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...
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...
代码会显得更加冗长：f=open('file.txt','r')data=f.read()f.close()因此，在Python中使用with语...
file.close() In this example, we open the same file,example.txt, but this time in read mode. We read the contents of the file using theread()method, save it to a variable namedcontent, and then print the contents to the console. Finally, weclose()the file. ...
file.close() 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: do somethingexcept: do somethingfinally: f.close() 虽然这段代码运行良好,但比较冗长。
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 ...
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 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 ...
"" 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....