any

问题 My intention is to create a struct that holds a reference to another one of a similar type, but with different generics to be used as a chain of linked objects. The problem is that writing this using the _ placeholder is not allowed: the type placeholder `_` is not allowed within types on item signatures E0121 I cannot simply give my struct another type parameter since the referenced object may reference another object too, and so on. This would lead to a very large number of type parameters,

问题 I am implementing simple library for lists in C, and I have a problem with writing find function. I would like my function to accept any type of argument to find, both: find(my_list, 3) and find(my_list, my_int_var_to_find) . I already have information what is type of list's elements . For now I've found couple of ways dealing with this: different function with suffix for different types: int findi(void* list, int i) , int findd(void* list, double d) - but I don't like this approach, it seems

问题 >>> l = list(range(10)) >>> l [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] >>> if filter(lambda x: x > 10, l): ... print "foo" ... else: # the list will be empty, so bar will be printed ... print "bar" ... bar I'd like to use any() for this instead, but any() only takes one argument: the iterable. Is there a better way? 回答1: Use a generator expression as that one argument: any(x > 10 for x in l) Here the predicate is in the expression side of the generator expression, but you can use any expression there,

问题 Is there any easy way to check if any elements in a jquery selector fulfill a condition? For instance, to check if any textboxes in a form are empty (kind of pseudo, not real jquery): $('input.tb').any(val().length == 0); Note: I know it could be done with a helper method, just curious if it was possible in one statement. 回答1: jQuery has a lot of pseudo selectors built in: http://api.jquery.com/category/selectors/jquery-selector-extensions/ You can also build your own with the filter()

问题 I've written bash script to open a file passed as argument and write it into another file. But my script will work properly only if the file is in the current directory. Now i need to open and write the file that is not in the current directory also. If compile is the name of my script, then ./compile next/123/file.txt should open the file.txt in the passed path. How can I do it? #!/bin/sh #FIRST SCRIPT clear echo "-----STARTING COMPILATION-----" #echo $1 name=$1 # Copy the filename to name

问题 I've added a KeyListener to a TextArea and wish to check if any key is pressed down. I have the following but it's too clumsy to check for all the letters and numbers: public void keyPressed(KeyEvent e) { if(e.getKeyCode() == KeyEvent.VK_A || e.getKeyCode() == KeyEvent.VK_B || e.getKeyCode() == KeyEvent.VK_C ||e.getKeyCode() == KeyEvent.VK_D etc...){ } } 回答1: You wouldn't need any if statements. The keyPressed method is fired whenever a key is pressed, so you're automatically thrown into the

问题 I dealing with DataFrames and Dictionaries now, and i have a problem, I have a Dictionary " Fruits " {BN:'Banana', LM:'Lemon', AP:'Apple' ..... etc} And a DataFrame- " Stock ": Fruit Price 0 Sweet Mango 1 1 Green Apple 2 2 Few blue Banana 0 3 Black Banana 5 I wand to do the next thing: replace all the values from Stock['Fruit'] with the Fruits.values() this way: if the value from Fruits appears in the Stock['Fruit'] row it will be replaced this way: Few blue Banana ---> Banana Black Banana --

问题 I have a dataframe that looks like: a A a B a C a D a E a F p A p B p C p D p E p F 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 2 0 1 0 0 0 0 0 0 1 0 0 0 3 0 0 1 0 0 1 0 0 0 0 0 0 4 0 0 0 1 0 1 0 0 0 0 0 0 5 0 0 0 0 1 0 0 0 0 0 0 0 6 0 0 0 0 0 0 1 0 0 0 0 0 df = pd.DataFrame({'p A':[0,0,0,0,0,0,1],'p B':[0,0,0,0,0,0,0],'p C':[0,0,1,0,0,0,0],'p D':[0,0,0,0,0,0,0],'p E':[0,0,0,0,0,0,0],'p F':[0,0,0,0,0,0,0],'a A':[0,1,0,0,0,0,0],'a B':[0,0,1,0,0,0,0],'a C':[0,0,0,1,0,0,0],'a D':[0,0,0,0

问题 I am trying to search in a 2D numpy array for a specific value, the get_above method returns a list of coordinates above the character 'initial char' def get_above(current, wordsearch): list_of_current_coords = get_coords_current(current, wordsearch) #print(list_of_current_coords) length = len(list_of_current_coords) first_coords = [] second_coords = [] for x in range(length): second = list_of_current_coords[x][1] new_first = list_of_current_coords[x][0] - 1 first_coords.append(new_first)

问题 I am doind a free Stanford online course (which is pretty cool, you should check that out) and I've been racking my brains for the lest 2 days and can't find an answer to the following problem. Please help. Question 4 Find names and grades of students who only have friends in the same grade. Return the result sorted by grade, then by name within each grade. When I finally thought that I had the answer my query returned all the values from the table Friend. This is the best I could come up