3.34 calibre-debug runs the script code under Python 3

EbokJunkie · 11-19-2018, 10:10 PM

Have old Python 2.7 script written in year 2013. It used to run under calibre-debug for five years. However, update to 3.34 began to throw syntax errors in all print commands in this script. Enclosing print operands in parenthesis in accordance with Python 3 standard helped.
I have 32- and 64-bit Python 2.7 and 3.4 installed on Windows 10 machine.
Bare command "Python" invokes Python 3.4.
Still, my unmodified original script runs OK under Calibre 3.31.
Is it possible that 3.34 calibre-debug in my environment somehow runs scripts under Python 3?

kovidgoyal · 11-19-2018, 10:23 PM

No it doesn't run under python3, but it does require use

from __future__ import print_function

which means you need to use the function from of print() in your scripts. This is aprt of the ongoing effort to port calibre to python 3.

EbokJunkie · 11-20-2018, 07:43 PM

Thank you Kovid!

11-19-2018, 10:10 PM	#1
EbokJunkie Addict Posts: 230 Karma: 13495 Join Date: Feb 2009 Location: SoCal Device: Kindle 3, Kindle PW, Pocketbook 301+, Pocketbook Touch, Sony 950, 350	3.34 calibre-debug runs the script code under Python 3 Have old Python 2.7 script written in year 2013. It used to run under calibre-debug for five years. However, update to 3.34 began to throw syntax errors in all print commands in this script. Enclosing print operands in parenthesis in accordance with Python 3 standard helped. I have 32- and 64-bit Python 2.7 and 3.4 installed on Windows 10 machine. Bare command "Python" invokes Python 3.4. Still, my unmodified original script runs OK under Calibre 3.31. Is it possible that 3.34 calibre-debug in my environment somehow runs scripts under Python 3?

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11-19-2018, 10:23 PM	#2
kovidgoyal creator of calibre Posts: 45,604 Karma: 28548974 Join Date: Oct 2006 Location: Mumbai, India Device: Various	No it doesn't run under python3, but it does require use from __future__ import print_function which means you need to use the function from of print() in your scripts. This is aprt of the ongoing effort to port calibre to python 3.

11-20-2018, 07:43 PM	#3
EbokJunkie Addict Posts: 230 Karma: 13495 Join Date: Feb 2009 Location: SoCal Device: Kindle 3, Kindle PW, Pocketbook 301+, Pocketbook Touch, Sony 950, 350	Thank you Kovid!

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