字符串，列表或数组？蟒蛇

Question

大家好，如果以下是字符串，列表或数组，请告诉我：

items =“a”，“b”，“c”，“d”，“e”，“f”，“g”

我很困惑，因为列表或数组通常会以某种括号开头？但是，我的包含多个对象，但我没有使用括号。

请帮忙。

谢谢！

Answer 1

它是一串字符串。

您可以找到的一种方法是使用type：

>>> items = "a","b","c","d","e","f","g"
>>> type(items)
<class 'tuple'>
>>> type(items[0])
<class 'str'>

Answer 2

这是元组

当元素被彗星分开时，它默认为元组。

您也可以将它们与各种变量对齐：

CREATE View vw_NonStandardDatabaseNames 
AS
    SELECT DISTINCT 
        X.DBRealName AS 'Non-Standard Name',*
    FROM 
        (SELECT 
             db.name AS [DBRealName],

             -- Client
             (CASE 
                 WHEN PATINDEX ('%[_]%', db.name) > 1 
                    THEN SUBSTRING(db.name,1,PATINDEX ('%[_]%', db.name)-1)
                    ELSE ''
              END) AS [Client],

             -- First Underscore
             PATINDEX ('%[_]%', db.name) AS [Pos_1], 
             (CASE 
                 WHEN PATINDEX ('%[_]%', db.name) > 0 
                    THEN '_'
                    ELSE ''
              END) AS [US_1],
             (CASE 
                 WHEN PATINDEX ('%[_]DEV%', db.name) > 0 
                    THEN '_'
                    ELSE ''
              END) AS [US_2], 

             -- Database Name
             (CASE 
                 WHEN PATINDEX ('%[_]%', db.name) <= 1 
                    THEN '' -- No Underscore 1
                 WHEN PATINDEX ('%[_]DEV%', db.name) <= 3  
                    THEN '' -- No Client
                 WHEN PATINDEX ('%[_]%', db.name) = PATINDEX  ('%[_]DEV%', db.name) 
                    THEN '' -- No first underscore only second one + System Name.
                 WHEN PATINDEX ('%[_]%', db.name)+1 = PATINDEX ('%[_]DEV%', db.name) 
                    THEN '' -- First underscore but no DB Name then second underscore + System Name.
                 WHEN PATINDEX ('%[_]%', db.name) > 1 
                      AND PATINDEX ('%[_]DEV%', db.name) > 3 
                    THEN SUBSTRING(db.name, PATINDEX ('%[_]%', db.name)+1,(PATINDEX('%[_]DEV%', db.name)-(PATINDEX ('%[_]%', db.name)+1)))
                    ELSE ''
              END) AS [DBName],

           -- Second Underscore
           PATINDEX ('%[_]DEV%', db.name) AS [Pos2], 

           -- System Name
           (CASE
              WHEN PATINDEX ('%[_]DEV%', db.name) > 0 THEN 'DEV'
              ELSE ''
            END)  AS [System_Name],

           -- System Name
           (CASE
              WHEN PATINDEX ('%[_]DEV-%', db.name) > 0 THEN PATINDEX ('%[_]DEV-%', db.name) + 4
              ELSE 0
            END)  AS [POS_3] 

            ---- Hyphen after 'DEV' System Name
         --  (CASE 
            --  WHEN db.name LIKE '%[_]DEV-%' THEN '-' 
            --  ELSE ''
            --END) AS [Hyphen]

           ---- Version Major
           --'' AS [VersionMajor],

           --'' AS [Dot1],

           ---- Version Minor
           --'' AS [VersionMinor],

           --'' AS [Dot2],

           ---- Revision 
           --'' AS [Revision],

           --'' AS [Dot3],

           ---- Build
           --'' AS [Build]

      FROM sys.databases db
      WHERE db.name NOT IN ('master','model','msdb','tempdb')
  --UNION 
        --as above but with 3 digit Version
      --UNION 
        --as above but with 4 digit version

 )  X
WHERE 
    X.DBRealName != Concat(X.Client, X.US_1, X.DBName, X.US_2, X.System_Name)    --, X.Hyphen, X.VersionMajor, X.Dot1, X.VersionMinor, X.Dot2, X.Revision, X.Dot3, X.Build