Pandas写入CSV格式

import pandas as pd
def putDataIntoCsv(dataContents, fileName):
    save = pd.DataFrame(dataContents, columns=titles)
    if (os.path.exists(fileName)):
        file = open(fileName, "a", encoding='utf-8')
        save.to_csv(file, header=False, line_terminator="\n", index=False)
        file.close()
        print("添加完成")
    else:
        file = open(fileName, "w", encoding='utf-8')
        save.to_csv(file, line_terminator="\n", index=False)
        file.close()
        print("新建完成")
    # 释放
    return []