for-loop

问题 I have this list [<th align="left"> <a href="blablabla">F</a>ojweousa</th>, <th align="left"> <a href="blablabla">S</a>awdefrgt</th>, ...] and want the one single character after "> the multiple characters between </a> and </th>, to be concatenated so that i can move on with my life. Here is my code item2 = [] for element in items2: first_letter = re.search('">.</a', str(items2)) second_letter = re.search(r'</a>[a-zA-Z0-9]</th>,', str(items2)) item2.append([str(first_letter) + str(second

问题 I am trying to create multiple new variables inside a loop. The number of new variables depends on the lenght of another variable (variable "list" used below). for(var i = 0; i < list.lenght; i++) { var counter + i; // create new variable (i.e. counter1, counter2,...) } I found a lot of very simmilar questions on StackOverflow, and the answer is mostly using an array (i.e. How do I create dynamic variable names inside a loop?). If I use the suggested solution, do I create an array of

问题 I am trying to create multiple new variables inside a loop. The number of new variables depends on the lenght of another variable (variable "list" used below). for(var i = 0; i < list.lenght; i++) { var counter + i; // create new variable (i.e. counter1, counter2,...) } I found a lot of very simmilar questions on StackOverflow, and the answer is mostly using an array (i.e. How do I create dynamic variable names inside a loop?). If I use the suggested solution, do I create an array of

问题 I am trying to create multiple new variables inside a loop. The number of new variables depends on the lenght of another variable (variable "list" used below). for(var i = 0; i < list.lenght; i++) { var counter + i; // create new variable (i.e. counter1, counter2,...) } I found a lot of very simmilar questions on StackOverflow, and the answer is mostly using an array (i.e. How do I create dynamic variable names inside a loop?). If I use the suggested solution, do I create an array of

问题 I am trying to create multiple new variables inside a loop. The number of new variables depends on the lenght of another variable (variable "list" used below). for(var i = 0; i < list.lenght; i++) { var counter + i; // create new variable (i.e. counter1, counter2,...) } I found a lot of very simmilar questions on StackOverflow, and the answer is mostly using an array (i.e. How do I create dynamic variable names inside a loop?). If I use the suggested solution, do I create an array of

问题 I've got a highly complex class : class C: pass And I've got this test code : for j in range(10): c = C() print c Which gives : <__main__.C instance at 0x7f7336a6cb00> <__main__.C instance at 0x7f7336a6cab8> <__main__.C instance at 0x7f7336a6cb00> <__main__.C instance at 0x7f7336a6cab8> <__main__.C instance at 0x7f7336a6cb00> <__main__.C instance at 0x7f7336a6cab8> <__main__.C instance at 0x7f7336a6cb00> <__main__.C instance at 0x7f7336a6cab8> <__main__.C instance at 0x7f7336a6cb00> <__main__

问题 I have 3 linear regression models built using the mtcars and would like to use those models to generate predictions for each rows of the mtcars tables. Those predictions should be added as additional columns (3 additional columns) of the mtcars dataframe and should be generated in a for loop using the leave one out approach. Furthermore predictions for model1 and model2 should be performed by "grouping" the cyl numbers whiles predictions made with the model 3 should be accomplished without

问题 I have 3 linear regression models built using the mtcars and would like to use those models to generate predictions for each rows of the mtcars tables. Those predictions should be added as additional columns (3 additional columns) of the mtcars dataframe and should be generated in a for loop using the leave one out approach. Furthermore predictions for model1 and model2 should be performed by "grouping" the cyl numbers whiles predictions made with the model 3 should be accomplished without

问题 I have 3 linear regression models built using the mtcars and would like to use those models to generate predictions for each rows of the mtcars tables. Those predictions should be added as additional columns (3 additional columns) of the mtcars dataframe and should be generated in a for loop using the leave one out approach. Furthermore predictions for model1 and model2 should be performed by "grouping" the cyl numbers whiles predictions made with the model 3 should be accomplished without

问题 I have got a problem in assigning new value by list. I want to change 12 items values in s numpy by numpy array's index ,and i hope every index i choose is different. so i made a list random.sample(range(0,len(s),12) to select 12 different index.And through this index change some of values in numpy array s() However, I'm getting the error: SyntaxError: can't assign to function call import numpy as np import random N = 20 s = np.zeros([N]) alist = random.sample(range(0,20),12) alist for i in