New Post: How to do continuous Step Debugging[Step Over/Into] using PyKd

Thanks for your reply. I guess you were right when I thought its getting hanged because it was actually working hard. So I moved out of windbg and ruunnng the script externally. To test I modified the code in this way.

from pykd import *
from pykd import *

pid = raw_input(' Enter PID >>> ')
d=attachProcess(int(pid))
print d
while 1:
    dprintln('Hello!!')
    r_o = dbgCommand('r')
    dprintln(r_o)
    step()

Here I should continuously get "Hello" and "r" command output in command prompt. I get for few instruction, but after sometime it stopped printing "Hello" and "r" command output. Here is my out put

C:\Program Files (x86)\Debugging Tools for Windows (x86)\winext>python test.py
 Enter PID >>> 6736
0
Hello!!
eax=7ef64000 ebx=00000000 ecx=00000000 edx=777cf8ea esi=00000000 edi=00000000
eip=7774000c esp=0f6dfa94 ebp=0f6dfac0 iopl=0         nv up ei pl zr na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00000246
ntdll!DbgBreakPoint:
7774000c cc              int     3

Hello!!
eax=7ef64000 ebx=00000000 ecx=00000000 edx=777cf8ea esi=00000000 edi=00000000
eip=7774000d esp=0f6dfa94 ebp=0f6dfac0 iopl=0         nv up ei pl zr na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00000244
ntdll!DbgBreakPoint+0x1:
7774000d c3              ret

Hello!!
eax=7ef64000 ebx=00000000 ecx=00000000 edx=777cf8ea esi=00000000 edi=00000000
eip=777cf926 esp=0f6dfa98 ebp=0f6dfac0 iopl=0         nv up ei pl zr na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00000246
ntdll!DbgUiRemoteBreakin+0x3c:
777cf926 eb07            jmp     ntdll!DbgUiRemoteBreakin+0x45 (777cf92f)

Hello!!
eax=7ef64000 ebx=00000000 ecx=00000000 edx=777cf8ea esi=00000000 edi=00000000
eip=777cf92f esp=0f6dfa98 ebp=0f6dfac0 iopl=0         nv up ei pl zr na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00000246
ntdll!DbgUiRemoteBreakin+0x45:
777cf92f c745fcfeffffff  mov     dword ptr [ebp-4],0FFFFFFFEh ss:002b:0f6dfabc=00000000

Hello!!
eax=7ef64000 ebx=00000000 ecx=00000000 edx=777cf8ea esi=00000000 edi=00000000
eip=777cf936 esp=0f6dfa98 ebp=0f6dfac0 iopl=0         nv up ei pl zr na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00000246
ntdll!DbgUiRemoteBreakin+0x4c:
777cf936 6a00            push    0

Hello!!
eax=7ef64000 ebx=00000000 ecx=00000000 edx=777cf8ea esi=00000000 edi=00000000
eip=777cf938 esp=0f6dfa94 ebp=0f6dfac0 iopl=0         nv up ei pl zr na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00000246
ntdll!DbgUiRemoteBreakin+0x4e:
777cf938 e8df86fbff      call    ntdll!RtlExitUserThread (7778801c)

Hello!!
eax=00000000 ebx=00000000 ecx=00000000 edx=00000000 esi=00000000 edi=00000000
eip=77750096 esp=0f6dfa74 ebp=0f6dfa8c iopl=0         nv up ei pl zr na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00000246
ntdll!ZwTerminateThread+0x12:
77750096 83c404          add     esp,4

Is there anything extra I need to add to fix this.,