4_3 读取csv文件

"""读取csv文件"""


import csv

def readcsv_demo1():
    """采用列表形式，下标操作"""
    with open('csvwriter.csv', 'r') as fp:
        # reader是一个迭代器
        reader = csv.reader(fp)
        next(reader)    #向下走一行
        for x in reader:
            #print(x)
            name = x[1]
            value = x[-1]
            print({'name':name, 'value':value})
    fp.close()

def readcsv_demo2():
    """采用字典形式读取"""
    with open('csvwriter.csv', 'r', encoding='utf-8') as fp:
        # 不会包含标题的数据
        reader = csv.DictReader(fp)
        for x in reader:
            print(x)
            print(x['username'])  # 字典操作取某个值
    fp.close()

if __name__ == "__main__":
    readcsv_demo1()
    readcsv_demo2()