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From: Szyk Cech <szykcech@spoko.pl>
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Xref: csiph.com pl.comp.lang.python:141

Witam
Podam pełną wersję mojej funkcji do osadzania całego obrazka w kodzie 
html. Skrypt wykrywa normalny odnośnik do obrazka i go wymienia na ciało 
kodowane w Base64. Oto kod:

def gEmbedImages(aPage):
    lResult = aPage
    lRe = 
re.compile(r"""<img\s+src\s*=\s*\"(.+?)"\s+alt\s*=\s*"(.+?)"/>""", 
re.IGNORECASE)
    lMatch = lRe.search(aPage)
    while lMatch:
       if not os.path.isfile(lMatch.group(1)):
          raise Exception("File not found! File: 
{0}".format(lMatch.group(1)))
       f = open(lMatch.group(1), 'rb')
       #lBase64 = """<img alt="{1}" 
src=”data:image/png;base64,{0}"/>""".format(base64.b64encode(f.read()).decode('ascii').replace('\n', 
''), lMatch.group(2))
       lBase64 = """<img alt="%s" src="data:image/png;base64,%s"/>""" % 
(lMatch.group(2), 
base64.b64encode(f.read()).decode('ascii').replace('\n', ''))
       lResult = lResult.replace(lMatch.group(0), lBase64)
       lMatch = lRe.search(aPage, lMatch.end())
    return lResult

Moje pytanie jest takie:
Dlaczego linia:
       #lBase64 = """<img alt="{1}" 
src=”data:image/png;base64,{0}"/>""".format(base64.b64encode(f.read()).decode('ascii').replace('\n', 
''), lMatch.group(2))

nie działa (błędnie koduje)?
A linia:

       lBase64 = """<img alt="%s" src="data:image/png;base64,%s"/>""" % 
(lMatch.group(2), 
base64.b64encode(f.read()).decode('ascii').replace('\n', ''))

działa bez zarzutu?!?

dzięki i pozdro
Szyk Cech