创建csv文件，追加数据前先判断是否存在该csv文件
例子
import csvimport oscsv_header = ['time', 'temp', 'gas']file_name = 'model_data.csv'if not os.path.exists(file_name): #文件不存在with open(file_name, 'w', encoding='utf8', newline='') as file:writer = csv.writer(file)writer.writerow(csv_header)with open(file_name, 'a+', encoding='utf8', newline='') as file:writer = csv.writer(file)writer.writerow([1, 10, 20])writer.writerow([2, 11, 20])
追加数据，注意open()中要以'a+'模式打开。
不留数据空白行，指定参数newline=''
