這個本身是小組朋友問的問題，感覺不錯，我給出的回答
問：
>>> os.path.isabs("/home")
True
>>> os.path.isabs("/home/..")
True
>>> os.path.isabs("home/..")
False
這裏第二個應該是相對路徑吧？ 應該返回False？
答：
首先，給段資料
The current os.path.isabs documentation says:
> isabs(path)
> Return True if path is an absolute pathname (begins with a slash).
The "begins with a slash" part is incorrect since certain systems use a
different pathname notation.
For example, on Macintosh (where os.sep == ":") this is an absolute
pathname:
hardDriveName:folderName1:folderName2:fileName.ext
...and this is a relative one:
:folderName1:fileName.ext
Moreover, on Windows os.path.isabs('\\') returns True since '\\' is an
alias for the current drive letter (e.g. C:\\) hence, independently from
what said before, the documentation should include also the "backslash"
term.
It turns out that on Windows there are really 4 different kinds of paths:
1) Completely relative, e.g. foo\bar
2) Completely absolute, e.g. c:\foo\bar or \\server\share
3) Halfbreeds with no drive, e.g. \foo\bar
4) Halfbreeds relative to the current working directory on a specific drive, e.g. c:foo\bar
Python 2.5's os.path.isabs() method considers both (2) and (3) to be absolute;
然後，分析
|這裏第二個應該是相對路徑吧？ 應該返回False？
根據， linux中absolute *is*
begins with a slash, so return True
說說，第三個吧，你除非在"/"目錄下，要不然在其他目錄下當然是錯的，應爲這個路徑就不對
而，我在"/"目錄下也試了，也返回False，那是因爲沒有以slash開始
linux中，你只用記下上面那句話就好，其他系統看上面的資料