python读取文件，如果未找到，可以抛错处理

def main():
    f =open('致橡树.txt','r',encoding='utf-8')
    print(f.read())
    f.close()
def test():
    f= None
    try:
        f = open("致橡树.svb",'r',encoding='utf-8')
        print(f.read())
    except FileNotFoundError:
        print("无法打开指定文件!")
    except LookupError:
        print('指定了未知的编码!')
    except UnicodeDecodeError:
        print('读取文件时解析错误!')
    finally:
       if f:
           f.close()

if __name__ =="__main__":
   main()
   test()

 

def main():
    f =open('致橡树.txt','r',encoding='utf-8')
    print(f.read())
    f.close()
def test():
    f= None
    try:
        f = open("致橡树.svb",'r',encoding='utf-8')
        print(f.read())
    except FileNotFoundError:
        print("无法打开指定文件!")
    except LookupError:
        print('指定了未知的编码!')
    except UnicodeDecodeError:
        print('读取文件时解析错误!')
    finally:
       if f:
           f.close()
def files():
    filenames =('a.txt','b.txt','c.txt')
    fs_list =[]
    try:
        for filename in filenames:
            fs_list.append(open(filename,'w',encoding='utf-8'))
        for number in range(1,10000):
            if number < 100:
                fs_list[0].write(str(number) + '\n')
            elif number < 1000:
                fs_list[1].write(str(number) + '\n')
            elif number < 10000:
                fs_list[2].write(str(number) + '\n')
    except IOError as ex:
        print(ex)
        print('写入文件时发生错误!')
    finally:
        for fs in fs_list:
            fs.close()
    print('操作成功')
if __name__ =="__main__":
   main()
   test()
   files()