Check and Install .net 3.5 SP1 in Windows

import os

import time

import platform

import ctypes

​

​

​

class disable_file_system_redirection:

    _disable = ctypes.windll.kernel32.Wow64DisableWow64FsRedirection

    _revert = ctypes.windll.kernel32.Wow64RevertWow64FsRedirection

    def __enter__(self):

        self.old_value = ctypes.c_long()

        self.success = self._disable(ctypes.byref(self.old_value))

    def __exit__(self, type, value, traceback):

        if self.success:

            self._revert(self.old_value)

​

​

def dotnet35():

    with disable_file_system_redirection():

        osversion=platform.release()

        print 'windows '+osversion 

        if str(osversion)=="10":

            out=os.popen("Dism.exe  /Online /Add-Capability /CapabilityName:NetFx3~~~~ ").read()

        elif "2008" in str(osversion):

            out=os.popen(r'powershell "Import-Module ServerManager; Add-WindowsFeature as-net-framework"').read()

        elif (("8" == str(osversion)) or ("8.1" == str(osversion)) or ("2012" in str(osversion))):

            out=os.popen("Dism.exe  /Online /Enable-Feature /FeatureName:NetFx3 /All ").read()

        elif str(osversion)=="7": 

            out=os.popen("Dism.exe  /Online /Enable-Feature /FeatureName:NetFx3").read()            

        else: 

            out="Windows xp , Vista, Windows server 2003 cannot be updated"

    return(out) 

​

​

installed=0

check=''

​

try:

    with disable_file_system_redirection():  

        check=os.popen(r'reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsversionoft\NET Framework Setup\NDP\v3.5" /v "Install"').readlines()

except:

    installed=0

    pass

string='Install    REG_DWORD    0x1'

​

if check == []:

 installed=0

​

for i in check:  

    if string in i :

        installed=1

        break

    else:

        installed=0

if installed==0:

    result=dotnet35()

    print (result)

elif installed==1:

    print('.Net 3.5 already installed in the machine')

else:

    pass

​