conditional-statements

问题 I have a dataframe below. a = {'Id': ['ants', 'bees', 'cows', 'snakes', 'horses'], '2nd Attempts': [10, 12, 15, 14, 0], '3rd Attempts': [10, 10, 9, 11, 10]} a = pd.DataFrame(a) print (a) I want to able add text ('-s') to anything which is equal to 4 characters. i have unsuccessfully tried the below. as it produces the error, ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all(). if a['Id'].str.len() == 3: a['Id'] = a['Id'].str.replace('s', '

问题 I am unsure about the guarantees of execution for the C / C++ ternary operator. For instance if I am given an address and a boolean that tells if that address is good for reading I can easily avoid bad reads using if/else: int foo(const bool addressGood, const int* ptr) { if (addressGood) { return ptr[0]; } else { return 0; } } However can a ternary operator ( ?: ) guarantee that ptr won't be accessed unless addressGood is true? Or could an optimizing compiler generate code that accesses ptr

问题 for the last 4 hours ive been trying to understand how to do it. to be clear, i need to add a fragment under a certain condition and for my purpose the condition can be either: a. if the parent's id matches to what i seek. b. if the fragment's id matches to what i seek. i tried to put the condition inside the fragment itself: public class BlockFrag extends Fragment{ SharedPreferences sp; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState

问题 Currently I am trying to check if the user has the access to certain page (based on their membership plan). Below is my code, but it seems like wc_memberships_is_user_active_member only check if the user is an active member. if( wc_memberships_is_post_content_restricted() && is_page($postid) && wc_memberships_is_user_active_member( $membership_plan ) ) { //do something } else { //do something } Thanks in advance. 回答1: I managed to do it with the code below, it check whether if the user (with

问题 I'm trying to group several consecutives rows (and assigning them the same value) while leaving some of the rows empty (when a certain condition is not fulfilled). My data are locations (xy coordinates), the date/time at which they were measured, and the time span between measures. Somehow simplified, they look like this: ID X Y Time Span 1 3445 7671 0:00 - 2 3312 7677 4:00 4 3 3309 7680 12:00 8 4 3299 7681 16:00 4 5 3243 7655 20:00 4 6 3222 7612 4:00 8 7 3260 7633 0:00 4 8 3254 7641 8:00 8 9

问题 I have a simple application with a "manager" thread that spawns ten simple "worker" threads. I want all of the "worker" threads to block on the same condition variable (ie: condvar), and I want to manually signal all ten threads to wake up at the same time with a pthread_cond_broadcast call. In the case of my application, it is possible for threads to suffer an error condition and terminate early, so it is possible that not all ten threads make it to the synchronization point. One simple

问题 In the Working with the Attribute Node chapter in Learning Javascript - A Hands-On Guide to the Fundamentals of Modern Javascript, the author Tim Wright said on Page 73: Removing an attribute is as simple as getting one. We just target the element node and use the method removeAttribute() to get it out of there. There are no Javascript exceptions thrown if you try to remove an attribute that doesn't exist , but it's still best practive to use the same hasAttribute() method we mentioned

问题 Previously I was relying on recursive, but I didn't get solution for some, then I found that Containable works fine for these. I am developing a movie review website. In that I need to show the list of movies which is related to a particular Genre. I have this below code: //example $genre = "drama"; $options = array( 'contain' => array( 'Movie', 'MoveiGenre.Genre' => array( 'conditions' => array('MovieGenre.Genre.name = "'.$genre.'"') ), 'MovieGenre.Genre.name' ), 'recursive' => 2, 'limit' =>

问题 In my java application I have a huge set of conditions which decides just one action. My question is how to make it look nice (I use NetBeans so I'd prefer solution that will not be broken by its code formatting function). I'd also like to have there as low amount of if/else statements as possible, because I think it will make it faster. My original code was a mess, so I made an action diagram: . Take a copy if you want to play with it. Please keep in mind that the diagram is not perfect as

问题 This question already has answers here : Pythonic way to check if a list is sorted or not (21 answers) Closed last year . I have a function named checker(nums) that has an argument that will later receive a list. What i want to do with that list is to check if each other element is greater or equal to the previous one. Example: I have a list [1, 1, 2, 2, 3] and i have to check if it fulfills the condition. Since it does, the function should return True My code: def checker(nums): for x in