boolean

问题 I have a php script that changes a database when the page is requested. Here is the php: <?php date_default_timezone_set('EST');//set time zone $con=mysqli_connect("baukin.fatcowmysql.com","sas","***pass***","dbname");//establish connection // Check connection if (mysqli_connect_errno())//ping database to check connection { echo "Failed to connect to MySQL: " . mysqli_connect_error();//error message } else { echo "Successfully updated database";//success message } mysqli_query($con,"UPDATE

问题 I have a dataframe called 'running_tally' list jan_to jan_from 0 LA True False 1 NY False True I am trying to append new data to it in the form of a single column dataframe called 'new_data' list 0 HOU 1 LA I concat these two dfs based on their 'list' column for further processing, but immediately after I do that all the boolean values unexpectedly flip. running_tally = pd.concat([running_tally,new_data]).groupby('list',as_index=False).first() the above statement will produce: list jan_to jan

问题 public static void main(String[] args) { int [] newArray= new int [4]; int [] array = {4,5,6,7}; oddEven(array); newArray[0] = array[0]+array[1]+array[2]+array[3]; newArray[1] = array[0]*array[1]*array[2]*array[3]; } public static void oddEven(int [] oddEven) { for (int i=0; i<oddEven.length; i++) { // Cannot convert from int to boolean if (oddEven[i] % 2) } } Ignore what I'm trying to manage here. I'm only curious why it doesn't accept "if" statement in this for loop. As I stated it says

问题 I'm trying to write a little program where I ask the user to enter an email address. And then I verify if its a valid email address or not. Like "example@example.com" would be valid, but "example@@example.com.org" would be invalid. Here's my code, I have made it work to detect if there is an @ and . character in there, but I need to make sure it only appears once, and that the @ appears before the dot (.) import java.util.Scanner; public class email { public static void main(String args[]) {

问题 I have a vector of elements named markers of the form: markers <- LETTERS[1:5] Each element in markers is of Boolean type with two possible conditions + and - . I would like a fast an efficient way to obtain all possible combinations, so that the two conditions are considered (a marker with cannot be paired with itself even if the condition is different). The result would ideally be just a character vector or a list, where its elements are the marker combinations separated by / . The elements

问题 Trying to return value from function create or replace function compairenumber(num1 in number,num2 in number) return boolean is begin if num1 < num2 then return true; else return false; end if; end; when i'm giving query select compairenumber(5,10) from dual its not returning true or false. 回答1: Boolean values can only be used in other PL/SQL code, not in Oracle SQL. If you want a function whose return value is available in a select ... from dual then you will need to define the function to

问题 This example is just a basic program - I'm a new Coder - learning and experimenting whilst messing about .. Currently testing on Python 3.6 IDE and PyCharm - apologies for double spacing code - but looks a mess without. Looking for guidance for returning a value from a function. Have tried dozens of different methods / searched the forum, but closest answer this layman could understand stated I needed to use the return value otherwise it will be forgotten .. So added print(age_verification, "

问题 I am trying to use mypy to check a Python 3 project. In the example below, I want mypy to flag the construction of the class MyClass as an error, but it doesn't. class MyClass: def __init__(self, i:int) -> None: pass obj = MyClass(False) Can anyone explain this, please? I.e. explain why mypy does not report an error? 回答1: It’s because — unfortunately! — booleans in Python are integers. As in, bool is a subclass of int : In [1]: issubclass(bool, int) Out[1]: True Hence the code typechecks, and

问题 I am trying to use mypy to check a Python 3 project. In the example below, I want mypy to flag the construction of the class MyClass as an error, but it doesn't. class MyClass: def __init__(self, i:int) -> None: pass obj = MyClass(False) Can anyone explain this, please? I.e. explain why mypy does not report an error? 回答1: It’s because — unfortunately! — booleans in Python are integers. As in, bool is a subclass of int : In [1]: issubclass(bool, int) Out[1]: True Hence the code typechecks, and

问题 I have a column in my hive table which datatype is boolean. when I tried to import data from csv, it stored as NULL. This is my sample table : CREATE tABLE if not exists Engineanalysis( EngineModel String, EnginePartNo String , Location String, Position String, InspectionReq boolean) ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n'; My sample data : AB01,AS01-IT01,AIRFRAME,,0 AB02,AS01-IT02,AIRFRAME,,1 AB03,AS01-IT03,AIRFRAME,,1 AB04,AS01-IT04,AIRFRAME,,1 AB05,AS01-IT05