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:UsersAnthonyDesktopexample1.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！
>>>