使用df_s[‘Coname’].str.contains(‘ST’)，然后再取反
df_s = df_s[(df_s["Dlstdt"]>="2022-01-01")]
df_s = df_s[~df_s['Coname'].str.contains('ST')]
df_s = df_s[df_s["Stktyp"]=="A股"]
使用df_s[‘Coname’].str.contains(‘ST’)，然后再取反
df_s = df_s[(df_s["Dlstdt"]>="2022-01-01")]
df_s = df_s[~df_s['Coname'].str.contains('ST')]
df_s = df_s[df_s["Stktyp"]=="A股"]
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