仅当存在于 python 中时才返回该行

Question

我只想在特定行存在但无法实现的情况下返回值。在这里，我尝试了什么

def CurrentRunning(UserId):
    
        cursor = connection.cursor()
        cursor.execute('EXEC [dbo].[sp_GetCurrentRunningActivity]  @UserId=%s', (UserId,))
        result_set = cursor.fetchall()
        data= []    
        data.append({
                'TaskId':row[0],
                'Value1':row[1],
                'Value2' :row[2],
                'SelectedTeam':0 if row[3] is exists else row[3],
                'Level1':'0' if row[4] is exists else row[4],
                'Level2':'0' if row[5] is exists else row[5],
                'Level3':'0' if row[6] is exists else row[6],
                'Level4':'0' if row[7] is exists else row[7],
                'TotalVolume':'0' if row[8] is exists else row[8],
                'ReturnDate':'0' if row[9] is exists else row[9],
     
              })
                print('Activity')
                return Response(data)
     

Answer 1

您必须修改您的 if 语句：

def CurrentRunning(UserId):

    cursor = connection.cursor()
    cursor.execute('EXEC [dbo].[sp_GetCurrentRunningActivity]  @UserId=%s', (UserId,))
    result_set = cursor.fetchall()
    data= []    
    data.append({
            'TaskId':row[0],
            'Value1':row[1],
            'Value2' :row[2],
            'SelectedTeam': row[3] if row[3] is not None else '0',
            'Level1': row[4] if row[4] is not None else '0',
            'Level2': row[5] if row[5] is not None else '0',
            'Level3': row[6] if row[6] is not None else '0'
            ...
            ...

等等...

编码

val = row[3] if row[3] is not None else '0'

当 row[3] 为 None 时导致 val == '0'，否则 val 将等于 row[3]。

如果您不确定 row[3] 是否存在（可能是因为索引 3 大于 len(row)），您可以添加额外的检查：

val = row[3] if ((row is not None) and (len(row)>3) and (row[3] is not None)) else '0'