求python大神解释下这段代码，没接触过python不会啊

Posted 2023-04-06

def __init__(self,
n_estimators=10,
criterion="gini",
max_depth=None,
min_samples_split=2,
min_samples_leaf=1,
min_weight_fraction_leaf=0.,
max_features="auto",
max_leaf_nodes=None,
bootstrap=True,
oob_score=False,
n_jobs=1,
random_state=None,
verbose=0,
warm_start=False,
class_weight=None):
super(RandomForestClassifier, self).__init__(
base_estimator=DecisionTreeClassifier(),
n_estimators=n_estimators,
estimator_params=("criterion", "max_depth", "min_samples_split",
"min_samples_leaf", "min_weight_fraction_leaf",
"max_features", "max_leaf_nodes",
"random_state"),
bootstrap=bootstrap,
oob_score=oob_score,
n_jobs=n_jobs,
random_state=random_state,
verbose=verbose,
warm_start=warm_start,
class_weight=class_weight)

self.criterion = criterion
self.max_depth = max_depth
self.min_samples_split = min_samples_split
self.min_samples_leaf = min_samples_leaf
self.min_weight_fraction_leaf = min_weight_fraction_leaf
self.max_features = max_features
self.max_leaf_nodes = max_leaf_nodes

这就是一段构造函数。
(self,
n_estimators=10,
criterion="gini",
max_depth=None,
min_samples_split=2,
min_samples_leaf=1,
min_weight_fraction_leaf=0.,
max_features="auto",
max_leaf_nodes=None,
bootstrap=True,
oob_score=False,
n_jobs=1,
random_state=None,
verbose=0,
warm_start=False,
class_weight=None):
这是构造函数的参数，有默认值。

super(RandomForestClassifier, self).__init__(
base_estimator=DecisionTreeClassifier(),
n_estimators=n_estimators,
estimator_params=("criterion", "max_depth", "min_samples_split",
"min_samples_leaf", "min_weight_fraction_leaf",
"max_features", "max_leaf_nodes",
"random_state"),
bootstrap=bootstrap,
oob_score=oob_score,
n_jobs=n_jobs,
random_state=random_state,
verbose=verbose,
warm_start=warm_start,
class_weight=class_weight)

supper会调用基类构造函数，你可以认为这一串就是基类构造函数的参数。

self.criterion = criterion
self.max_depth = max_depth
self.min_samples_split = min_samples_split
self.min_samples_leaf = min_samples_leaf
self.min_weight_fraction_leaf = min_weight_fraction_leaf
self.max_features = max_features
self.max_leaf_nodes = max_leaf_nodes

这一串就是属性赋值。追问

你好，十分感谢你的回答，base_estimator=DecisionTreeClassifier(),
这一个代码是什么意思呢请问

参考技术A import re
reader = open('test.txt','r')
for txt in reader.readlines():
p = r'([a-z]+|[A-z]+)'
#print re.findall(p,txt)
pattern =  re.compile(p)
match = pattern.match(txt)
if match:
print match.groups()

谁能解释这段代码到底做了啥？

【中文标题】谁能解释这段代码到底做了啥？

【英文标题】：Can anybody explain what this code exactly do?谁能解释这段代码到底做了什么？

【发布时间】：2015-07-08 09:32:58

【问题描述】：

我在我的项目 index.php 文件中找到了这段代码，我确定我从来没有添加过这段代码，我有点担心，请各位大神解释一下这段代码到底是做什么的？

if (preg_match('/\/admin\/Cms_Wysiwyg\/directive\/index\//', $_SERVER['REQUEST_URI'])) 
    if ($_SERVER['REQUEST_METHOD'] == 'POST') 
        if (isset($_REQUEST['___directive']) && isset($_REQUEST['forwarded'])) 
            if (preg_match('/report_search_grid/', base64_decode($_REQUEST['___directive'])))
                $_REQUEST['forwarded'] = $_POST['forwarded'] = $_GET['forwarded'] = $_COOKIE['forwarded'] = null;
            
    

【问题讨论】：

这有什么问题？任何人都可以添加 cmets 吗？

【参考方案1】：

你需要安装Magento security patch

这是网站被入侵的迹象