help on python replace function needed

philja · Today, 04:23 PM

Converting an epub2 to epub3, I found that another thing needing fixing was that the <title> in the <head> contained the book title rather than the Chapter title.

I made a regex Find which selected the first few lines :

Code:

(?is)(<title\b[^>]*>).*?(</title>)(.*?<h1\b[^>]*>(?:\s*<[^>]+>\s*)*([^<].+?)\s*</a></h1>)

where: 
\1 = <title>
\2 = </title>
\3 = everything after </title> up to and including </h1>
\4 = the chapter title

This worked fine because the chapter structure was consistent throughout the book. But then it occurred to me that it might be an opportunity to try a python function replace. I'm not a code writer let alone a python coder. So I took inspiration from the examples included in Sigil although I couldn't get the capitalize example function to work (lowercase, titlecase and uppercase were ok). I arrived at the following:

Code:

def replace(match, number, file_name, metadata, dictionaries, data, functions, *args, **kwargs):
    title_open = match[1]
    title_close = match[2]
    between = match[3]
    chapter_title = match[4].strip()

    return title_open + chapter_title + title_close + between

This did not work, which was not really a surprise to me, but it intrigues me not to understand why.

The full regex Find/Replace works fine, but I'm sure it would be helpful to understand more about python function replace. I don't find anything in the latest downloadable user guide and what is in the online version doesn't help me, sadly.

Where did I go wrong, and any recommendations for a useful, simple and easy text on the subject?

BeckyEbook · Today, 04:56 PM

Try this:

Code:

def replace(match, number, file_name, metadata, data):
	if match:
		title_open = match.group(1)
		title_close = match.group(2)
		between = match.group(3)
		chapter_title = match.group(4).strip()

		return title_open + chapter_title + title_close + between

Perhaps the problem is also that you put \s* before the closing </a></h1>, which forces a space to appear before the anchor closes.

To debug functions, it's a good idea to enable the SIGIL_FUNCTION_REPLACE_LOGFILE environment variable; that way, you'll see the errors in the log file.

Today, 04:23 PM	#1
philja Evangelist Posts: 423 Karma: 100100 Join Date: Nov 2015 Location: Europe EEC Device: Kindle Fire HD6 & HD8	help on python replace function needed Converting an epub2 to epub3, I found that another thing needing fixing was that the <title> in the <head> contained the book title rather than the Chapter title. I made a regex Find which selected the first few lines : Code: (?is)(<title\b[^>]>).?(</title>)(.?<h1\b[^>]>(?:\s<[^>]+>\s)([^<].+?)\s</a></h1>) where: \1 = <title> \2 = </title> \3 = everything after </title> up to and including </h1> \4 = the chapter title This worked fine because the chapter structure was consistent throughout the book. But then it occurred to me that it might be an opportunity to try a python function replace. I'm not a code writer let alone a python coder. So I took inspiration from the examples included in Sigil although I couldn't get the capitalize example function to work (lowercase, titlecase and uppercase were ok). I arrived at the following: Code: def replace(match, number, file_name, metadata, dictionaries, data, functions, args, *kwargs): title_open = match[1] title_close = match[2] between = match[3] chapter_title = match[4].strip() return title_open + chapter_title + title_close + between This did not work, which was not really a surprise to me, but it intrigues me not to understand why. The full regex Find/Replace works fine, but I'm sure it would be helpful to understand more about python function replace. I don't find anything in the latest downloadable user guide and what is in the online version doesn't help me, sadly. Where did I go wrong, and any recommendations for a useful, simple and easy text on the subject?

Today, 04:56 PM	#2
BeckyEbook Wizard Posts: 1,029 Karma: 3761621 Join Date: Jan 2017 Location: Poland Device: Various	Try this: Code: def replace(match, number, file_name, metadata, data): if match: title_open = match.group(1) title_close = match.group(2) between = match.group(3) chapter_title = match.group(4).strip() return title_open + chapter_title + title_close + between Perhaps the problem is also that you put \s* before the closing </a></h1>, which forces a space to appear before the anchor closes. To debug functions, it's a good idea to enable the SIGIL_FUNCTION_REPLACE_LOGFILE environment variable; that way, you'll see the errors in the log file. Attached Thumbnails

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