4_3 读取csv文件

 1 """读取csv文件"""
 2 
 3 
 4 import csv
 5 
 6 def readcsv_demo1():
 7     """采用列表形式，下标操作"""
 8     with open(‘csvwriter.csv‘, ‘r‘) as fp:
 9         # reader是一个迭代器
10         reader = csv.reader(fp)
11         next(reader)    #向下走一行
12         for x in reader:
13             #print(x)
14             name = x[1]
15             value = x[-1]
16             print({‘name‘:name, ‘value‘:value})
17     fp.close()
18 
19 def readcsv_demo2():
20     """采用字典形式读取"""
21     with open(‘csvwriter.csv‘, ‘r‘, encoding=‘utf-8‘) as fp:
22         # 不会包含标题的数据
23         reader = csv.DictReader(fp)
24         for x in reader:
25             print(x)
26             print(x[‘username‘])  # 字典操作取某个值
27     fp.close()
28 
29 if __name__ == "__main__":
30     readcsv_demo1()
31     readcsv_demo2()