Re: [Tutor] using dynamic import statements
On Mon, Jul 9, 2012 at 3:10 AM, Chris Hare ch...@labr.net wrote: Here is what I want to do: I have a bunch of modules to import. instead of duplicating a lot of code for each import, I want to do something like this: importList = [ sys, os, imp, stat, re, webbrowser, Image, StringIO, shutil, datetime ] for object in importList: try: if debug == ON: print Importing module %s % (object) exec( import + object) except ImportError as error: print %s %s requires the Python %s library. % ( appName, str(appVersion), object ) print An error occurred when attempting to load the library. The error was '%s'. % ( error ) exit() Everything appears to run okay, however, when the first piece of code that relies upon one of these imported modules is executed, I get an error: Traceback (most recent call last): File a.py, line 122, in module imp.load_module(object,fp,pathName,description) File ./Modules/functions.py, line 133, in module def special_match(strg, search=re.compile(r'[^a-zA-Z0-9\.\ \-\#\$\*\@\!\%\^\]').search): NameError: name 're' is not defined Is is possible to do what I am trying to do, or am I doing something wrong? Yes, it is possible, but you are doing something wrong. Don't use exec() for this, it's unnecessary. You can make this work with the exec function, but the function you really want is called __import__(). It's documented here: http://docs.python.org/library/functions.html#__import__ HTH, Hugo ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] using dynamic import statements
On 09/07/12 02:10, Chris Hare wrote: Here is what I want to do: I have a bunch of modules to import. instead of duplicating a lot of code for each import, I want to do something like this: ...lots of code stripped Why not the more usual: import sys, os, imp, stat,\ re, webbrowser, Image, \ StringIO, shutil, datetime And let the Python ImportError alert you to what failed? Or if you must print your own errors just use try: import ... except ImportError: # your code here I'm not sure what code you think you need to duplicate or why. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] using dynamic import statements
On Mon, Jul 9, 2012 at 6:40 AM, Chris Hare ch...@labr.net wrote: Here is what I want to do: I have a bunch of modules to import. instead of duplicating a lot of code for each import, I want to do something like this: importList = [ sys, os, imp, stat, re, webbrowser, Image, StringIO, shutil, datetime ] for object in importList: try: if debug == ON: print Importing module %s % (object) exec( import + object) except ImportError as error: print %s %s requires the Python %s library. % ( appName, str(appVersion), object ) print An error occurred when attempting to load the library. The error was '%s'. % ( error ) exit() Everything appears to run okay, however, when the first piece of code that relies upon one of these imported modules is executed, I get an error: Traceback (most recent call last): File a.py, line 122, in module imp.load_module(object,fp,pathName,description) File ./Modules/functions.py, line 133, in module def special_match(strg, search=re.compile(r'[^a-zA-Z0-9\.\ \-\#\$\*\@\!\%\^\]').search): NameError: name 're' is not defined Is is possible to do what I am trying to do, or am I doing something wrong? Thanks ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor Hi, How about using import imp http://docs.python.org/library/imp.html calling run time modules as per your need. thank you ankur. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] using dynamic import statements
Why does this bloody ML want me to respond to the last person instead of tutor@python.org? --- On Mon, Jul 9, 2012 at 9:47 AM, Alan Gauld alan.ga...@btinternet.com wrote: On 09/07/12 02:10, Chris Hare wrote: Here is what I want to do: I have a bunch of modules to import. instead of duplicating a lot of code for each import, I want to do something like this: ...lots of code stripped Why not the more usual: import sys, os, imp, stat,\ re, webbrowser, Image, \ StringIO, shutil, datetime [snip] Why not the more standard: import sys import os and so on? http://www.python.org/dev/peps/pep-0008/#imports -- Kwpolska http://kwpolska.tk stop html mail | always bottom-post www.asciiribbon.org | www.netmeister.org/news/learn2quote.html GPG KEY: 5EAAEA16 | Arch Linux x86_64, zsh, mutt, vim. # vim:set textwidth=70: ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] using dynamic import statements
On 09/07/12 10:19, Kwpolska wrote: Why does this bloody ML want me to respond to the last person instead of tutor@python.org? Because that's how it, along with many other mailing lists, works. If it helps, think of it as you receiving a mail from the sender and CCd to the list. Therefore hitting reply sends to the person who sent the mail and ReplyAll goes to everyone. Seems logical to me! :-) It allows me to choose to reply to the OP only or to the group, I use both depending on the nature of my reply. (About 80% of my replies go to the everyone.) But some prefer it differently... :-) Why not the more usual: import sys, os, imp, stat,\ re, webbrowser, Image, \ StringIO, shutil, datetime Why not the more standard: import sys import os and so on? http://www.python.org/dev/peps/pep-0008/#imports Indeed but the OP seemed to want to remove duplicate coding so I assumed that he included using multiple imports. Personally I'd probably code the above as: import sys, os, shutil, stat, datetime import re, StringIO import webbrowser, import Image, import imp Which groups things into roughly related categories - system, strings, other... OTOH I ignore large chunks of Pep 8 because I find its style harder to read than the one I'm used to. But then, I'm not contributing to the standard library etc... Style is largely a matter of taste. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] using dynamic import statements
Thanks all for the ideas. I wanted to have my own error messages printed for the user - something a little more meaningful than the standard error. Thanks for the advice - very helpful! On Jul 9, 2012, at 6:12 AM, Alan Gauld wrote: On 09/07/12 10:19, Kwpolska wrote: Why does this bloody ML want me to respond to the last person instead of tutor@python.org? Because that's how it, along with many other mailing lists, works. If it helps, think of it as you receiving a mail from the sender and CCd to the list. Therefore hitting reply sends to the person who sent the mail and ReplyAll goes to everyone. Seems logical to me! :-) It allows me to choose to reply to the OP only or to the group, I use both depending on the nature of my reply. (About 80% of my replies go to the everyone.) But some prefer it differently... :-) Why not the more usual: import sys, os, imp, stat,\ re, webbrowser, Image, \ StringIO, shutil, datetime Why not the more standard: import sys import os and so on? http://www.python.org/dev/peps/pep-0008/#imports Indeed but the OP seemed to want to remove duplicate coding so I assumed that he included using multiple imports. Personally I'd probably code the above as: import sys, os, shutil, stat, datetime import re, StringIO import webbrowser, import Image, import imp Which groups things into roughly related categories - system, strings, other... OTOH I ignore large chunks of Pep 8 because I find its style harder to read than the one I'm used to. But then, I'm not contributing to the standard library etc... Style is largely a matter of taste. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] using dynamic import statements
Might I recommend you use the logging module that is part of core Python rather than rolling your own if Debug. I found the logging module made growing my logging across multiple applications so easy! http://docs.python.org/library/logging.html On Mon, Jul 9, 2012 at 2:10 PM, Chris Hare ch...@labr.net wrote: Thanks all for the ideas. I wanted to have my own error messages printed for the user - something a little more meaningful than the standard error. Thanks for the advice - very helpful! On Jul 9, 2012, at 6:12 AM, Alan Gauld wrote: On 09/07/12 10:19, Kwpolska wrote: Why does this bloody ML want me to respond to the last person instead of tutor@python.org? Because that's how it, along with many other mailing lists, works. If it helps, think of it as you receiving a mail from the sender and CCd to the list. Therefore hitting reply sends to the person who sent the mail and ReplyAll goes to everyone. Seems logical to me! :-) It allows me to choose to reply to the OP only or to the group, I use both depending on the nature of my reply. (About 80% of my replies go to the everyone.) But some prefer it differently... :-) Why not the more usual: import sys, os, imp, stat,\ re, webbrowser, Image, \ StringIO, shutil, datetime Why not the more standard: import sys import os and so on? http://www.python.org/dev/peps/pep-0008/#imports Indeed but the OP seemed to want to remove duplicate coding so I assumed that he included using multiple imports. Personally I'd probably code the above as: import sys, os, shutil, stat, datetime import re, StringIO import webbrowser, import Image, import imp Which groups things into roughly related categories - system, strings, other... OTOH I ignore large chunks of Pep 8 because I find its style harder to read than the one I'm used to. But then, I'm not contributing to the standard library etc... Style is largely a matter of taste. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
