stdin, stdout, stderr = ssh.exec_command('cmd /c dir "D:"')

stdin, stdout, stderr = ssh.exec_command('if [[ -d /cygdrive/d/log ]]; then echo Exists; fi')

if_exist_path = "cmd /c if exist "" + log_path + "" echo Exists"
stdin, stdout, stderr = ssh.exec_command(if_exist_path)

import paramiko
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect("10.9.8.7", username="FakeUser", password="FakePassword")
log_path = "D:\Log"
if_exist_path = "cmd /c if exist "" + log_path + "" echo Exists"
print("Var 'if_path_exist' is: {}".format(if_exist_path))
stdin, stdout, stderr = ssh.exec_command(if_exist_path)
stdoutput = stdout.readlines()
stderror = stderr.readlines()
print("First Stdout is {}".format(stdoutput))
print("First Stderr is {}".format(stderror))
print("")
stdin, stdout, stderr = ssh.exec_command('cmd /c dir "D:\Log"')
stdoutput = stdout.read()
stderror = stderr.read()
print("Second Stdout is {}".format(stdoutput))
print("Second Stderr is {}".format(stderror))
print("")
stdin, stdout, stderr = ssh.exec_command('cmd /c dir "D:"')
stdoutput = stdout.read()
stderror = stderr.read()
print("Third Stdout is {}".format(stdoutput))
print("Third Stderr is {}".format(stderror))
print("")
stdin, stdout, stderr = ssh.exec_command('cmd /c dir "D:\"')
stdoutput = stdout.read()
stderror = stderr.read()
print("Fourth Stdout is {}".format(stdoutput))
print("Fourth Stderr is {}".format(stderror))
print("")
stdin, stdout, stderr = ssh.exec_command('cmd /c dir "D:Log"')
stdoutput = stdout.read()
stderror = stderr.read()
print("Fifth Stdout is {}".format(stdoutput))
print("Fifth Stderr is {}".format(stderror))
print("")
stdin, stdout, stderr = ssh.exec_command('cmd /c dir "D:Log"')
stdoutput = stdout.read()
stderror = stderr.read()
print("Sixth Stdout is {}".format(stdoutput))
print("Sixth Stderr is {}".format(stderror))
print("")

C:Scripts>SO_Test.py
Var 'if_path_exist' is: cmd /c if exist "D:Log" echo Exists
First Stdout is []
First Stderr is []

Second Stdout is  Volume in drive D is Apps
 Volume Serial Number is xxxx-xxxx

 Directory of D:


Second Stderr is File Not Found


Third Stdout is  Volume in drive D is Apps
 Volume Serial Number is xxxx-xxxx

 Directory of D:

01/26/2017  10:49 PM    <DIR>          Log
01/12/2017  11:34 AM            12,887 Blah.ps1
01/12/2017  01:16 PM            12,082 result.txt
12/12/2016  03:39 PM            23,340 Blahv201.zip
04/15/2017  10:37 PM    <DIR>          Company
01/27/2017  08:19 PM    <DIR>          CompanyBackup
01/12/2017  01:08 PM            10,060 Untitled1.ps1
               4 File(s)         58,369 bytes
               3 Dir(s)  175,276,904,448 bytes free

Third Stderr is

Fourth Stdout is
Fourth Stderr is sh: -c: line 0: unexpected EOF while looking for matching `"'
sh: -c: line 1: syntax error: unexpected end of file

Fifth Stdout is  Volume in drive D is Apps
 Volume Serial Number is xxxx-xxxx

 Directory of D:


Fifth Stderr is File Not Found

Sixth Stdout is  Volume in drive D is Apps
 Volume Serial Number is xxxx-xxxx

 Directory of D:


Sixth Stderr is File Not Found

if os.path.isdir("/test/to/dir") == True:

    print('dir exists ')

    # you next actions