multiprocessing and image aquisition [duplicate] - python

I am trying to the following code:
#!/usr/bin/python
import multiprocessing
def f(name):
print 'hello', name
if __name__ == '__main__':
p = multiprocessing.Process(target=f, args=('bob',))
p.start()
p.join()
The output I get is :
Traceback (most recent call last):
File "a.py", line 9, in <module>
p = multiprocessing.Process(target=f, args=('bob',))
AttributeError: 'module' object has no attribute 'Process'

You are trying to import multiprocessing from your local directory and not from the python library. The python interpreter first tries to import the module from the present directory. As you have got a file with the name multiprocessing.pyc in your directory, the interpreter is trying to import that. Hence you have got the error. Thus deleting multiprocessing.pyc will help resolve your problem.

Dont give the name of the file as "multiprocessing.py", give any other
thanks,
vybhav

The mistake was naming, my script as 'multiprocessing.py', once it was created. I made an another script with name 'a.py' and both of them were not working. After listing the directories, 'multiprocessing.pyc' was located. I deleted this file, and executed 'a.py' file which executed like gem!
thanks to #Bhargav Rao for highlighting

Don't give the name in the same directory as multiprocess.py, use different name instead.

Related

Print Data from PLC to Python using pycomm

I am trying to move data (a dint specifically but my example is a BOOL) from the plc to python to be used as a variable to display a picture. The issue is, if I use pycomm, I am getting an error in Windows Powershell. I feel this is a very simple error from a basic python mistake rather than a pycomm issue but I am not informed enough to tell.
SysInfo:
configparser==3.5.0
cpppo==3.9.7
greenery==2.1
ipaddress==1.0.18
pycomm==1.0.8
pyreadline==2.1
pytz==2017.2
python==2.7.13
Code I am using:
from pycomm.ab_comm.clx import Driver as ClxDriver
import logging
if __name__ == '__main__':
c = ClxDriver()
if c.open('IPADDRESSHERE'):
print(c.read_tag(['new_Bool']))
c.close()
Which is just a stripped down version of one of the examples on github https://github.com/ruscito/pycomm
This is the result from running powershell:
PS C:\Users\Tom\Documents\PythonProjects> python pycomm2.py
Traceback (most recent call last):
File "pycomm2.py", line 10, in
print(c.read_tag(['new_Bool']))
File "C:\Python27\lib\site-packages\pycomm\ab_comm\clx.py", line 359, in read_tag
self.logger.warning(self._status)
AttributeError: 'Driver' object has no attribute 'logger'
PS C:\Users\Tom\Documents\PythonProjects>
I have looked for this AttributeError and tried to find a solution, but I think the solutions I have found are over my head. If I have failed to provide some details in order for this question to make sense please let me know.
Edit:
from pycomm.ab_comm.clx import Driver as ClxDriver
import logging
if __name__ == '__main__':
logging.basicConfig(
filename="ClxDriver.log",
format="%(levelname)-10s %(asctime)s %(message)s",
level=logging.DEBUG
)
c = ClxDriver()
if c.open('IPADRESSHERE'):
print(c.read_tag(['new_Bool']))
c.close()
Yields the same attribute error.
PS C:\Users\Tom\Documents\PythonProjects> python pycommtest.py
Traceback (most recent call last):
File "pycommtest.py", line 15, in
print(c.read_tag(['new_Bool']))
File "C:\Python27\lib\site-packages\pycomm\ab_comm\clx.py", line 359, in read_tag
self.logger.warning(self._status)
AttributeError: 'Driver' object has no attribute 'logger'
PS C:\Users\Tom\Documents\PythonProjects>
I was able to read a value, but not with pycomm. Using CPPPO, I was able to continuously update a variable as needed. This may not answer the question of what was wrong with my old code, but it is my work around in case someone from the future has to do the same thing. Credit to user Liverpool_chris and the abyss of Reddit.
https://www.reddit.com/r/PLC/comments/5x3y5z/python_cpppo_library_writing_to_tag_in_plc/
from cpppo.server.enip.get_attribute import proxy_simple
import time
host = "IPHERE"
while True:
x, = proxy_simple(host).read(( "CPID"))
print x
time.sleep(5)

Multithreading, can't run Process command

I am trying to the following code:
#!/usr/bin/python
import multiprocessing
def f(name):
print 'hello', name
if __name__ == '__main__':
p = multiprocessing.Process(target=f, args=('bob',))
p.start()
p.join()
The output I get is :
Traceback (most recent call last):
File "a.py", line 9, in <module>
p = multiprocessing.Process(target=f, args=('bob',))
AttributeError: 'module' object has no attribute 'Process'
You are trying to import multiprocessing from your local directory and not from the python library. The python interpreter first tries to import the module from the present directory. As you have got a file with the name multiprocessing.pyc in your directory, the interpreter is trying to import that. Hence you have got the error. Thus deleting multiprocessing.pyc will help resolve your problem.
Dont give the name of the file as "multiprocessing.py", give any other
thanks,
vybhav
The mistake was naming, my script as 'multiprocessing.py', once it was created. I made an another script with name 'a.py' and both of them were not working. After listing the directories, 'multiprocessing.pyc' was located. I deleted this file, and executed 'a.py' file which executed like gem!
thanks to #Bhargav Rao for highlighting
Don't give the name in the same directory as multiprocess.py, use different name instead.

Python: Run Script Under Same Window

I am trying to setup a program where when someone enters a command it will run that command which is a script in a sub folder called "lib".
Here is my code:
import os
while 1:
cmd = input(' >: ')
for file in os.listdir('lib'):
if file.endswith('.py'):
try:
os.system(str(cmd + '.py'))
except FileNotFoundError:
print('Command Not Found.')
I have a file: lib/new_user.py But when I try to run it I get this error:
Traceback (most recent call last):
File "C:/Users/Daniel/Desktop/Wasm/Exec.py", line 8, in <module>
exec(str(cmd + '.py'))
File "<string>", line 1, in <module>
NameError: name 'new_user' is not defined
Does anyone know a way around this? I would prefer if the script would be able to be executed under the same window so it doesn't open a completely new one up to run the code there. This may be a really Noob question but I have not been able to find anything on this.
Thanks,
Daniel Alexander
os.system(os.path.join('lib', cmd + '.py'))
You're invoking new_user.py but it is not in the current directory. You need to construct lib/new_user.py.
(I'm not sure what any of this has to do with windows.)
However, a better approach for executing Python code from Python is making them into modules and using import:
import importlib
cmd_module = importlib.import_module(cmd, 'lib')
cmd_module.execute()
(Assuming you have a function execute defined in lib/new_user.py)

Why does my code work from interactive shell, but not when run from a file?

I am trying to use the pprint module to check out some vars in Python, which I can happily do using the interactive shell and the code below:
import pprint
pp = pprint.PrettyPrinter()
stuff = ['cakes','bread','mead']
pp.pprint(stuff)
However, when I put the above into pprint.py and run it using python pprint.py I get the error:
$ python dev/pars/pprint.py
Traceback (most recent call last):
File "dev/pars/pprint.py", line 1, in ?
import pprint
File "/home/origina2/dev/pars/pprint.py", line 2, in ?
pp = pprint.PrettyPrinter()
AttributeError: 'module' object has no attribute 'PrettyPrinter'
What is different about the way modules are called when running Python code from a file compared to the interactive shell?
You named your program pprint.py, so at the line import pprint it tries to import itself. It succeeds, but your pprint.py doesn't contain anything called PrettyPrinter.
Change your code's name. [And, to be clear, delete any pprint.pyc or pprint.pyo files..]

Python 3.1 - Error while adding a library in Blender

For this problem (stackoverflow.com/questions/4086435/), I tried to make a Python 3 version of the library python-websocket (github.com/mtah/python-websocket/), here is my code: https://gist.github.com/663175.
Blender comes with his own Python 3.1 package, so I added my file directly in its «site-packages» folder. I get this error now:
Traceback (most recent call last):
File "websocket.py", line 6, in
AttributeError: 'module' object has no attribute 'WebSocket'
when running this code in Blender:
import sys, os, asyncore, websocket
def msg_handler(msg):
print(msg)
socket = websocket.WebSocket('ws://localhost:8080/', onmessage=msg_handler)
socket.onopen = lambda: socket.send('Hello world!')
try:
asyncore.loop()
except KeyboardInterrupt:
socket.close()
I found that a __init__.py is needed so I added but it didn't help…
What I am doing wrong here ? Thanks for your help.
It looks like you called your script websocket.py, so the import of websocket finds the script itself, instead of the installed module by that name. Rename the script to something else (and if it created a websocket.pyc file, delete that.)

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