Python实现给文件添加内容及得到文件信息的方法
Jun 10, 2016 pm 03:11 PM
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本文实例讲述了Python实现给文件添加内容及得到文件信息的方法。分享给大家供大家参考。具体分析如下：
经常会遇到给文件添加内容的时候，如果只是添加在文件的末尾，就比较简单了：
file = open(filename,'a')
file.write('hello')
file.close()
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使用'a'模式打开文件后，指针默认指向文件末尾，即使你：
file.seek(0)
file.write('world')
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字符串‘world'还是会加在文件的末尾，而不会是你想要的开始位置。
而我遇到的需求就是要在文件头添加东西啊，怎么办呢？不至于把里面东西全读出来，再写进去吧？
还好看到了'r+'这个模式(以前从来没有用过)
file = open(filename,'r+')
file.tell() #0L
file.write('begin')
file.close()
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打开文件看看，是不是可以了呢;)
得到文件的修改时间：
>>> t = os.path.getmtime(path) >>> t 1190626843 >>> type(t) <type 'int'> >>> os.stat(path)[8] 1190626843
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得到文件的大小：
>>> os.stat(path)[6] 2808L >>> os.path.getsize(path) 2808L
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希望本文所述对大家的Python程序设计有所帮助。
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