file = open("file.txt", "r") # do something with the file file.close() 复制代码 另外,还可以使用with语句来打开文件,这样可以在结束时自动关闭文件句柄,无需手动调用close()方法,示例如下: with open("file.txt", "r") as file: # do something with the file pass # file is automatically clo...
# The file will be automatically closed when the with block is exited 因此，当使用with语句打开文...
Write mode ('w'): This mode is used to write to a file. It will create a new file if the file does not exist, and overwrite the file if it does exist. Append mode ('a'): This mode is used to add new data to the end of an existing file (append to a file). If the file...
open the file if not already open, and show the line. Use this to viewsource lines referenced in an exception traceback and lines found by Find in Files.Also available in the context menu of the Shell window and Output windows.
需要手动关闭文件，代码会显得更加冗长：f=open('file.txt','r')data=f.read()f.close()因此，在...
16、The with statement creates what’s called a context: when the with block ends, Python will automatically close the file, even if an exception is raised inside the with block. There’s nothing file-specific about the with statement; it’s just a generic framework for creating runtime con...
file = open("1.txt") data = file.read() file.close() 1. 2. 3. 上面代码存在2个问题: ①文件读取发生异常,但没有进行任何处理; ②可能忘记关闭文件句柄; 改进 try: f = open('xxx') except: print('fail to open') exit(-1) try: ...
Close 关闭 Close the current window (ask to save if unsaved) 关闭当前窗口(如果未保存则要求保存)。 Exit 退出 Close all windows and quit lDLE (ask to save unsaved windows) 关闭所有窗口并退出空闲状态(要求保存未保存的 窗口)。 图2 File菜单 二、编辑(Edit)菜单 主要是编程过程中对代码的编辑操作,...
with open('file.txt', 'r') as f: # do something with the file # the file will be automatically closed when the block exits # or f = open('file.txt', 'r') try: # do something with the file finally: f.close() # the file will be closed no matter what happens in the try ...
"" pass class ExecFileErr(Exception): """Execute file error.""" pass class ZTPAbort(Exception): """Abort ZTP automatically.""" pass class ZTPRollback(Exception): """ZTP startup info rollback.""" pass def ops_conn_operation(func): def wapper(*args, **kwargs): ops_conn = ops....