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定义如下函数即可(以csv文件为例):
"""在csv文件中第一行添加索引字段"""
def write_raw_index(file):
filename = file
with open(filename, 'r+', encoding='utf-8') as f:
content = f.read()
f.seek(0, 0)
#mid, text, source, uid
text = 'mid' + ',' + 'text' + ',' + 'source' + ',' + 'uid'
f.write(text + '\n' + content)