Django+ openpyxl 导出文件，设置表头／内容格式

之前使用xlrd、xlrt处理文件的导入导出，这两个主要用于excel2003格式的文件的读写，并且xlrt最多可以写入256行，大于256行会报错

找了新插件openpyxl，对它找到针对某一行设置大小和对齐方式的方法，使用了下面的笨办法
官网：https://openpyxl.readthedocs.io/en/stable/styles.html#cell-styles-and-named-styles

from openpyxl import Workbook
from openpyxl.styles import  Alignment,Font,colors

def export(request,sql,sheet_name):
    wb = Workbook() #optimized_write=True
    # 创建一个sheet
    w = wb.create_sheet(sheet_name, 0)

    # 创建连接
    connection = pymysql.connect(**config)
    try:
        with connection.cursor() as cursor:
            # 执行sql语句，插入记录
            cursor.execute(sql);
            results = cursor.fetchall()
        # 没有设置默认自动提交，需要主动提交，以保存所执行的语句
        connection.commit()
    finally:
        connection.close();
    resultslist = list(results)

    i = 1
    for k, v in resultslist[0].items():
        w.cell(row=1, column=i).value = k.replace("t_", "").replace("F_", "")
        s = chr(i + 64) + str(1)
        w[s].alignment = Alignment(horizontal='center', vertical='center')
        w[s].font = Font(size=18, bold=True)
        w.column_dimensions[chr(i + 64)].width = 35
        i = i + 1
    excel_row = 2
    # 写入数据
    for i in range(0, len(resultslist)):
        excel_col = 1
        for k, v in resultslist[i].items():
            w.cell(row=excel_row, column=excel_col).value = v
            s=chr(excel_col+64)+str(excel_row)
            w[s].alignment= Alignment(horizontal='center', vertical='center')
            w[s].font = Font(size=16)
            excel_col = excel_col +1
        excel_row = excel_row + 1

    exist_file = os.path.exists("%s.xlsx" %sheet_name)
    if exist_file:
        os.remove("%s.xlsx" %sheet_name)

    response = HttpResponse(content_type='application/msexcel')
    response['Content-Disposition'] = 'attachment;filename=%s.xlsx' % sheet_name
    wb.save(response)
    return response