python使用openpyxl库修改excel表格数据方法

from openpyxl import load_workbook
from openpyxl import Workbook
from openpyxl.chart import BarChart, Series, Reference, BarChart3D
from openpyxl.styles import Color, Font, Alignment
from openpyxl.styles.colors import BLUE, RED, GREEN, YELLOW
class Write_excel(object):
  def __init__(self,filename):
    self.filename = filename
    self.wb = load_workbook(self.filename)
    self.ws = self.wb.active
  def write(self, coord, value):
    # eg: coord:A1
    self.ws.cell(coord).value = value
    self.wb.save(self.filename)
  def merge(self, rangstring):
    # eg: rangstring:A1:E1
    self.ws.merge_cells(rangstring)
    self.wb.save(self.filename)
  def cellstyle(self, coord, font, align):
    cell = self.ws.cell(coord)
    cell.font = font
    cell.alignment = align
  def makechart(self, title, pos, width, height, col1, row1, col2, row2, col3, row3, row4):
    ''':param title:图表名
         pos:图表位置
         width:图表宽度
         height:图表高度
    '''
    data = Reference(self.ws, min_col=col1, min_row=row1, max_col=col2, max_row=row2)
    cat = Reference(self.ws, min_col=col3, min_row=row3, max_row=row4)
    chart = BarChart3D()
    chart.title = title
    chart.width = width
    chart.height = height
    chart.add_data(data=data, titles_from_data=True)
    chart.set_categories(cat)
    self.ws.add_chart(chart, pos)
    self.wb.save(self.filename)

wb = Workbook()#创建工作簿 
ws = wb.active#激活工作表 
ws1 = wb.create_sheet("Mysheet")#创建mysheet表 
ws.title = "New Title"#表明改为New Title 
ws.sheet_properties.tabColor = "1072BA"#颜色 
ws['A4'] = 4#赋值 
d = ws.cell(row=4, column=2, value=10)#赋值 
cell_range = ws['A1':'C2']#选择单元格区域 
wb.save('test.xlsx')#保存 

wr = Write_excel('d:\demo.xlsx') 
wr.write('A2','hello') 

wr.merge('A1:B3') 

font = Font(name=u'宋体', size=14, color=RED, bold=True)
align = Alignment(horizontal='center', vertical='center')
wr.cellstyle('B2', font, align)

rows = [ 
  (None, 2013, 2014), 
  ("Apples", 5, 4), 
  ("Oranges", 6, 2), 
  ("Pears", 8, 3) 
] 
 
for row in rows: 
  ws.append(row) 
 
wr.makechart(u"3D Bar Chart", 'E5', 12.5, 7, 2, 1, 3, 4, 1, 2, 4)