How does pandas clean data elements whose values are strings in a column?

clipboard.png the value in the figure is "pass"

After

pandas reads the csv file, I want to delete the data line whose value is a string in the "kscj" column. What should I do?

Mar.05,2021

df["kscj"] = df["kscj"].astype(str)
result = df[df.kscj.str.isdigit()]
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bec503-31330.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bec503-31330.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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