File"<stdin>",line1,in? ZeroDivisionError: division by zero >>>4+ spam*3# spam 未定义,触发异常 Traceback(most recent call last): File"<stdin>",line1,in? NameError: name'spam'isnotdefined >>>'2'+2# int 不能与 str 相加,
data = file.read() # 文件会在 with 块结束后自动关闭 except FileNotFoundError: print("文件不存在") 1. 2. 3. 4. 5. 6. 6)示例 具体异常优先:优先捕获具体异常,最后捕获通用异常。 try: # 代码 except ValueError: # 处理 ValueError except Exception as e: # 处理其他异常 1. 2. 3. 4. 5...
Exceptions Exceptions occur whenexceptionalsituations occur in your program. For example, what if you are going to read a file and the file does not exist? Or what if you accidentally deleted it when the program was running? Such situations are handled usingexceptions....
(注:在 file.read()和file.readline()方法时,他们打EOF返回一个空字符串。) 异常FloatingPointError 当浮点操作失败时触发。这个异常总是定义的,但是只有当Python配置了该--with-fpectl选项,或者WANT_SIGFPE_HANDLER在pyconfig.h文件中定义了符号时,才能引发此异常 。 异常GeneratorExit 当发电机的close()方法被...
try:runoob()exceptAssertionErroraserror:print(error)else:try:withopen('ShowMeAI.log')asfile:read_data=file.read()exceptFileNotFoundErrorasfnf_error:print(fnf_error)finally:print('无论异常是否发生,都会执行本句话。') 5.抛出异常 Python 使用 raise 语句抛出一个指定的异常。
data=f.read()print(data) f.close()#必须要调用这个函数with open('file name', mode='r', encoding='utf-8') as f:#以文本记的方式打开,不需要显示的调用close()data =f.read()print(data) with open('file name', mode='r', encoding='utf-8') as f: ...
Python中(至少)有两种错误:语法错误和异常(syntax errors和exceptions) 语法错误 语法错误,也被称作解析错误, 使我们在学习Python过程中最常遇到的错误, 来看看下面两个错误示例: if True print('titan') # 错误信息: File "../5-读文件.py", line 19 ...
f = open("file-not-exists", "r") except IOError,e: print("open exception: %s: %s\n" %(e.errno, e.strerror)) 与Python异常相关的关键字: 关键字 关键字说明 raise 抛出/引发异常 try/except 捕获异常并处理 pass 忽略异常 as 定义异常实例(except IOError as e) ...
Thepathlib.is_file()method is used to check the availability of files only. It returns True if the given file path exists; otherwise, it will return False. We will use theis_file()method to handle the exceptions in our program.
importloggingdefprocess_file(file_path):try:# 尝试打开文件withopen(file_path,'r')asfile:# 尝试读取文件内容content=file.read()print(f"File content:{content}")exceptFileNotFoundError:logging.error(f"File not found:{file_path}")exceptPermissionError:logging.error(f"Permission error:{file_path}...