str.split与vectoried一起使用
expand=True：
In [42]:df[['V','allele']] = df['V'].str.split('-',expand=True)dfOut[42]: ID Prob V allele0 3009 1.0000 IGHV7 B*011 129 1.0000 IGHV7 B*012 119 0.8000 IGHV6 A*013 120 0.8056 GHV6 A*014 121 0.9000 IGHV6 A*015 122 0.8050 IGHV6 A*016 130 1.0000 IGHV4 L*037 3014 1.0000 IGHV4 L*038 266 0.9970 IGHV5 A*019 849 0.4010 IGHV5 A*0410 174 1.0000 IGHV6 A*0211 844 1.0000 IGHV6 A*02
