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...
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 operations Python provides important...
# The file will be automatically closed when the with block is exited 因此，当使用with语句打开文...
屏幕更新关闭app=xw.App(visible=True,add_book=False) app.display_alerts=False app.screen_updating=False# 文件位置:filepath,打开test文档,然后保存,关闭,结束程序filepath=r'g:\Python Scripts\test.xlsx' wb=app.books.open(filepath) wb.save() wb.close() app.quit()...
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。
You may not know this, but file objects contain a special pair of built-in methods: __enter__() and __exit__(). The details aren't important, but what is important is that when a file object's __exit__() method is invoked, it automatically closes the file. How do we invoke ...
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...
"" 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....
视频游戏、社交网络和你的活动手环有什么共同点?它们运行在一群(或多或少)程序员在很远很远的地方编写的软件上。在我们这个技术驱动的社会中,小工具和硬件只是硬币更明显的一面。在这一章中,我们将讨论编程的基础知识。我们还将看看数字系统的可见部分:硬件。
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 AI检测代码解析 try: f = open('xxx') except: print('fail to open') ...