Error in Plex 1.1.4.1

[srijit]

Hello,
I got the following error while using Plex 1.1.4.1

D:\Python24\myfiles>python plex1.py
Traceback (most recent call last):
  File "plex1.py", line 1, in ?
from Plex import *
  File "D:\python24\lib\site-packages\Plex\__init__.py", line 34, in ?
from Lexicons import Lexicon, State
  File "D:\python24\lib\site-packages\Plex\Lexicons.py", line 12, in ?
import DFA
  File "D:\python24\lib\site-packages\Plex\DFA.py", line 9, in ?
import Machines
  File "D:\python24\lib\site-packages\Plex\Machines.py", line 14, in ?
from Transitions import TransitionMap
  File "D:\python24\lib\site-packages\Plex\Transitions.py", line 85
def get_epsilon(self,
SyntaxError: Invalid syntax.  Assignment to None.

The corresponding source code :

#file plex1.py

from Plex import *

lexicon = Lexicon([
(Str("Python"),  "my_favourite_language"),
(Str("Perl"),"the_other_language"),
(Str("rocks"),   "is_excellent"),
(Str("sucks"),   "is_differently_good"),
(Rep1(Any(" \t\n")), IGNORE)
])

filename = "plex1.txt"
f = open(filename, "r")
scanner = Scanner(lexicon, f, filename)
while 1:
token = scanner.read()
print token
if token[0] is None:
break

The error was removed when I used the following code in Transitions.py

def get_epsilon(self,
none = None):
"""
Return the mapping for epsilon, or None.
"""
return self.special.get('', None)


Regards,
Srijit
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Re: FTPLIB & FTPS or SFTP?

[srijit]

To the best of my knowledge ftplib does not support SFTP or FTPS.
I hope Paramiko (http://www.lag.net/paramiko/) serves your purpose.
Paramiko supports POSIX, Windows and MacOSX

Regards,
/Srijit

Peter A. Schott wrote:
> Does the ftplib support SFTP or FTPS?  Is that part of a different
module?  We
> have a handful of partners who use FTPS or SFTP and I need to
pull/push files
> to/from them.
> 
> 
> Thank you for all of your help.
> 
> -Pete Schott

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Memory mapped File (Python win32 extensions)

[Srijit Kumar Bhadra]

Hello,
I see that it is possible to use mmapfile.pyd of win32all. The same is
mentioned in http://www.python.org/windows/win32/#mmapfile.

Unfortunately I could not trace any example using mmapfile.

Any example or link to an example will be of help. I am interested to
learn how to achieve efficient sharing of data between separate
processes using mmapfile.

Regards,
/Srijit

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Shared Memory Example (Python, ctypes, VC++)

[Srijit Kumar Bhadra]

Hello,
Here are code snippets to create and access shared memory in Python
with and without ctypes module.

With regards,
Srijit

Filename : SharedMemCreate.py

import msvcrt, mmap
from ctypes import *

FILE_MAP_ALL_ACCESS = 0xF001F
INVALID_HANDLE_VALUE = 0x
SHMEMSIZE = 256
PAGE_READWRITE = 0x04
szName = c_char_p("MyFileMappingObject_ctypes")
szMsg = "Message from Python(ctypes) process"

hMapObject = windll.kernel32.CreateFileMappingA(INVALID_HANDLE_VALUE,
None, PAGE_READWRITE, 0, SHMEMSIZE, szName)
if (hMapObject == 0):
print "Could not open file mapping object"
raise WinError()

pBuf = windll.kernel32.MapViewOfFile(hMapObject, FILE_MAP_ALL_ACCESS,
0, 0, SHMEMSIZE)
if (pBuf == 0):
print "Could not map view of file"
raise WinError()
else:
memcpy = cdll.msvcrt.memcpy
memcpy(pBuf, szMsg, len(szMsg))

shmem = mmap.mmap(0, 256, "MyFileMappingObject", mmap.ACCESS_WRITE)
shmem.write("Message from Python process")

msvcrt.getch()

windll.kernel32.UnmapViewOfFile(pBuf)
windll.kernel32.CloseHandle(hMapObject)
shmem.close()

Filename : SharedMemAccess.py

from ctypes import *
import mmap

FILE_MAP_ALL_ACCESS = 0xF001F
INVALID_HANDLE_VALUE = 0x
FALSE = 0
TRUE = 1
SHMEMSIZE = 256
szName = c_char_p("MyFileMappingObject")

hMapObject = windll.kernel32.OpenFileMappingA(FILE_MAP_ALL_ACCESS,
FALSE, szName)
if (hMapObject == 0):
print "Could not open file mapping object"
raise WinError()

pBuf = windll.kernel32.MapViewOfFile(hMapObject, FILE_MAP_ALL_ACCESS,
0, 0, 0)

if (pBuf == 0):
print "Could not map view of file"
raise WinError()
else:
pBuf_str = cast(pBuf, c_char_p)
print pBuf_str.value

windll.kernel32.UnmapViewOfFile(pBuf)
windll.kernel32.CloseHandle(hMapObject)

shmem = mmap.mmap(0, 256, "MyFileMappingObject_ctypes",
mmap.ACCESS_READ)
print shmem.read(64)
shmem.close()


Source code to access shared memory, created in Python, from VC++
program

// Cplusplus_SharedMemoryAccess.cpp : Defines the entry point for the
console application.
//

#include "stdafx.h"
using namespace std;

#include 
#include 
#include 
#include 

#define SHMEMSIZE 256

HANDLE hMapObject = NULL;  // handle to file mapping
LPCTSTR pBuf;
TCHAR szName[]= TEXT("MyFileMappingObject");

int _tmain(int argc, _TCHAR* argv[])
{
   hMapObject = OpenFileMapping(
   FILE_MAP_ALL_ACCESS,   // read/write access
   FALSE, // do not inherit the name
   szName // name of mapping object
   );

   if (hMapObject == NULL || hMapObject == INVALID_HANDLE_VALUE) {
  cout << "Could not open file mapping object " << GetLastError()
<< endl;
  return 0;
   }
   pBuf = (LPTSTR) MapViewOfFile(hMapObject,// handle to mapping
object
   FILE_MAP_ALL_ACCESS, // read/write
permission
   0,
   0,
   SHMEMSIZE
   );

   if (pBuf == NULL)
   {
  cout << "Could not map view of file "  << GetLastError() << endl;

  return 0;
   }

   cout << "pBuf = " << pBuf << endl;
   MessageBox(NULL, pBuf, TEXT("Process2"), MB_OK);

   UnmapViewOfFile(pBuf);
   CloseHandle(hMapObject);

   return 0;
}

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Python 2.4 (Windows) Binaries of SciPy

[Srijit Kumar Bhadra]

Hello,
I have posted a similar message in SciPy mailing list. I hope it is ok
to also post it here.

I am looking for Python 2.4 Binaries (Windows)of SciPy. Are there any
plans to upload Python 2.4 binaries?

Best Regards,
/Srijit

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Example Code - Named Pipes (Python 2.4 + ctypes on Windows)

[Srijit Kumar Bhadra]

Hello,
Here is an example of Multithreaded Pipe Server and Client using the
excellent ctypes library (Windows).

Reference - MSDN:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/ipc/base/multithreaded_pipe_server.asp
 and
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/ipc/base/named_pipe_client.asp

Best Regards,
Srijit

Named Pipe Server Source Code:

from ctypes import *

PIPE_ACCESS_DUPLEX = 0x3
PIPE_TYPE_MESSAGE = 0x4
PIPE_READMODE_MESSAGE = 0x2
PIPE_WAIT = 0
PIPE_UNLIMITED_INSTANCES = 255
BUFSIZE = 4096
NMPWAIT_USE_DEFAULT_WAIT = 0
INVALID_HANDLE_VALUE = -1
ERROR_PIPE_CONNECTED = 535

MESSAGE = "Default answer from server\0"
szPipename = ".\\pipe\\mynamedpipe"


def ReadWrite_ClientPipe_Thread(hPipe):
chBuf = create_string_buffer(BUFSIZE)
cbRead = c_ulong(0)
while 1:
fSuccess = windll.kernel32.ReadFile(hPipe, chBuf, BUFSIZE,
byref(cbRead), None)
if ((fSuccess ==1) or (cbRead.value != 0)):
print chBuf.value
cbWritten = c_ulong(0)
fSuccess = windll.kernel32.WriteFile(hPipe,
 c_char_p(MESSAGE),
 len(MESSAGE),
 byref(cbWritten),
 None
)
else:
break
if ( (not fSuccess) or (len(MESSAGE) != cbWritten.value)):
print "Could not reply to the client's request from the
pipe"
break
else:
print "Number of bytes written:", cbWritten.value

windll.kernel32.FlushFileBuffers(hPipe)
windll.kernel32.DisconnectNamedPipe(hPipe)
windll.kernel32.CloseHandle(hPipe)
return 0

def main():
THREADFUNC = CFUNCTYPE(c_int, c_int)
thread_func = THREADFUNC(ReadWrite_ClientPipe_Thread)
while 1:
hPipe = windll.kernel32.CreateNamedPipeA(szPipename,
 PIPE_ACCESS_DUPLEX,
 PIPE_TYPE_MESSAGE |
 PIPE_READMODE_MESSAGE
|
 PIPE_WAIT,

PIPE_UNLIMITED_INSTANCES,
 BUFSIZE, BUFSIZE,

NMPWAIT_USE_DEFAULT_WAIT,
 None
)
if (hPipe == INVALID_HANDLE_VALUE):
print "Error in creating Named Pipe"
return 0

fConnected = windll.kernel32.ConnectNamedPipe(hPipe, None)
if ((fConnected == 0) and (windll.kernel32.GetLastError() ==
ERROR_PIPE_CONNECTED)):
fConnected = 1
if (fConnected == 1):
dwThreadId = c_ulong(0)
hThread = windll.kernel32.CreateThread(None, 0,
thread_func, hPipe, 0, byref(dwThreadId))
if (hThread == -1):
print "Create Thread failed"
return 0
else:
windll.kernel32.CloseHandle(hThread)
else:
print "Could not connect to the Named Pipe"
windll.kernel32.CloseHandle(hPipe)
return 0


if __name__ == "__main__":
main()



Named Pipe Client Source Code:

from ctypes import *

GENERIC_READ = 0x8000
GENERIC_WRITE = 0x4000
OPEN_EXISTING = 0x3
INVALID_HANDLE_VALUE = -1
PIPE_READMODE_MESSAGE = 0x2
ERROR_PIPE_BUSY = 231
ERROR_MORE_DATA = 234
BUFSIZE = 512

MESSAGE = "Default message from client\0"
szPipename = ".\\pipe\\mynamedpipe"

def main():
while 1:
hPipe = windll.kernel32.CreateFileA(szPipename, GENERIC_READ |
GENERIC_WRITE, 0, None, OPEN_EXISTING, 0, None)
if (hPipe != INVALID_HANDLE_VALUE):
 break
else:
print "Invalid Handle Value"
if (windll.kernel32.GetLastError() != ERROR_PIPE_BUSY):
print "Could not open pipe"
return
elif ((windll.kernel32.WaitNamedPipeA(szPipename, 2)) ==
0):
print "Could not open pipe\n"
return


dwMode = c_ulong(PIPE_READMODE_MESSAGE)
fSuccess = windll.kernel32.SetNamedPipeHandleState(hPipe,
byref(dwMode), None, None);
if (not fSuccess):
print "SetNamedPipeHandleState failed"
cbWritten = c_ulong(0)
fSuccess = windll.kernel32.WriteFile(hPipe, c_char_p(MESSAGE),
len(MESSAGE), byref(cbWritten), None)
if ((not fSuccess) or (len(MESSAGE) != cbWritten.value)):
print "Write File failed"
return
else:
print "Number of bytes written:", cbWritten.value

fSuccess = 0
chBuf = create_string_buffer(BUFSIZE)
cbRead = c_ulong(0)
while (not fSuccess): # repeat loop if ERROR_MORE_DATA
fSuccess = windl

Re: Example Code - Named Pipes (Python 2.4 + ctypes on Windows)

[Srijit Kumar Bhadra]

Hello,
I am quite familiar with Mark Hammond's win32all. It is excellent.
However, I wish that there was more documentation of win32all beyond
existing PyWin32.chm. I am aware of "Python Programming on Win32" but I
do not have access to it at present.

Best Regards,
/Srijit

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Example Code : Shared Memory with Mutex (pywin32 and ctypes)

[Srijit Kumar Bhadra]

Hello,
Here is some sample code with pywin32 build 203 and ctypes 0.9.6.

Best regards,
/Srijit

File: SharedMemCreate_Mutex_win32all.py

# This application should be used with SharedMemAccess_Mutex_ctypes.py
or SharedMemAccess_Mutex_win32all.py
#~ a) Creates a shared memory
#~ b) Creates or Opens a mutex
#~ c) Reads the contents (null terminated string) of shared memory
#~ d) Acquires a mutex and then writes a null terminated string to the
shared memory
#~ e) Sleeps upto 2 seconds. Sleep time is generated by a random number
#~ f) Repeats steps (c), (d) and (e) indefintely

import mmap, random, time
import win32event, pywintypes, win32api

def main():
SHMEMSIZE = 256

ERROR_ALREADY_EXISTS = 183

szName = "MyFileMappingObject"
szMsg1 = "Message from first process using win32all and mmap - "
szMutex = "MyMutexObject"

shmem = mmap.mmap(0, SHMEMSIZE, szName, mmap.ACCESS_WRITE)

try:
hMutex = win32event.CreateMutex(None, pywintypes.FALSE,
szMutex)
if (win32api.GetLastError() == ERROR_ALREADY_EXISTS):
print"Opened existing mutex object", szMutex
else:
print "Created new mutex"

i=0
random.seed()
while 1:
szMsg1 = szMsg1 + hex(i) + "\0"
if (len(szMsg1) > SHMEMSIZE):
print "Current size of string message is", len(szMsg1),
"and greater than", SHMEMSIZE
break
shmem_read = shmem.read(SHMEMSIZE)
shmem_read = shmem_read.rstrip(chr(0))
shmem_read = shmem_read.rstrip(" ")
print "RECEIVED from SECOND Process: ", shmem_read
shmem.seek(0)
wait_result = win32event.WaitForSingleObject(hMutex, 1000)
if (wait_result == win32event.WAIT_OBJECT_0):
shmem.write(szMsg1)
while (shmem.tell() != SHMEMSIZE):
shmem.write_byte(" ")
shmem.seek(0)
print "WROTE in FIRST process: ", szMsg1
win32event.ReleaseMutex(hMutex)
elif(wait_result == win32event.WAIT_TIMEOUT):
 print "COULD NOT ACQUIRE MUTEX. TIMEOUT OCCURED"
elif (wait_result == win32event.WAIT_ABONDONED):
 print "WAIT ABANDONED"
i = i + 1
szMsg1 = "Message from first process using win32all and
mmap - "
time.sleep(random.random()*2)

except pywintypes.error, (errno, object, strerror):
print "Error in", object, ":", strerror

if __name__ == "__main__":
main()


File: SharedMemCreate_Mutex_ctypes.py

# This application should be used with SharedMemAccess_Mutex_ctypes.py
or SharedMemAccess_Mutex_win32all.py
#~ a) Creates a shared memory
#~ b) Creates or Opens a mutex
#~ c) Reads the contents (null terminated string) of shared memory
#~ d) Acquires a mutex and then writes a null terminated string to the
shared memory
#~ e) Sleeps upto 2 seconds. Sleep time is generated by a random number
#~ f) Repeats steps (c), (d) and (e) indefintely


# There are two options to implement this code - Option A or Option B.
If Option B(A) is chosen then
# Option A(B) should be commented.
import random, time
from ctypes import *

def main():
try:
SHMEMSIZE = 256

TRUE = 1
FALSE = 0
ERROR_ALREADY_EXISTS = 183
FILE_MAP_ALL_ACCESS = 0xF001F
WAIT_OBJECT_0 = 0
WAIT_TIMEOUT = 0x102
WAIT_ABANDONED = 0x80
PAGE_READWRITE = 0x04
INVALID_HANDLE_VALUE = 0x

szName = "MyFileMappingObject"
szMsg1 = "Message from first process using ctypes - "
szMutex = "MyMutexObject"

hMutex = windll.kernel32.CreateMutexA(None, FALSE, szMutex)
if (hMutex == 0):
raise WinError()
elif (windll.kernel32.GetLastError() == ERROR_ALREADY_EXISTS):
print"Opened existing mutex object", szMutex
else:
print "Created new mutex"

hMap = windll.kernel32.CreateFileMappingA(INVALID_HANDLE_VALUE,
None, PAGE_READWRITE, 0, SHMEMSIZE, szName)
if (hMap == 0):
print "Could not open file mapping object"
raise WinError()

MapViewOfFile = windll.kernel32.MapViewOfFile
MapViewOfFile.restype = POINTER(c_char) # Option A
pBuf = MapViewOfFile(hMap, FILE_MAP_ALL_ACCESS, 0, 0, 0)
if (pBuf == 0):
raise WinError()

i=0
random.seed()
while 1:
szMsg1 = szMsg1 + hex(i) + "\0"
pBuf_str = cast(pBuf, c_char_p) # Option A
if (len(szMsg1) > SHMEMSIZE):
print "Current size of string message is", len(szMsg1),
"and greater th

Modelica

[Srijit Kumar Bhadra]

I am looking for possible options to interface Modelica
(http://www.modelica.org/) with Python (scipy and numpy). Any
suggestions?

Best Regards,
Srijit

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Re: Modelica

[Srijit Kumar Bhadra]

Is it possible to process Modelica models with Python?
I found one possible approach:
(a) Use ModelicaXML (http://www.ida.liu.se/~adrpo/ModelicaXML) to
represent Modelica code as XML
(b) Generate Python code (using numpy and scipy) from this XML file.

Is there any better approach?

Best Regards,
Srijit

[EMAIL PROTECTED] wrote:

> Srijit Kumar Bhadra wrote:
> > I am looking for possible options to interface Modelica
> > (http://www.modelica.org/) with Python (scipy and numpy). Any
> > suggestions?
>
> When you say "interface", what do you mean?
>
> Do you want to be able to process Modelica models or do you simply want
> to be able to communicate with a Modelica tool.
> 
> > Best Regards,
> > Srijit
> 
> --
> Mike

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lxml and SimpleXMLWriter

[Srijit Kumar Bhadra]

I am new to lxml. I am interested to know the equivalent code using
lxml (http://cheeseshop.python.org/pypi/lxml/1.1alpha). The code is
taken from http://effbot.org/zone/xml-writer.htm

from elementtree.SimpleXMLWriter import XMLWriter
import sys

w = XMLWriter(sys.stdout)

html = w.start("html")

w.start("head")
w.element("title", "my document")
w.element("meta", name="generator", value="my application 1.0")
w.end()

w.start("body")
w.element("h1", "this is a heading")
w.element("p", "this is a paragraph")

w.start("p")
w.data("this is ")
w.element("b", "bold")
w.data(" and ")
w.element("i", "italic")
w.data(".")
w.end("p")

w.close(html)

Best Regards,
Srijit

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Python *eggs* on Win32

[Srijit Kumar Bhadra]

I have browsed the following links
1) http://peak.telecommunity.com/DevCenter/EasyInstall
2) When Python *Eggs* better than Python *distutils*?? What's Eggs?
(http://tinyurl.com/m8dyd)

But I am still not clear what to do with an .egg file. For example, if
I have a basic Python installation
(http://www.python.org/ftp/python/2.4.3/python-2.4.3.msi) what should I
do with a typical .egg file (e.g.
http://cheeseshop.python.org/packages/2.4/l/lxml/lxml-1.1alpha-py2.4-static-win32.egg)?

I have only MinGW GCC compiler on my Win XP machine. Is it mandatory to
have Internet connection during installation of .egg files?

Best Regards,
Srijit

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Re: Python *Eggs* on Win32

[Srijit Kumar Bhadra]

I got the answers myself. Thanks to http://tinyurl.com/ld2c9. With just
basic installation of Python on Win32 (i.e.
http://www.python.org/ftp/python/2.4.3/python-2.4.3.msi) it is possible
to install .egg files (Python Eggs).

1) download http://peak.telecommunity.com/dist/ez_setup.py
2) run ez_setup.py
3) download
http://cheeseshop.python.org/packages/2.4/l/lxml/lxml-1.1alpha-py2.4-static-win32.egg
4) In dos command line go to the same directory where
lxml-1.1alpha-py2.4-static-win32.egg has been downloaded
5) From dos command line type
d:\python24\scripts\easy_install lxml-1.1alpha.win32-static-py2.4.exe

That's all. But Note:
a) for running ez_setup.py (which is a bootstrap module) unrestricted
Internet connection is necessary.

http://peak.telecommunity.com/DevCenter/EasyInstall?action=highlight&value=EasyInstall
has all the answers.

I am still not sure:
a) Whether it is always sufficient to have only MinGW GCC installation
on my Win XP machine and not MS Visual Studio.

Best Regards,
Srijit

Srijit Kumar Bhadra wrote:
> I have browsed the following links
> 1) http://peak.telecommunity.com/DevCenter/EasyInstall
> 2) When Python *Eggs* better than Python *distutils*?? What's Eggs?
> (http://tinyurl.com/m8dyd)
>
> But I am still not clear what to do with an .egg file. For example, if
> I have a basic Python installation
> (http://www.python.org/ftp/python/2.4.3/python-2.4.3.msi) what should I
> do with a typical .egg file (e.g.
> http://cheeseshop.python.org/packages/2.4/l/lxml/lxml-1.1alpha-py2.4-static-win32.egg)?
>
> I have only MinGW GCC compiler on my Win XP machine. Is it mandatory to
> have Internet connection during installation of .egg files?
> 
> Best Regards,
> Srijit

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Re: Python at MS Event!

[Srijit Kumar Bhadra]

Was it IronPython 0.7.x or standard Python 2.4.1?

Regards,
/Srijit

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SIP examples

[Srijit Kumar Bhadra]

I am trying to learn SIP (http://www.riverbankcomputing.co.uk/sip/)
these days. I do not see any examples similar to SWIG. 
http://www.swig.org/doc.html
has lots of examples. But for SIP, all I see is a reference guide
(http://www.riverbankcomputing.com/Docs/sip4/sipref.html).
Examples help. Where can I get examples for SIP 4.7?

Regards,
/Srijit

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MinGW and Python

[Srijit Kumar Bhadra]

Is there any specific reason for not using MinGW to build the official
distribution of Python for Win32?
A quick Google search did not reveal the answer to my question. If a
link is available, please post it.

Best Regards,
Srijit

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Python Wrapper Tools; a Performance Study

[Srijit Kumar Bhadra]

I am looking for the file Python Wrapper Tools; a Performance Study
(http://people.web.psi.ch/geus/talks/europython2004_geus.pdf). The
link seems to be no longer valid.

If someone has a local copy, I request him/her to share it.

/Srijit
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Cython Installation on Windows

[Srijit Kumar Bhadra]

Cython Installation on Windows documentation (http://wiki.cython.org/
InstallingOnWindows) needs a minor but important change.

Under section "MinGW Compiler" [build] compiler = mingw32 should be
replaced by the following lines (i.e. disutils.cfg should have the
following lines)

[build]
compiler=mingw32

/Srijit
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lxml 2.2.4 for Python 2.6

[Srijit Kumar Bhadra]

Is there any reason why lxml-2.2.4-py2.6-win32.egg  (md5) or
lxml-2.2.4.win32-py2.6.exe is not available?

Best regards,
/Srijit

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