Is it more CPU-efficient to read/write config file or read/write sqlite database?
I have a number of python processes which communicate with each other through writing/reading config text files. The python ConfigParser is used. I am wondering if it is more CPU-efficient to switch to using sqlite database instead of using configuration files. If the software does plenty of reading/writing, is it more efficient to use config text files or sqlite database? Thank you. -- https://mail.python.org/mailman/listinfo/python-list
Is it possible to mix python with php?
Python is my favorite language. Very often, I am forced to use other languages like php because of better library support for web applications. Is it possible to write functions in python and then get php to call these functions? Thank you -- https://mail.python.org/mailman/listinfo/python-list
Is there any advantage to using a main() in python scripts?
Python scripts can run without a main(). What is the advantage to using a main()? Is it necessary to use a main() when the script uses command line arguments? (See script below) #!/usr/bin/python import sys def main(): # print command line arguments for arg in sys.argv[1:]: print arg if __name__ == __main__: main() -- https://mail.python.org/mailman/listinfo/python-list
How to catch error messages in ftplib?
I have the following code;
try:
session = FTP(ftp_server_ip,ftp_user,ftp_password)
file = open(filename,'rb') # file to send
session.storbinary('STOR ' + filename, file) # send the file
except Exception, errObj:
print Exception
print errObj
file.close() # close file and FTP
session.quit()
I deliberately placed an invalid ip address for the ftp_server_ip to see
whether error messages can be caught. However, no exception was thrown. Can
someone more experienced point to me what did I do wrong?
Thank you.
--
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Re: How to catch error messages in ftplib?
I repost the original code segment to make it more complete;
from ftplib import FTP
try:
session = FTP(ftp_server_ip,ftp_user,ftp_password)
file = open(filename,'rb') # file to send
session.storbinary('STOR ' + filename, file) # send the file
except Exception, errObj:
print Exception
print errObj
file.close() # close file and FTP
session.quit()
On Tuesday, November 19, 2013 6:18:07 PM UTC+8, JL wrote:
I have the following code;
try:
session = FTP(ftp_server_ip,ftp_user,ftp_password)
file = open(filename,'rb') # file to send
session.storbinary('STOR ' + filename, file) # send the file
except Exception, errObj:
print Exception
print errObj
file.close() # close file and FTP
session.quit()
I deliberately placed an invalid ip address for the ftp_server_ip to see
whether error messages can be caught. However, no exception was thrown. Can
someone more experienced point to me what did I do wrong?
Thank you.
--
https://mail.python.org/mailman/listinfo/python-list
Re: Implementing #define macros similar to C on python
Thanks! This is the answer which I am seeking. However, I am not able to get the following line to work. I am using python 2.7.5 debug_print = print Can we assign a function into a variable in this manner? On Friday, November 15, 2013 11:49:52 AM UTC+8, Chris Angelico wrote: On Fri, Nov 15, 2013 at 1:29 PM, JL lightai...@gmail.com wrote: One of my favorite tools in C/C++ language is the preprocessor macros. One example is switching certain print messages for debugging use only #ifdef DEBUG_ENABLE DEBUG_PRINT print #else DEBUG_PRINT Is it possible to implement something similar in python? Thank you. There are usually other ways to do things. For instance, you can define a function to either do something or do nothing: if debug_mode: debug_print = print else: debug_print = lambda: None debug_print(This won't be shown unless we're in debug mode!) But as Dave says, you could write a preprocessor if you need one. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Implementing #define macros similar to C on python
On Saturday, November 16, 2013 8:22:25 AM UTC+8, Mark Lawrence wrote: Yes but please don't top post. Actually print is a statement in Python 2 so your code should work if you use from __future__ import print_function at the top of your code. Would you also be kind enough to read and action this https://wiki.python.org/moin/GoogleGroupsPython to prevent the double line spacing shown above, thanks. Thank you for the tip. Will try that out. Hope I get the posting etiquette right this time. -- https://mail.python.org/mailman/listinfo/python-list
Implementing #define macros similar to C on python
One of my favorite tools in C/C++ language is the preprocessor macros. One example is switching certain print messages for debugging use only #ifdef DEBUG_ENABLE DEBUG_PRINT print #else DEBUG_PRINT Is it possible to implement something similar in python? Thank you. -- https://mail.python.org/mailman/listinfo/python-list
Re: Implementing a multivibrator function with python
I am actually running python on raspberry pi. The trigger event is a button-press. On Monday, November 11, 2013 6:56:03 PM UTC+8, Dave Angel wrote: On Mon, 11 Nov 2013 01:41:58 -0800 (PST), JL lightai...@gmail.com wrote: - If the event happens again before the 5secs expire, the high duration will be extended by another 5 secs. This works like a retriggerable multivibrator for those who are into electronics. More precisely a retriggerable monostable multivibrator. The question makes little sense unless you're running in an event driven environment, such as a gui. Name the environment and somebody can probably help. -- DaveA -- https://mail.python.org/mailman/listinfo/python-list
Implementing a multivibrator function with python
I am trying to implement a multivibrator function with python. This is how it works; - An trigger event happens - Upon receiving the event, a variable goes high for 5secs, then go low. - If the event happens again before the 5secs expire, the high duration will be extended by another 5 secs. This works like a retriggerable multivibrator for those who are into electronics. Is there some sample code for this problem or can someone point me to using the right library for this feature? Thank you very much. -- https://mail.python.org/mailman/listinfo/python-list
Multiple scripts versus single multi-threaded script
What is the difference between running multiple python scripts and a single multi-threaded script? May I know what are the pros and cons of each approach? Right now, my preference is to run multiple separate python scripts because it is simpler. -- https://mail.python.org/mailman/listinfo/python-list
Re: PyGame, window is not closing, tut not helping
If the game runs normally without IDLE, then, to run it from IDLE, add pygame.quit() at the end of the script: if __name__ == __main__: MainWindow = PyManMain() MainWindow.MainLoop() pygame.quit() ... and just before the sys.exit(): def MainLoop(self): This is the Main Loop of the Game while 1: for event in pygame.event.get(): if event.type == pygame.QUIT: pygame.quit() sys.exit() -- http://mail.python.org/mailman/listinfo/python-list
pickle and __slots__
Hello, I am trying to pickle an object, and I get: TypeError: a class that defines __slots__ without defining __getstate__ cannot be pickled I didn't find __slots__ in the object or the class. Is there a way to find it, or to to know which object or class causes the problem? Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: pickle and __slots__
Is this a subclass? Look at the parent classes. Its class is a subclass of a similar class, but it indirectly references instances of subclasses of asyncore.dispatcher or asynchat.async_chat. I don't think there are other particular classes. If I remove the first references, pickle works. Anyway it seems that I will have to mask the asyncore.dispatcher and asynchat.async_chat subclass instances which will not be relevant at unpickle time. -- http://mail.python.org/mailman/listinfo/python-list
Re: pickle and __slots__
I added the following method to the 2 subclasses of asyncore.dispatcher and asynchat.async_chat and now pickle works: def __getstate__(self): return Later I will probably modify this method so it returns something more interesting. Thanks for your help! I was confused because I am not sure what can be pickled or not. -- http://mail.python.org/mailman/listinfo/python-list
