Not able to select text when execute through driver script

S2F35_LinkEventReport_Job: 'S2F35' W
<L[2]
<U2[1] 1> /* DATAID */
<L[63]
<L[2]
<U4[1] 27000> /* JobManager/ProcessJob:1:NoState-QueuedPooled */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27010> /* JobManager/ProcessJob:2:QueuedPooled-SettingUp */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27020> /* JobManager/ProcessJob:3:SettingUp-WaitingForStart */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27030> /* JobManager/ProcessJob:4:SettingUp-Processing */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27040> /* JobManager/ProcessJob:5:WaitingForStart-Processing */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27050> /* JobManager/ProcessJob:6:Processing-ProcessComplete */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27060> /* JobManager/ProcessJob:7:PostActive-NoState */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27070> /* JobManager/ProcessJob:8:Executing-Pausing */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27080> /* JobManager/ProcessJob:9:Pausing-Paused */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27090> /* JobManager/ProcessJob:10:Pause-Processing */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27100> /* JobManager/ProcessJob:11:Executing-Stopping */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27110> /* JobManager/ProcessJob:12:Pause-Stopping */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27120> /* JobManager/ProcessJob:13:Executing-Aborting */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27130> /* JobManager/ProcessJob:14:Stopping-Aborting */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27140> /* JobManager/ProcessJob:15:Pause-Aborting */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27150> /* JobManager/ProcessJob:16:Aborting-Aborted */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27160> /* JobManager/ProcessJob:17:Stopping-Stopped */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
<L[2]
<U4[1] 27170> /* JobManager/ProcessJob:14:QueuedPooled-NoState */
<L[2]
<U4[1] 8010>
<U4[1] 400>
>
>
>
>

Not able to select and delete above line through python scripting.y

Using below command-

NameMapping.Sys.Eugenus_CTC_Utilities_SecsTestApp.HwndSource_MainWindow.MainWindow.textBoxMsgToSend.Keys("^a[Del]")