一. csv文件

二. 读取csv文件的两种方式

import csvdef read_csv_demo1():with open('classroom1.csv','r',encoding='utf-8',newline='') as fp:# reader是一个迭代器reader = csv.reader(fp)next(reader)for x in reader:username = x[0]height = x[2]print({'username':username,'height':height})def write_csv_demo2():with open('classroom2.csv','r',encoding='utf-8',newline='') as fp:#使用DictReader创建的reader对象，不会包含标题那行的数据#reader是一个迭代器，遍历这个迭代器，返回来一个字典reader = csv.DictReader(fp)for x in reader:value = {'username':x['username'],'height':x['height']}print(value)if __name__ == '__main__':# read_csv_demo1()write_csv_demo2()

三. 写入csv文件的两种方式

import csvdef write_csv_demo1():headers = ['username','age','height']values = [('张三', 18, 180),('李四', 19, 190),('王五', 20, 170)]with open('classroom1.csv','w',encoding='utf-8',newline='') as fp:write = csv.writer(fp)write.writerow(headers)write.writerows(values)def write_csv_demo2():headers = ['username','age','height']values = [{'username':'张三', 'age': 18, 'height': 180},{'username':'李四', 'age': 19, 'height': 190},{'username':'王五', 'age': 20, 'height': 170}]with open('classroom2.csv','w',encoding='utf-8',newline='') as fp:writer = csv.DictWriter(fp,headers)#写入表头数据的时候，需要调用writeheader方法writer.writeheader()writer.writerows(values)if __name__ == '__main__':# write_csv_demo1()write_csv_demo2()