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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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