syntax-error

问题 I want to implement the following: throwingFunction()??.doStuff() /* if throwingFunction throws an error: print the error else returns an object with the doStuff() Method */ throwingFunction()?? /* if an error is thrown, prints the error. else execute the function without errors. */ I'm not sure where to look in the source code for examples on how do, try, catch were implemented. The Swift error docs explain how to use error handle methods that are already implemented. To be clear, I want to

问题 This question already has answers here : Syntax error on print with Python 3 [duplicate] (3 answers) Closed 4 years ago . I'm doing a simple game on Python that uses a random.random() feature, however I'm getting a Invalid Syntax on random.random() in the end of the script. I am not very talented and probably the solution is very simple, but I just don't get why is it sending me the error, I would very much appreciate your help. #Text based game import time import os import sys import random

问题 I am trying to create and set a variable: DECLARE myId INT; SET myId = 5; However, I am getting invalid syntax complaint in MySQL Workbench: SQL syntax error near 'DECLARE myId INT;' I have tried the following variants: DECLARE myId INT(4); SET myId = 5; DECLARE @myId INT; SET @myId = 5; DECLARE @myId INT(4); SET @myId = 5; What is wrong? 回答1: As in the comment says Declare is only valid into stored programs like procedures, functions. here you have an example of a store procedure and its

问题 I have downloaded and installed node.js from https://nodejs.org/en/. I want to run a js file: console.log('hello'); I run node app.js And get a syntax error: SyntaxError: Invalid or unexpected token [90m at Module._compile (internal/modules/cjs/loader.js:895:18)[39m [90m at Object.Module._extensions..js (internal/modules/cjs/loader.js:995:10)[39m [90m at Module.load (internal/modules/cjs/loader.js:815:32)[39m [90m at Function.Module._load (internal/modules/cjs/loader.js:727:14)[39m [90m at

问题 I have downloaded and installed node.js from https://nodejs.org/en/. I want to run a js file: console.log('hello'); I run node app.js And get a syntax error: SyntaxError: Invalid or unexpected token [90m at Module._compile (internal/modules/cjs/loader.js:895:18)[39m [90m at Object.Module._extensions..js (internal/modules/cjs/loader.js:995:10)[39m [90m at Module.load (internal/modules/cjs/loader.js:815:32)[39m [90m at Function.Module._load (internal/modules/cjs/loader.js:727:14)[39m [90m at

问题 I'm getting the message: >>> import some_module Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/david/.local/lib/python3.6/site-packages/some_module.py", line 1 ​def​ some_func(): ^ SyntaxError: invalid character in identifier When I am trying to import a local module from a package I installed with pip. The structure of the package is as follows: modules_and_packages ├── modules_and_packages │ ├── __init__.py │ └── some_module.py ├── setup.py └── bin └──

问题 var params = {a:1,b:2}; var str = '<a href="#" onclick="doSomething('+params+')">aaaa</a>'; document.write(str); when I click the <a> on the page,it throws "Uncaught SyntaxError: Unexpected identifier".I can't understand. 回答1: The reason is that when you use string concatenation, params is casted to string, as result you get something like [object Object] in parenthesis. You should better put params as var params = '{a:1,b:2}'; . Upd. As suggested in comments, another viable approach is using

问题 The database my application uses has field names containing spaces. I believe this to be the cause of my problem. Here is a typical query: SELECT * FROM 'OV2 BAS' AS bas INNER JOIN 'OV2 RefID' AS ids ON 'bas.Ref ID' = 'ids.Ref ID' WHERE ids.ENUM_H = 'TDischarge'; How do I deal with the spaces in the field names? Thanks. Additional Information This is to access a database made with MS Access 2007 (Microsoft.ACE.OLEDB.12.0). 回答1: I don't think you can use quotes around the actual table name;

问题 The database my application uses has field names containing spaces. I believe this to be the cause of my problem. Here is a typical query: SELECT * FROM 'OV2 BAS' AS bas INNER JOIN 'OV2 RefID' AS ids ON 'bas.Ref ID' = 'ids.Ref ID' WHERE ids.ENUM_H = 'TDischarge'; How do I deal with the spaces in the field names? Thanks. Additional Information This is to access a database made with MS Access 2007 (Microsoft.ACE.OLEDB.12.0). 回答1: I don't think you can use quotes around the actual table name;

问题 if session['dp'] := current_user.avatar : ^ SyntaxError: cannot use assignment expressions with subscript Why Python forbids this use of walrus operator? 回答1: Because, as the alternative name (named expressions) suggests, the left hand side of the walrus operator is to be a NAME. Therefore, by definition such expressions as noted in your question as well as, for instance, function calls are not allowed to be assigned in this form. The documentation also specifies: Single assignment targets