reverse

问题 This question already has answers here : Appending turns my list to NoneType (3 answers) Removing item from list causes the list to become nonetype (2 answers) Closed last year . I noticed odd behaviour when returning a list (with a single element) from a function and then trying to reverse it, using reverse() I've distilled it here: def myFunction(): return ["The Smiths"] nums = [5,4,3,2,1] nums.reverse() print nums # 1,2,3,4,5 - fine! # lets use one element in a list something = ["Gwen

问题 My friend got an assignment and I can't help him. Basically, using recursion he needs to print the words of a sentence in the reverse order. For example: Input - This is a sentence Output - sentence a is This Here is an example I wrote him for a normal print, and I could do the whole sentence reversal with no problem, but I can't get neither an idea of a starting point for reversing only the words recursively without a linear approach and using the string library or linked lists or any other

问题 When working with creating games in Libgdx, I have not been using the physics engine as I dont have too many moving parts in the game. So, to have objects fall from the top of the screen to the bottom, I used what the documentation had, something like this: projectile.y -= 200 * Gdx.graphics.getDeltaTime(); That example will make said projectile go down at 200 pixels per second (I believe). What I am trying to do is make it so after two seconds, the projectile will transition from negative

问题 I'm trying to follow the documentation for lookups that span relationships for a "reverse" relationship, found here. Here is my model code: class Foo(models.Model): initiator = models.ForeignKey(User) date_time = models.DateTimeField() ... And here is my query code: ... now = datetime.now() users = User.objects.filter(foo__date_time__gte = now) ... This results in the following error: django.core.exceptions.FieldError: Cannot resolve keyword 'foo' into field. Choices are: _message_set, date

问题 I have three strings t1=3 , t2=1 and t3=5 . want to reverse these strings so that t1=5 , t2=1 and t3=3 . Together they form a number (input:315 and output:513). I need to reverse the number they form. I tried to do this: set "rest2=%t1%" set "t1=%t3%" set "t3=%rest2%" when I tried it, it removed t1 from the number they formed (input:315 and output: 13). I dont know why that happend. 回答1: I'm guessing your set commands all live within a parenthetical code block (such as a for loop), and you

问题 I have a question for you. So, I have to reverse a String with this requirement : Only use : 1 variable string (for input), 1 variable char & 1 variable int Can't use another string, string builder, list, array or collections Output result assigned in input variable Length of input variable can't be increase Can't use function substring And then I try this, is this correct? String str = "Hello World"; System.out.println("Before : "+str); for(int i=0;i<str.length();i++){ str = new String(str

问题 How does one go about using a alpha blending formula to achieve the src rgb color from the resultant of the 2 blended together 回答1: Well, you can just reorder the alpha blending equation Value = (1 − α ) · Value 0 + α · Value 1 However, there are four variables in that equation: α , Value , Value 0 and Value 1 . You need to know three of them to calculate the fourth. So in your case you know the resulting color, Value , the α and maybe Value 0 . You can then reorder the equation as follows: −

问题 The sort() and reverse() methods modify the list in place for economy of space when sorting or reversing a large list. To remind you that they operate by side effect, they don’t return the sorted or reversed list. The above text can be found at http://docs.python.org/2/library/stdtypes.html#mutable-sequence-types What does "modify the list in place for economy of space" mean? Example: x = ["happy", "sad"] y = x.reverse() would return None to y . So then why does, x.reverse() Successfully

问题 So if I input say 092, it does not return 290, instead returns 29 which is not what I want it to do. Any advice? int reverseNumber(int number){ int ans = 0; while(number > 0) { int rightDigit; rightDigit = number % 10; ans =ans *10 + rightDigit; number = number / 10; } return ans; } 回答1: It is because 029 is no different from 29 decimal 1 . For this to work you need to take the input as a string instead, and invert the characters. After that you can convert the resulting string to a number. 1

问题 I am trying to make a program where the user have to enter a string and get an reversed output. Moreover, it should change all lowercase letters to uppercase and uppercase to lowercase. I've already done program where you can enter 1 character. My next goal is to get as many characters as I want. I did some research and came up with this code: org 100h include emu8086.inc .DATA STR1 DB 0DH,0AH, 'Input: $' STR2 DB 0DH,0AH, 'Output: $' nl db 0dh,0ah,'$' .CODE START: MOV AX, @DATA MOV DS, AX cmp