Write a Python program that attempts to open a non-existent file in read mode and catches the FileNotFoundError to display a user-friendly message. Write a Python program to implement a function that checks if a file exists before opening it, raising and handling FileNotFoundError if not f...
File "C:\___Soft___\python3.6\lib\subprocess.py", line 997, in _execute_c hild startupinfo) FileNotFoundError: [WinError 2] 系统找不到指定的文件。 During handling of the above exception, another exception occurred: Traceback (most recent call last): File "alimama.py", line 76, in...
Handling run-timeerror:intdivisionormodulo by zero try-finally 语句 try-finally 语句无论是否发生异常都将执行最后的代码。 以下实例中 finally 语句无论异常是否发生都会执行: 实例 try: runoob() exceptAssertionErroraserror: print(error) else: try: withopen('file.log')asfile: read_data=file.read()...
Handling run-time error: int division or modulo by zero try-finally 语句 try-finally 语句无论是否发生异常都将执行最后的代码。 以下实例中 finally 语句无论异常是否发生都会执行: 实例 try: runoob() except AssertionError as error: print(error) else: try: with open('file.log') as file: read_...
During handling of the above exception, another exception occurred: Traceback (most recent call last): File "<stdin>", line 6, in <module> NameError: name 'a' is not defined >>> 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. ...
except (RuntimeError, TypeError, NameError): pass 1. 2. except子句可以忽略异常的名称,它将被当作通配符使用。你可以使用这种方法打印一个错误信息,然后再次把异常抛出。 示例: import sys try: f = open('myfile.txt') s = f.readline()
>>>defthis_fails():x=1/0>>>try:this_fails()except ZeroDivisionErroraserr:print('Handling run-time error:',err)Handling run-time error:int division or modulo by zero try-finally 语句 try-finally 语句无论是否发生异常都将执行最后的代码。
file = open('example.txt', 'r') except FileNotFoundError: print("File not found!") Different Modes for a File Handling in Python In Python, there are several modes for file handling (file open modes) including: Read mode ('r'): This mode is used to read an existing file. ...
File "d:\python3.5.2\install\lib\site-packages\pip\utils\__init__.py", line 482, in unzip_file zipfp = open(filename, 'rb') FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\noc\\tensorflow-1.0.0rc2-cp35-cp35m-win_amd64.whl' ...
在这个例子中可以看到,当我们使用 import 导入一个不存在的模块时,就会出现 ModuleNotFoundError 的错误,Traceback 最下面一句信息给出了原因,没有名为 aaa 的模块.然后我们再运行一个例子 from collections import asdf 运行之后的内容 Traceback (most recent call last ): File "/Users/chenxiangan/pythonproject...