Plugin Developer Question

KevinH · 10-23-2010, 09:15 AM

Hi Kovid,

I have one piece of code that for support purposes, plays 3 roles. First it can be run standalone as a command line tool, second it can be imported into other python code (for code reuse) and last it can be a plugin for calibre.

I can use __name__ = '__main__' for detecting it as a standalone, but I need to a way to determine if imported from some other python code versus imported by the calibre python code.

So is there some string in __name__ that will definitely tell me I am being imported as a plugin from calibre code that won't change with where calibre is installed or from version to version of calibre (because keeping up with your release schedule would kill any normal human being).

Thanks,

KevinH

KevinH · 10-23-2010, 09:31 AM

Hi,

Please ignore my question above. I ran some tests and __name__ does not in any way show the path through which the module is imported so I can't use it for what I want.

I will try and find something else on the python developer website that might tell me something. I guess I could always try and import something from the calibre plugin namespace in a try catch block and see if it succeeds or not.

Thanks,

Kevin

kovidgoyal · 10-23-2010, 12:58 PM

Code:

try:
   import calibre
   in_calibre = True
except ImportError:
   in_calibre = False

DiapDealer · 10-23-2010, 08:17 PM

I found that:

Code:

if 'calibre' in sys.modules:
   inCalibre = True
else:
   inCalibre = False

works rather nicely.

10-23-2010, 09:15 AM	#1
KevinH Sigil Developer Posts: 7,637 Karma: 5433388 Join Date: Nov 2009 Device: many	Plugin Developer Question Hi Kovid, I have one piece of code that for support purposes, plays 3 roles. First it can be run standalone as a command line tool, second it can be imported into other python code (for code reuse) and last it can be a plugin for calibre. I can use __name__ = '__main__' for detecting it as a standalone, but I need to a way to determine if imported from some other python code versus imported by the calibre python code. So is there some string in __name__ that will definitely tell me I am being imported as a plugin from calibre code that won't change with where calibre is installed or from version to version of calibre (because keeping up with your release schedule would kill any normal human being). Thanks, KevinH

10-23-2010, 12:58 PM	#3
kovidgoyal creator of calibre Posts: 43,844 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Code: try: import calibre in_calibre = True except ImportError: in_calibre = False

10-23-2010, 08:17 PM	#4
DiapDealer Grand Sorcerer Posts: 27,547 Karma: 193191846 Join Date: Jan 2010 Device: Nexus 7, Kindle Fire HD	I found that: Code: if 'calibre' in sys.modules: inCalibre = True else: inCalibre = False works rather nicely.

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10-23-2010, 09:31 AM	#2
KevinH Sigil Developer Posts: 7,637 Karma: 5433388 Join Date: Nov 2009 Device: many	Hi, Please ignore my question above. I ran some tests and __name__ does not in any way show the path through which the module is imported so I can't use it for what I want. I will try and find something else on the python developer website that might tell me something. I guess I could always try and import something from the calibre plugin namespace in a try catch block and see if it succeeds or not. Thanks, Kevin

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