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。

 import csv

 try:
     with open(r'C:\Users\Anthony\Desktop\example1.csv') as csvfile:
         readCSV = csv.reader(csvfile, delimiter=',')
         citys = []
         password = []
         days = []
         for row in readCSV:
             city = row[0]
             paword = row[1]
             day = row[2]

         citys.append(city)
         password.append(paword)
         days.append(day)

         print(citys)
         print(password)
         print(days)
 except Exception as e:
     print(e)
     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！
>>>