2){
        someFunction();
    }
    break;
}

switch ($cat){
    case ‘fish’:
        eatFish();
    case ‘moss’:
        eatMoss();
}
function eatFish() {
    echo "Whale eats fish";
}
function eatMoss() {
    echo "Whale eat moss";
}

interface Eat {
    function eatFish();  
    function eatMoss();
}

class Whale implements Eat {
    public function eatFish() {
        echo "Whale eats fish";
    }
    public function eatMoss() {
        echo "Whale eat moss";
    }
}

$result = min(lastUsage(), 100) * 0.03;
if(lastUsage() > 100){
    $result += (min(lastUsage(), 200) - 100) * 0.05;
}

$result = getMin(0,100) * 0.03;
$result += getMin(100,200) * 0.03;

function getMin($start, $end){
    if(lastUsage() > $start){
        return (min(lastUsage(),$end) - $start);
    }
    return 0;
}

if($name == 'width'){
    $width = $value;
｝
else if ($name == 'height'){
    $height = $value;
}

function setWidth($value){
    $width = $value;
}
function setHeight($value){
    $height = $value;
}