Python 3基础教程25-异常处理

在Python中，异常处理，主要是try except语句，通常语法格式如下.

try:

代码块1

except Exception as e:

print(e)

代码2

接着前面读取CSV文件，如果我们csv文件不存在，针对这个写一个异常处理。

 1 import csv
 2  
 3 try:
 4     with open(r'C:UsersAnthonyDesktopexample1.csv') as csvfile:
 5         readCSV = csv.reader(csvfile, delimiter=',')
 6         citys = []
 7         password = []
 8         days = []
 9         for row in readCSV:
10             city = row[0]
11             paword = row[1]
12             day = row[2]
13  
14         citys.append(city)
15         password.append(paword)
16         days.append(day)
17  
18         print(citys)
19         print(password)    
20         print(days)
21 except Exception as e:
22     print(e)
23     print('请确认该csv文件是否存在或路径是否写对！')

上面的exceple1.csv文件在桌面是不存在的，运行结果

[Errno 2] No such file or directory: 'C:\Users\Anthony\Desktop\example1.csv'
请确认该csv文件是否存在或路径是否写对！
>>>