python excel的操作（openpyxl库）

在python中新建、读取、写入excel表格有很多库，例如openpyxl、xlrd、xlwt等；

这里使用的是openpyxl，openpyxl库只能支持xlsx格式。

将excel保存在当前源文件目录下

def create_excel(filename):
    workbook = openpyxl.Workbook()
    sheet = workbook.active
    sheet.title = 'Sheet1'
    sheet.cell(1, 2, 'filename')
    sheet.cell(1, 3, 'height')
    sheet.cell(1, 4, 'width')
    workbook.save(filename)

1. 读取所有数据

def read_data():
    writeBook_in = openpyxl.load_workbook('result.xlsx')
    writeSheet_in = writeBook_in["Sheet1"]
    for row in writeSheet_in:
        for cell in row:
            print(cell.value, 't', end='')
        print('n')

2. 按需读取数据

def read_data():
    writeBook_in = openpyxl.load_workbook('result.xlsx')
    writeSheet_in = writeBook_in["Sheet1"]
    for row in range(1,3):
        c1 = writeSheet_in.cell(row, 1).value
        c1 = writeSheet_in.cell(row, 3).value

def write_data():
    writeBook_in = openpyxl.load_workbook('result.xlsx')
    writeSheet_in = writeBook_in["Sheet1"]
    for row in range(2, 4):
        writeSheet_in.cell(row, 1, 1)
        writeSheet_in.cell(row, 2, "img_1")
        writeSheet_in.cell(row, 3, "2")
        writeSheet_in.cell(row, 4, "3")
    writeBook_in.save('result.xlsx')

追加数据（不覆盖前面数据）

def write_data():
  	writeBook_in = openpyxl.load_workbook('result.xlsx')
    writeSheet_in = writeBook_in["Sheet1"]
    nrow = writeSheet_in.max_row 	# 读取当前表格的最大行
    nrow += 1
    writeSheet_in.cell(nrow, 1, 1)
    writeSheet_in.cell(nrow, 2, 2)
    writeSheet_in.cell(nrow, 3, 3)
    writeSheet_in.cell(nrow, 4, 4)
    writeBook_in.save('result.xlsx')