dict的get("key", 0)方法不要添加default=正确的使用 d = {'2023-01-20 00:00:00': 123} print(d.get('2023-01-2 00:00:00', 12)) 1. 2. 如果像下面这样使用,便会报错 d = {'2023-01-20 00:00:00': 123} print(d.get('2023-01-2 00:00:00', default=12)) 1. 2. 报错结果 ...
'Changed', 'New', 'Python', 4.5, 6]# 删除元素my_list.remove('Changed')# 删除第一个匹配的元素print(my_list)# 输出: [1, 'New', 'Python', 4.5, 6]# 查找元素index=my_list.index('Python')print(index)# 输出: 2# 统计元素出现次数count=my_list.count(4.5)print(count)# 输出: 1# ...
>>> np.max(a, axis=0) # max of each column array([2, 4, 6]) 1. 2. 3. 4. 5. 参考链接:https://stackoverflow.com/questions/33569668/numpy-max-vs-amax-vs-maximum 如果想要将数据映射到[-1,1],则将公式换成: \[{x}_{normalization}=\frac{x-x_{mean}}{Max-Min}\] 1. x_mean...
y = dataset['target']X = dataset.drop(['target'], axis = 1)from sklearn.model_selection import cross_val_scoreknn_scores = []for k in range(1,21):knn_classifier = KNeighborsClassifier(n_neighbors = k)score=cross_val_score(knn_classifier,X,y,cv=10)knn_scores.append(score.mean())...
a=list_all_files("C:/Users/LyShark/Desktop/a") print(a) python检测指定端口状态 import socket sk = socket.socket(socket.AF_INET,socket.SOCK_STREAM) sk.settimeout(1) for ip in range(0,254): try: sk.connect(("192.168.1."+str(ip),443)) print("192.168.1.%d server open \n"%ip)...
xgbod.get_params() 代码语言:javascript 代码运行次数:0 运行 代码语言:javascript 代码运行次数:0 运行 AI代码解释 上下滑动查看更多{'base_score':0.5,'booster':'gbtree','colsample_bylevel':1,'colsample_bytree':1,'estimator_list':[KNN(algorithm='auto',contamination=0.1,leaf_size=30,method='large...
Mean of 'n' Nearest Past Neighbors: 使用'k'个最近的过去邻居的均值来填充缺失值,并计算填充后数据与原始数据的均方误差(MSE)。 Seasonal Mean: 使用相应季节期间的均值,它计算了对应季节期间的均值,并使用该均值来填充缺失值。然后,计算填充后数据与原始数据的均方误差(MSE),并绘制填充后的数据与原始数据的比较...
列表list (https://jq.qq.com/?_wv=1027&k=fpqlgUog) 初始化列表 指定元素初始化列表 >>> num=['aa','bb','cc',1,2,3] >>> print num ['aa', 'bb', 'cc', 1, 2, 3] 从字符串初始化列表 >>> a='oiawoidhoawd97192048f' ...
from SimpleCV import Image, Color, Display# load an image from imgurimg = Image('http://i.imgur.com/lfAeZ4n.png')# use a keypoint detector to find areas of interestfeats = img.findKeypoints()# draw the list of keypointsfeats.draw(color=Colo...
Start learning Python now » Learning by Examples With our "Try it Yourself" editor, you can edit Python code and view the result. ExampleGet your own Python Server print("Hello, World!") Try it Yourself » Click on the "Try it Yourself" button to see how it works. ...