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Python 2021-09-21 03:34:02
expand pandas dataframe into separate rows
def explode(df, lst_cols, fill_value='', preserve_index=False): # make sure `lst_cols` is list-alike if (lst_cols is not None and len(lst_cols) > 0 and not isinstance(lst_cols, (list, tuple, np.ndarray, pd.Series))): lst... Add solution -
Javascript 2021-09-14 00:56:03
react natice mock redux
check the Defautl documetation test you will find better idea to test your store test('should handle a todo being added to an empty list', () => { const previousState = [] expect(reducer(previousState, todoAdded('Run the tests'))).toEqual([ {... Add solution -
Javascript 2021-09-08 13:10:03
javascript arrays
//Creating a list var fruits = ["Apple", "Banana", "Cherry"]; //Creating an empty list var books = []; //Getting element of list //Lists are ordered using indexes //The first element in an list has an index of 0, //the sec... Add solution -
Java 2021-09-04 00:51:02
leetcode 46 problem permutation in java
public ArrayList<ArrayList<Integer>> permute(int[] num) { ArrayList<ArrayList<Integer>> result = new ArrayList<ArrayList<Integer>>(); //start from an empty list result.add(new ArrayList<Integer>()); &nbs... Add solution -
Other 2021-09-03 20:49:01
Generate 10 verification codes of length 4 and print them, e.g.,
#random package to find random integer import random #This method returns a random value of given length #len - parameter determines the length of the random value def random_value(len): result = '' #len decrements with each iteration #Hence... Add solution -
C# 2021-08-27 14:52:01
c# linq select from object list
// this will return the first correct answer, // or throw an exception if there are no correct answers var correct = answers.First(a => a.Correct); // this will return the first correct answer, // or null if there are no correct answers var correct ... Add solution
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