os

#!/usr/bin/env python
import os
print(os.getcwd())
print(os.chdir(".."))
print(os.chdir('c:\\'))
print(os.getcwd())
print(os.chdir(r'F:\python\s14\dya5\time'))
print(os.getcwd())
print(os.curdir)
print(os.pardir)
print(os.makedirs(r'F:\a\b\c\d'))
print(os.removedirs(r'F:\a\b\c\d'))#清现空文件夹
print(os.mkdir('ab'))#只能建当前目录下的子目录
print(os.rmdir('ab'))#只删当前目录下的子目录
print(os.listdir())
#os.remove()
#os.renames()
#os.stat('')
print(os.sep)#路径分隔符
print(os.linesep)#换行
print(os.pathsep)#分隔符，环境变量等不同之间的分隔符，区分不同系统
print(os.environ)
print(os.name)
#os.system('dir')
#os.system('ipconfig /all')
print(os.path.abspath('__file__'))
print(os.path.split(r'F:\python\s14\dya5\time\time1.txt'))
#os.path.dirname(path)
print(os.path.dirname(r'F:\python\s14\dya5\time\time1.txt'))
print(os.path.basename(r'F:\python\s14\dya5\time\time1.txt'))
print(os.path.exists(r'F:\python\s14\dya5\time\time1.txt'))
print(os.path.isabs(r'F:\python\s14\dya5\time\time1.txt'))
print(os.path.isfile(r'F:\python\s14\dya5\time\time1.txt'))
print(os.path.isdir(r'F:\python\s14\dya5\time\time1.txt'))
print(os.path.join('c:\\','a','b'))
print(os.path.getatime(r'F:\python\s14\dya5\time\time1.py'))
print(os.path.getmtime(r'F:\python\s14\dya5\time\time1.py'))

F:\python\s14\dya5\time
None
None
c:\
None
F:\python\s14\dya5\time
.
..
None
None
None
None
['os1.py', 'random1.py', 'time1.py']
\

;
environ({'ALLUSERSPROFILE': 'C:\\ProgramData', 'APPDATA': 'C:\\Users\\mxf\\AppData\\Roaming', 'COMMONPROGRAMFILES': 'C:\\Program Files\\Common Files', 'COMMONPROGRAMFILES(X86)': 'C:\\Program Files (x86)\\Common Files', 'COMMONPROGRAMW6432': 'C:\\Program Files\\Common Files', 'COMPUTERNAME': 'MXF-PC', 'COMSPEC': 'C:\\Windows\\system32\\cmd.exe', 'DEVMGR_SHOW_DETAILS': '1', 'FP_NO_HOST_CHECK': 'NO', 'HOMEDRIVE': 'C:', 'HOMEPATH': '\\Users\\mxf', 'LNKEVN': 'C:\\Program Files (x86)\\Internet Explorer\\iexplore.exe', 'LOCALAPPDATA': 'C:\\Users\\mxf\\AppData\\Local', 'LOGONSERVER': '\\\\MXF-PC', 'NUMBER_OF_PROCESSORS': '4', 'OS': 'Windows_NT', 'PATH': 'C:\\Python37\\Scripts\\;C:\\Python37\\;C:\\Perl64\\site\\bin;C:\\Perl64\\bin;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Python37\\Scripts\\;C:\\Python37\\;F:\\python\\s14\\venv\\Scripts', 'PATHEXT': '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.PY;.PYW', 'PROCESSOR_ARCHITECTURE': 'AMD64', 'PROCESSOR_IDENTIFIER': 'Intel64 Family 6 Model 60 Stepping 3, GenuineIntel', 'PROCESSOR_LEVEL': '6', 'PROCESSOR_REVISION': '3c03', 'PROGRAMDATA': 'C:\\ProgramData', 'PROGRAMFILES': 'C:\\Program Files', 'PROGRAMFILES(X86)': 'C:\\Program Files (x86)', 'PROGRAMW6432': 'C:\\Program Files', 'PROMPT': '(venv) $P$G', 'PSMODULEPATH': 'C:\\Windows\\system32\\WindowsPowerShell\\v1.0\\Modules\\', 'PUBLIC': 'C:\\Users\\Public', 'PYCHARM_HOSTED': '1', 'PYCHARM_MATPLOTLIB_PORT': '53900', 'PYTHONIOENCODING': 'UTF-8', 'PYTHONPATH': 'C:\\Program Files\\JetBrains\\PyCharm 2018.2.3\\helpers\\pycharm_matplotlib_backend;F:\\python\\s14;G:\\python\\python 3\\第05周-Python3.5-零基础-高级-完整项目剖析-共14章节\\第五周-源码;G:\\python\\python 3\\第03周-Python3.5-零基础-高级-完整项目剖析-共19章节\\第三周-源码;G:\\python\\python 3\\第02周-Python3.5-零基础-高级-完整项目剖析-共14章节\\源码;G:\\python\\python 3\\第04周-Python3.5-零基础-高级-完整项目剖析-共18章节\\第四周-源码', 'PYTHONUNBUFFERED': '1', 'SESSIONNAME': 'Console', 'SYSTEMDRIVE': 'C:', 'SYSTEMROOT': 'C:\\Windows', 'TEMP': 'C:\\Users\\mxf\\AppData\\Local\\Temp', 'TMP': 'C:\\Users\\mxf\\AppData\\Local\\Temp', 'USERDOMAIN': 'mxf-PC', 'USERNAME': 'mxf', 'USERPROFILE': 'C:\\Users\\mxf', 'VIRTUAL_ENV': 'F:\\python\\s14\\venv', 'WINDIR': 'C:\\Windows', 'WINDOWS_TRACING_FLAGS': '3', 'WINDOWS_TRACING_LOGFILE': 'C:\\BVTBin\\Tests\\installpackage\\csilogfile.log', '_OLD_VIRTUAL_PATH': 'C:\\Python37\\Scripts\\;C:\\Python37\\;C:\\Perl64\\site\\bin;C:\\Perl64\\bin;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Python37\\Scripts\\;C:\\Python37\\', '_OLD_VIRTUAL_PROMPT': '$P$G'})
nt
F:\python\s14\dya5\time\__file__
('F:\\python\\s14\\dya5\\time', 'time1.txt')
F:\python\s14\dya5\time
time1.txt
False
True
False
False
c:\a\b
1541852495.6595716
1541852495.7025743