literals

问题 I'm writing code for a project to determine the validity of credit cards and i've hit a wall, it seems like all of the things i have tried so far are not working. This is giving me an error for the sumofodds function where j=int(card[i]) The error is "Invalid Literal for Int() with Base 10 Is there anyone that can give me some advce? def sumofdoubles(): card=input() x=len(card) summ=0 for i in range(x-2,-1,-2): j=int(card[i]) u=j+j if u>9: h=u/2 summ=summ+h return(summ) def sumofevens(): card

问题 Attempting to pass ids dynamically breaks function: <p id="email1" onclick="mailTo(this.id,'com','abc','info','My Website','I have a question for you: ')">Send us an email</p> <p id="email2" onclick="mailTo(this.id,'org','xyz','support','My Other Website','I want to report a problem with your website.')">Report Website Problems</p> Hard coding document.querySelector('#email') is successful, but need id to be dynamic. Console prints var correctly. Err: qS.addEventListener is not a function.

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I can't believe it's that difficult to treat a variable as a raw string ! I have searched and found questions alike, but no proper answer. I have a variable with domain name stored in. e.g. 'domain\user', I need to get the username only using re . The problem is Python gives me hex values for special character

问题 Anyone know if the MySQLdb will automatically escape string literals for SQL statements? For instance I am trying to execute the following: cursor.execute("""SELECT * FROM `accounts` WHERE `account_name` = 'Blah'""") Will this escape the account name automatically? Or will it only escape if I do the following?: x = 'Blah' cursor.execute("""SELECT * FROM `accounts` WHERE `account_name` = %s""", (x)) Or will it do it for both? Can anyone clarify this as I can't find any information on it. 回答1:

问题 I just started to read the ISO C 2011 standard , well the last public draft of it [1] , and realized that in the C Lexical Grammer [1][458ff.] all (literal) numerical constants are unsigned. Does that mean that the Compiler interpret a signed numerical constant (like -5.1E10 or -1) as a call of the corresponding unary-operator ? e.g -1 <=> -(1) , +512 <=> +(512) UPDATE: My fault, "all (literal) numerical constants are unsigned" I mean "all (literal) numerical constants are non-negative"

问题 This question already has answers here : Why are compound literals in C modifiable (2 answers) Why do I get a segmentation fault when writing to a string initialized with “char *s” but not “char s[]”? (17 answers) Closed last year . String literals are lvalues, which leaves the door open to modify string literals. From C in a Nutshell: In C source code, a literal is a token that denotes a fixed value , which may be an integer, a floating-point number, a character, or a string. A literal’s

问题 Consider the following: int ival = 1.01; int &rval = 1.01; // error: non-const reference to a const value. int &rval = ival; rval = 1.01; The first assignment of &rval to a literal value fails as expected. If I comment out that line the code compiles and runs. I understand why the initialization fails, but I'm confused why the assignment to rval works in the last line. I didn't think it was allowed to assign a reference to a literal value. EDIT: Thanks for the quick answers. I'm tempted to

问题 I used the following testcode import numpy as np import csv data = np.zeros((3,),dtype=("S24,int,float")) with open("testtest.csv", 'w', newline='') as f: writer = csv.writer(f,delimiter=',') for row in data: writer.writerow(row) And the data in the csv file has b'' tags (byte literal tags) for the string components of the record array. What is the proper way to handle writing to csv of these record arrays and the best way to avoid having byte literal tags in my csv file? 回答1: I think you are

问题 I want put a server-side control in a Literal. Is it possible? If yes, how? I know the description of the class says it all: Represents HTML elements, text, and any other strings in an ASP.NET page that do not require processing on the server 回答1: If you want to be wrapping server side code in other controls you probably want to be using Panel. As the comments have already stated, it is impossible to treat literal text as a server side Control. 回答2: Funny this comes up as I just looked

问题 Could someone explain to me what can happen if I'll forget suffix(postfix) for constants(literals) in ANSI C? For example I saw for bit shift operations such defines: #define AAR_INTENSET_NOTRESOLVED_Pos (2UL) /*!< Position of NOTRESOLVED field. */ #define AAR_INTENSET_NOTRESOLVED_Msk (0x1UL << AAR_INTENSET_NOTRESOLVED_Pos) /*!< Bit mask of NOTRESOLVED field. */ #define AAR_INTENSET_NOTRESOLVED_Disabled (0UL) /*!< Interrupt disabled. */ #define AAR_INTENSET_NOTRESOLVED_Enabled (1UL) /*!<