variable-names

问题 I know this was asked a lot but I can not work with/understand the answers so far. I want to change the suffix of variables in a for loop. I tried all answers the stackoverflow search provides. But it is difficult to understand specific codes the questioner often presents. So for clarification I use an easy example. This is not meant as application-oriented. I just want to understand how I can change the suffix. var_1 = 10 var_2 = 100 var_3 = 1000 for i in range(1,4): test_i = var_i + 1 print

问题 Consider following program: #include <cstdio> int main() { int printf=9; std::printf("%d",printf); } Is it fine to use built in function name as an identifier in variable declaration? Is this well defined program? I mean is behaviour of above program well defined? I am curious to know whether the C++ standard allows to use standard function names as identifiers of variables 回答1: It's well-formed because neither std::printf nor ::printf (which may also have been declared by <cstdio> !) are

问题 Consider following program: #include <cstdio> int main() { int printf=9; std::printf("%d",printf); } Is it fine to use built in function name as an identifier in variable declaration? Is this well defined program? I mean is behaviour of above program well defined? I am curious to know whether the C++ standard allows to use standard function names as identifiers of variables 回答1: It's well-formed because neither std::printf nor ::printf (which may also have been declared by <cstdio> !) are

问题 I want to create a file with takes a given list of variables for example: a1 = 3 a2 = 3 a3 = 4 a4 = 6 a5 = 'test' a6 = 19 a7 = 19 The output should be look as follows: test.txt a1 = 3 a2 = 3 a3 = 4 a4 = 6 a5 = 'test' a6 = 19 a7 = 19 Content of txt file. It is needed for setting up a model. I tried this way: def namestr(obj, namespace): names = [name for name in namespace if namespace[name] is obj] name = [n for n in names if 'a' in n] return name[0] with open("setupfile.txt", "w") as

问题 I wrote some code recently where I unintentionally reused a variable name as a parameter of an action declared within a function that already has a variable of the same name. For example: var x = 1; Action<int> myAction = (x) => { Console.WriteLine(x); }; When I spotted the duplication, I was surprised to see that the code compiled and ran perfectly, which is not behavior I would expect based on what I know about scope in C#. Some quick Googling turned up SO questions that complain that

问题 I wrote some code recently where I unintentionally reused a variable name as a parameter of an action declared within a function that already has a variable of the same name. For example: var x = 1; Action<int> myAction = (x) => { Console.WriteLine(x); }; When I spotted the duplication, I was surprised to see that the code compiled and ran perfectly, which is not behavior I would expect based on what I know about scope in C#. Some quick Googling turned up SO questions that complain that

问题 I wrote some code recently where I unintentionally reused a variable name as a parameter of an action declared within a function that already has a variable of the same name. For example: var x = 1; Action<int> myAction = (x) => { Console.WriteLine(x); }; When I spotted the duplication, I was surprised to see that the code compiled and ran perfectly, which is not behavior I would expect based on what I know about scope in C#. Some quick Googling turned up SO questions that complain that

问题 I have a Kotlin class in my application with a lot of attributes, what I want to build is a method that stores the variable name in a dictionary. The dictionary looks like this: HashMap<String, Pair<Any, Any>>() The purpose of this is to store the changes made to a certain attribute, I store the name of the variable as the key and in the Pair I store the old value and the new value. To notify a change I use the Observer pattern. So whenever a setter is called from an attribute a change will

问题 I have a Kotlin class in my application with a lot of attributes, what I want to build is a method that stores the variable name in a dictionary. The dictionary looks like this: HashMap<String, Pair<Any, Any>>() The purpose of this is to store the changes made to a certain attribute, I store the name of the variable as the key and in the Pair I store the old value and the new value. To notify a change I use the Observer pattern. So whenever a setter is called from an attribute a change will

问题 I hope someone can help. I have a large dataset imported to SAS with thousands of variables. I want to create a new dataset by extracting variables that have a specific keyword in their name. For example, the following variables are in my dataset: AAYAN_KK_Equity_Ask AAYAN_KK_Equity_Bid AAYAN_KK_Equity_Close AAYAN_KK_Equity_Date AAYAN_KK_Equity_Volume AAYANRE_KK_Equity_Ask AAYANRE_KK_Equity_Bid AAYANRE_KK_Equity_Close AAYANRE_KK_Equity_Date I want to extract variables that end with _Ask and