示例
import xlrd
from tqdm import tqdm
readbook= xlrd.open_workbook("./情感分析.xlsx")
reviews = open("3分类情感分析.txt","a",encoding="utf-8")
#通过表的索引号读取表格
sheet = readbook.sheet_by_index(0)
#行数
nrows = sheet.nrows
#列数
ncols = sheet.ncols
bar = tqdm(range(nrows),total=nrows)
for i in bar:
# print()
reviews.write(sheet.cell_value(i,0)+"\n")