syntax-error

问题 I just learned that the new walrus operator ( := ) can't be used to set instance attributes, it's supposedly invalid syntax (raises a SyntaxError ). Why is this? (And can you provide a link to official docs mentioning this?) I looked through PEP 572, and couldn't find if/where this is documented. Research This answer mentions this limitation without an explanation or source: you can't use the walrus operator on object attributes Sample Code class Foo: def __init__(self): self.foo: int = 0 def

问题 In this case I am getting an error. Anyone has any idea what's the problem in the code is? 回答1: param( $fileName = "d:\tmp\file.txt", $name = "Alan" ) @' Mohammed 3 4 5 4 Alan 2 1 3 2 Li 3 5 1 3 '@ | Out-File $fileName -Encoding default $hash = Get-Content $fileName | Where-Object {$_} | ForEach-Object { $array = $_ -split "\s+" @{ $array[0] = [Linq.Enumerable]::Average([int[]]($array[1..($array.Count-1)])) } } if ($hash.Keys -contains $name){ return "$name->$($hash.$name)" } else { return "

问题 In this case I am getting an error. Anyone has any idea what's the problem in the code is? 回答1: param( $fileName = "d:\tmp\file.txt", $name = "Alan" ) @' Mohammed 3 4 5 4 Alan 2 1 3 2 Li 3 5 1 3 '@ | Out-File $fileName -Encoding default $hash = Get-Content $fileName | Where-Object {$_} | ForEach-Object { $array = $_ -split "\s+" @{ $array[0] = [Linq.Enumerable]::Average([int[]]($array[1..($array.Count-1)])) } } if ($hash.Keys -contains $name){ return "$name->$($hash.$name)" } else { return "

问题 I'm getting error pls-00405 when I try to run this code: BEGIN IF :P10_KAART_CODE IN (SELECT KAART_CODE FROM CADEAUKAART) THEN RETURN TRUE; ELSE RETURN FALSE; END IF; END; There are some similar questions about this but couldn't find a solution for this simple code. Is there another way of writing this without facing a error? 回答1: You may try a cursor, alternatively : DECLARE v_flag boolean := FALSE; BEGIN FOR c IN ( SELECT KAART_CODE FROM CADEAUKAART ) LOOP IF :P10_KAART_CODE = c.KAART_CODE

问题 Closed. This question is not reproducible or was caused by typos. 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 . Improve this question #include <stdio.h> main() { float fahr, celsius; int lower, upper, step; lower = 0; upper = 300; step = 20; fahr = lower; while (fahr <= upper) { celsius =(5.0/9.0)*(fahr-32.0); printf( “%3.0f %6.1f\n”,fahr,celsius ); fahr = fahr + step; } } I am using a mac.

问题 Closed. This question is not reproducible or was caused by typos. 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 . Improve this question #include <stdio.h> main() { float fahr, celsius; int lower, upper, step; lower = 0; upper = 300; step = 20; fahr = lower; while (fahr <= upper) { celsius =(5.0/9.0)*(fahr-32.0); printf( “%3.0f %6.1f\n”,fahr,celsius ); fahr = fahr + step; } } I am using a mac.

问题 Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 19 days ago . Improve this question Can someone say why python doesn't allow this? # -*- coding: utf-8 -* import win32api,win32con,os,time,sys x_pad =464 y_pad =235 def tik(): win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,0,0) time.sleep(.1) win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP,0

问题 Well, I have run into a bit of a pickle here. I am needing to check some PHP for syntax errors. I noticed this bit that needs to run from the commandline: php -l somefile.php However, is there a way to run this from within a PHP file itself? I've been looking and have think that I can use parse_str function somehow to accomplish this by entering it into a $_GET, but can't quite understand how this works. Someone else told me to use token_get_all() php function to determine this. But I can't

问题 Well, I have run into a bit of a pickle here. I am needing to check some PHP for syntax errors. I noticed this bit that needs to run from the commandline: php -l somefile.php However, is there a way to run this from within a PHP file itself? I've been looking and have think that I can use parse_str function somehow to accomplish this by entering it into a $_GET, but can't quite understand how this works. Someone else told me to use token_get_all() php function to determine this. But I can't

问题 I am using Python 2.7.12 and I want to check whether the pip is installed or not. For this, in command line of Python application I wrote pip list and pressed enter. However, I get an error like: File"stdin",line 1 pip list Syntax Error: invalid syntax So, how can I solve this issue and get the list of modules as an output? Thanks 回答1: Use command line and not python. TLDR; On Windows, do: python -m pip --version Details: On Windows, ~> (open windows terminal) Start (or Windows Key) > type