file.write(str+'\n') print('古诗写入完毕!') time.sleep(1) file.close() # 开始就是这里忘了关闭文件流了 对python还是不熟悉 也没有对应的报错 不像Java def copy(copy_flag): #文件复制 f = open("file.txt","r",encoding='utf-8') c = open("copy.txt", "w", encoding='utf-8') ...
file.write(str+'\n') print('古诗写入完毕!') time.sleep(1) file.close() # 开始就是这里忘了关闭文件流了 对python还是不熟悉 也没有对应的报错 不像Java def copy(copy_flag): #文件复制 f = open("file.txt","r",encoding='utf-8') c = open("copy.txt", "w", encoding='utf-8') ...
openFile -->|发生I/O错误| catchIOError catchIOError -->|捕获| handleIOError --> closeFile closeFile --> end 上述的journey图形展示了文件打开异常的处理逻辑流程。首先,我们尝试打开一个文件。如果文件存在,我们继续执行后续的文件操作;如果文件不存在,我们捕获到FileNotFoundError异常,并进行相应的处理。...
traceback.print_exc() 需要注意一个比较逆天的点,如果你的try catch捕捉了所有类型的error,那么它其实还会捕捉你的ctrl + C,即keyboardinterupt,此时你这个程序就只能用kill来终止了。因此要么只捕捉特定类型的error,要么加一个处理键盘中断的语句。
一、 try catch 格式: try: print('pass') except 异常类型: print('something wrong') 1.先执行try和excepet之前的语句,如果没有异常执行完try语句就结束。 2.如果在执行try语句的过程中发生了异常,try语句中剩下的部分不会再执行。 会将异常的类型和except后的错误类型进行匹配,如果匹配类型匹配得上,...
('Initial state: {}'.format(ckp.state))# CatchSIGQUITsignal.signal(signal.SIGQUIT,ckp.eviction_handler)# Get a value from the state.i=ckp.state.get('i',0)try:whileTrue:i+=1ckp.state['i']=iprint('Updated in-memory state: {}'.format(ckp.state))time.sleep(1)except Keyboard...
deftest_func():try:m=1/0except NameError:print("Catch NameError in the sub-function")try:test_func()except ZeroDivisionError:print("Catch error in the main program") 子程序的try...except...结构无法处理相应的除以0的错误,所以错误被抛给上层的主程序。
f =open("demofile.txt") try: f.write("Lorum Ipsum") except: print("Something went wrong when writing to the file") finally: f.close() except: print("Something went wrong when opening the file") Try it Yourself » The program can continue, without leaving the file object open. ...
方法catch的定义如下 def catch(self): self.txt.yview_moveto(1) now = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S') day = datetime.datetime.now().strftime('%Y-%m-%d') if self.cbvar.get() == 1: catch_day = self.en0.get() if self.en.get(): code = self.en.get(...
>>> test() catch exception! Traceback (most recent call last): raise Exception("error!") Exception: error! 如果需要,可⽤用 sys.exc_info() 获取调⽤用堆栈上的最后异常信息. >>> def test(): ... try: ... raise KeyError("key error!") ... except: ... exc_type, exc_value, ...