conditional-statements

问题 In a poker where each player gets 5 cards from a 32 card deck, I am trying to calculate how many subsets contain exactly one pair using Mathematica. I created a deck with four suits and created subsets of all possible combinations of the cards and now I am trying to filter out all the wrong combinations using different methods to exclude the four of a kind and three of a kind and the full house. but the filter is still showing higher values than it actually is. The out put of my program is

问题 I've created a script in python to fetch the title of certain posts from different links of a webpage. The thing is the webpage I'm trying to play with sometimes doesn't provide me with valid response, but I do get a valid response when I try it twice or thrice. I've been trying to create a loop in such a way so that the script will check whether my defined title is nothing. If the title is nothing then the script will keep looping 4 times to see If it can succeed. However, after fourth try

问题 I have a dataframe Date , containing dates , times and values: Date Time Global_active_power 16/12/2006 17:24:00 4.216 16/12/2006 18:25:00 4.5 17/12/2006 17:25:00 4.52 18/12/2006 17:25:00 4.557 Now I want to find a row depending on the date - for example all rows with date > 16/12/2006. This is my code: Data$Date<- as.Date(Data$Date,"%dd%mm%yyyy" ) Data$Time<-strptime(Data$Time, "%h%m%s") print(class(Data$Date)) print(class(Data$Time)) Data1<-subset(Data, (Date=="16/12/2006" )) View(Data1)

问题 This is my example table: CREATE TABLE test( name VARCHAR(35), age INT(3)) And some values: insert into test values ('alex', 13); insert into test values ('dan', 17); insert into test (name) values ('pete'); insert into test (name) values ('david'); When I use SELECT query with the condition on column 'age': select * from test where age!=13; The result I got is: +------+------+ | name | age | +------+------+ | dan | 17 | +------+------+ But I want all the record with age!=13 which includes

问题 I have the table below.Using salary as condition I want to get multiple rows. Below is current table call it employee. empid name salary ----------------------------------- 1 A1 alex 20000 2 B2 ben 4500 3 C1 carl 14000 compare the salary to certain fixed values, and every time the salary is larger than the fixed value, show a record in output.My attempt condition case is close to this: incometype= case When salary<6000 then 101 When salary Between 6000 And 18000 Then 102 Else 103 End Desired

问题 I recently asked a question which was answered - How do I add conditionally to a selection of cells in a pandas dataframe column when the the column is a series of lists?, but I believe have a new problem which I had not previously considered. In the following dataframe I need two conditions to result in a change to column d . Each value in column d is a list . Where a == b , the final integer in d is incremented by one. Where a != b , the list of integers is extended and the value 1 is

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 4 years ago . I was testing all these different constructs using getrusage() to calculate the variations of (ru_utime + ru_stime) before and after executing them. It turns out there's no little difference in performing the same task for similar constructs. Here are the results: printf (1.5

问题 I created the simple code: name = raw_input("Hi. What's your name? \nType name: ") age = raw_input("How old are you " + name + "? \nType age: ") if age >= 21 print "Margaritas for everyone!!!" else: print "NO alcohol for you, young one!!!" raw_input("\nPress enter to exit.") It works great until I get to the 'if' statement... it tells me that I am using invalid syntax. I am trying to learn how to use Python, and have messed around with the code quite a bit, but I can't figure out what I did

问题 I have the following code to show a table of coming events in my page: {is_future} <tr> <td>#_EVENTLINK</td> <td>#d/#m/#Y</td> <td>#_EVENTNOOFDAYS</td> <td>#_EVENTTIMES</td> <td>{not_free}#_EVENTPRICEMAX{/not_free} {fully_booked}Geen plaatsen beschikbaar{/fully_booked}</td> </tr> {/is_future} This works fine for events that can still accept reservations. However when an event has been booked full, it shows "€0,00 Geen plaatsen beschikbaar" instead of "Geen plaatsen beschikbaar". It looks like

问题 I'm trying to parse a json file that I get from a certain REST API. The json has a few arrays, and I'd like to choose a specific item from an array based on the value of another item. for example: [ { "item1": true, "item2": "value" }, { "item1": false, "item2": "value" } ] I'd like to check if item1 is true, and only then, i want to get the value from item2. how would I handle it? I've tried to use a json parser named underscore which is great, but I cant get to the final result. thanks 回答1: