python excel写入 openpyxls

xlsx_file = "test.xlsx"
wb = openpyxl.Workbook(xlsx_file)
ws = wb.active
ws["A1"]="hello world"
ws["A2"]="this is test"

• 上种方法 写入文件，会覆盖打开前的内容

xlsx_file = "test.xlsx"
wb = openpyxl.load_workbook(xlsx_file)
ws = wb.active
ws["A1"]="hello world"
ws["A2"]="this is test"

• 这种方法是不会覆盖的