os.path模塊如何工作？

Question

os.path是python中的模塊，但是在安裝目錄中找不到名為os.path.py的文件。 但是其他模塊，例如os ， string等 ，我可以找到相應的實現文件os.py和string.py 。

現在，我想知道os.path模塊是如何工作的？

Answer 1

根據所使用的平台， os.path實際上是：

• Windows的ntpath.py
• posixpath.py於Linux的posixpath.py
• Mac OSX的macpath.py

os模塊在文件頂部說明了這一點：

r"""OS routines for NT or Posix depending on what system we're on.

This exports:
  - all functions from posix, nt, os2, or ce, e.g. unlink, stat, etc.
  - os.path is one of the modules posixpath, or ntpath
  - os.name is 'posix', 'nt', 'os2', 'ce' or 'riscos'
  - os.curdir is a string representing the current directory ('.' or ':')
  - os.pardir is a string representing the parent directory ('..' or '::')
  - os.sep is the (or a most common) pathname separator ('/' or ':' or '\\')
  - os.extsep is the extension separator ('.' or '/')
  - os.altsep is the alternate pathname separator (None or '/')
  - os.pathsep is the component separator used in $PATH etc
  - os.linesep is the line separator in text files ('\r' or '\n' or '\r\n')
  - os.defpath is the default search path for executables
  - os.devnull is the file path of the null device ('/dev/null', etc.)

Programs that import and use 'os' stand a better chance of being
portable between different platforms.  Of course, they must then
only use functions that are defined by all platforms (e.g., unlink
and opendir), and leave all pathname manipulation to os.path
(e.g., split and join).
"""