使用csv模块。写出一行时，用于row[:-1]截去最后一项：
import csv
with open(filename,"r") as fin:
with open(outname,"w") as fout:
writer=csv.writer(fout)
for row in csv.reader(fin):
writer.writerow(row[:-1])
使用Python删除或删除CSV文件中的最后一列
使用Python删除或删除CSV文件中的最后一列
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