python os模块和os.path模块
2021/6/14 12:24:39
本文主要是介绍python os模块和os.path模块,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
一、os
python库中有os.py但是其中并没有定义相关函数,这些函数(例如:os.open , os.makdir)来自于其他文件
以下是os.pyt部分源代码
if 'posix' in _names: name = 'posix' linesep = '\n' from posix import try: from posix import _exit __all__.append('_exit') except ImportError: pass import posixpath as path try: from posix import _have_functions except ImportError: pass import posix __all__.extend(_get_exports_list(posix)) del posix elif 'nt' in _names: name = 'nt' linesep = '\r\n' from nt import try: from nt import _exit __all__.append('_exit') except ImportError: pass import ntpath as path import nt __all__.extend(_get_exports_list(nt)) del nt try: from nt import _have_functions except ImportError: pass
对于windows系统来说,程序会导入nt.py中的所有方法,因此可以直接使用os."函数名“来进行使用。
以下是nt.py文件中的部分函数
def mkdir(*args, **kwargs): # real signature unknown """ Create a directory. If dir_fd is not None, it should be a file descriptor open to a directory, and path should be relative; path will then be relative to that directory. dir_fd may not be implemented on your platform. If it is unavailable, using it will raise a NotImplementedError. The mode argument is ignored on Windows. """ pass def open(*args, **kwargs): # real signature unknown """ Open a file for low level IO. Returns a file descriptor (integer). If dir_fd is not None, it should be a file descriptor open to a directory, and path should be relative; path will then be relative to that directory. dir_fd may not be implemented on your platform. If it is unavailable, using it will raise a NotImplementedError. """ pass
二、os.path
import ntpath as path
os.py将ntpath模块导入并且重新命名为path,因此可以通过os.path来调用ntpath中的函数。(例如:os.path.exists,os.path.join())
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