append

问题 func main() { slice := make([]int, 10, 10) slice[0] = 0 slice[1] = 1 slice1 := slice slice1[0] = 10000 fmt.Println(slice) slice1 = append(slice1, 100) slice1[0] = 20000 fmt.Println(slice) } result: [10000 1 0 0 0 0 0 0 0 0] [10000 1 0 0 0 0 0 0 0 0] In my understanding, slice is a pointer, slice1 and slice point to the same array, and the first output also proves this. But why did slice 's value remain unchanged after the append operation changed slice1 ? 回答1: The append() didn't change

问题 So I'm trying to add to a string and it shows up as empty. var DNA = "TAG"; var mRNA = ""; m_RNA() function check(a, b, string) { if (string = a) { mRNA.concat(b); } } function m_RNA(){ //console.log(DNA) for (var i = 0; i < DNA.length; i++) { console.log("Checking: " + DNA[i]); check("T", "A", DNA[i]); check("A", "U", DNA[i]); check("C", "G", DNA[i]); check("G", "C", DNA[i]); console.log(mRNA); } } Its supposed to show AUC in the console but its just blank. This is through firefox by the way

问题 So I'm trying to add to a string and it shows up as empty. var DNA = "TAG"; var mRNA = ""; m_RNA() function check(a, b, string) { if (string = a) { mRNA.concat(b); } } function m_RNA(){ //console.log(DNA) for (var i = 0; i < DNA.length; i++) { console.log("Checking: " + DNA[i]); check("T", "A", DNA[i]); check("A", "U", DNA[i]); check("C", "G", DNA[i]); check("G", "C", DNA[i]); console.log(mRNA); } } Its supposed to show AUC in the console but its just blank. This is through firefox by the way

问题 Data: lis_t = [['q', 'w', 'e'],['r', 't', 'y']] Expected Outcome: lis_t = [['q', 'w', 'e', 'u'],['r', 't', 'y']] problem description: I am trying to append to the list above however not able to append the same as it somehow results in none. Please help me understand what am I doing wrong. Code written: lis_t = [['q', 'w', 'e'],['r', 't', 'y']] lis_t[0] = lis_t[0].append('u') print(lis_t[0]) print(lis_t) output: None [None, ['r', 't', 'y']] 回答1: lis_t[0].append('u') this returns None value and

问题 Could someone help with a logical scheme in for loop statement in Python? I try to be more clear: i want to build a for loop cycle where if a condition is TRUE i want to append the same value for the next cells until another condition become TRUE. For example: i have a dataframe called df with 3 columns. The first column is the closing price of a stock (close_price), the second column contains the fast exponential moving average (fast_ema) and the third column contains the slow exponential

问题 I have data that is created rows by rows, 6 columns, I don't know the final number of rows in advance. Currently i'm creating a 2D slice of 200x6 with all zeros and then i replace these zeros gradually with my data, row by row. The data comes from another dataframe df It works but i don't like to end up with the last rows of my slice full of zeros. I see 2 solutions: - I delete all the last rows with only zeros when I'm done - I create an empty slice and append my data progressively to it I

问题 When I run the below code I get a list of details in separate columns. $file = 'c:\output\testing.csv' Get-AdUser -filter "DisplayName -eq 'joe bloggs'" | Get-ADUser -Properties * | Select-Object givenName, surname, mail, @{ Label = "Country" Expression = { if ($_.Country) { $_.Country } else { "GB" } } ,samaccountname, department, description | Export-csv -path $file Output (1) is as follows: +-----------+---------+-----------------+---------+----------------+------------+-------------+ |

问题 Can someone give me a hand with this: I created a loop to append successive intervals of historical price data from Coinbase. My loop iterates successfully a few times then crashes. Error message (under data_temp code line): "ValueError: If using all scalar values, you must pass an index" days = 10 end = datetime.now().replace(microsecond=0) start = end - timedelta(days=days) data_price = pd.DataFrame() for i in range(1,50): print(start) print(end) data_temp = pd.DataFrame(public_client.get

问题 I have this function: Dim db As DAO.Database Dim strInsert As String Set db = CurrentDb strInsert = "INSERT INTO items_affected_Table(CR_Id, VerOld, Equipment_Serial, Document_No, Description, Version) SELECT Items_affected_Table.CR_Id, Items_affected_Table.Version, Items_affected_Table.Equipment_Serial, Items_affected_Table.Document_No, Items_affected_Table.Description, Items_affected_Table.VerNext FROM Items_affected_Table WHERE (((Items_affected_Table.CR_Id)=[Forms]![CR form-unapproved]!

问题 I have this function: Dim db As DAO.Database Dim strInsert As String Set db = CurrentDb strInsert = "INSERT INTO items_affected_Table(CR_Id, VerOld, Equipment_Serial, Document_No, Description, Version) SELECT Items_affected_Table.CR_Id, Items_affected_Table.Version, Items_affected_Table.Equipment_Serial, Items_affected_Table.Document_No, Items_affected_Table.Description, Items_affected_Table.VerNext FROM Items_affected_Table WHERE (((Items_affected_Table.CR_Id)=[Forms]![CR form-unapproved]!