What is the primary purpose of web scraping?

You fit a DBSCAN model and want to find the total number of data points that were flagged as noise/outliers. What code snippet correctly computes this?                       from sklearn.cluster import DBSCAN                    db = DBSCAN(eps=0.5, min_samples=5).fit(X)

You run a GridSearchCV with cv=5 (5-fold cross-validation) across a parameter grid that evaluates 4 different values of max_depth and 3 different values of min_samples_split for a Decision Tree. How many total times will the underlying Decision Tree model be trained/fitted during this process? 

What does a covariance matrix summarize in multivariate statistics? 

Which of the following is a one-dimensional labeled array data structure in Pandas?  

What type of indexing does the .loc accessor use?

What effect does slicing an array with np.newaxis (or None) have on its shape? 

What does the df.shape attribute return for a DataFrame?

What is the output of the following list comprehension expression?                    result = [x * 2 for x in range(1, 4)]                    print(result)

What will be the output of the following Python code?                    my_dict = {“x”: 10}                   print(my_dict.get(“y”, “Key Not Found”))                   print(my_dict.get(“x”, “Key Not Found”))