17.Python

输出错误：try:, except ... as ...: 看如下代码

try:

    file=open('eeee.txt','r')  #会报错的代码

except Exception as e:  # 将报错存储在 e 中

    print(e)

"""

[Errno 2] No such file or directory: 'eeee.txt'

"""

处理错误：会使用到循环语句。首先报错：没有这样的文件No such file or directory.然后决定是否输入y,输入y以后，系统就会新建一个文件（要用写入的类型），再次运行后，文件中就会写入ssss

try:

    file=open('eeee.txt','r+')

except Exception as e:

    print(e)

    response = input('do you want to create a new file:')

    if response=='y':

        file=open('eeee.txt','w')

    else:

        pass

else:

    file.write('ssss')

    file.close()

"""

[Errno 2] No such file or directory: 'eeee.txt'

do you want to create a new file:y

ssss  #eeee.txt中会写入'ssss'