parseinfo.py (py3 + lxml)

#! /usr/bin/env python3
# Parses info about the current epub
import zipfile as ZIP
import sys
import os
try:
    from lxml import etree as ET
except:
    print("ERROR: lxml library must be installed.")
    sys.exit(1)

namespaces = {"opf":"http://www.idpf.org/2007/opf","dc":"http://purl.org/dc/elements/1.1/"}

def parseInfo(file):
    info = {}
    try:
        f = ZIP.ZipFile(file).read("META-INF/container.xml")
    except KeyError:
        print( "The %s file is not a valid OCF." % str(file) )
    try:
        f = ET.fromstring(f)
        info["path_to_opf"] = f[0][0].get("full-path")
        root_folder = os.path.dirname(info["path_to_opf"])
    except:
        pass
    opf = ET.fromstring(ZIP.ZipFile(file).read(info["path_to_opf"]))

    id = opf.xpath("//opf:spine",namespaces=namespaces)[0].get("toc")
    expr = "//*[@id='%s']" % id
    info["ncx_name"] = opf.xpath(expr)[0].get("href")
    info["path_to_ncx"] = root_folder + "/" + info["ncx_name"]
    info.pop("ncx_name")

    return info

def parseOPF(file):
    meta = {}
    opf = ET.fromstring(ZIP.ZipFile(file).read(parseInfo(file)["path_to_opf"]))

    return opf

def parseNCX(file):

    ncx = {}
    ncx = ET.fromstring(ZIP.ZipFile(file).read(parseInfo(file)["path_to_ncx"]))

    return ncx

def showMeta(list, attrib=""):
    for i in list:
        print( attrib,"\t", i.text )

class Metadata:
    def __init__(self, file):
        opf = parseOPF(file)

        self.title = opf.xpath("//dc:title",namespaces=namespaces)
        self.author = opf.xpath("//dc:creator",namespaces=namespaces)
        self.isbn = opf.xpath("//dc:identifier",namespaces=namespaces)
        self.language = opf.xpath("//dc:language",namespaces=namespaces)
        self.publisher = opf.xpath("//dc:publisher",namespaces=namespaces)
        self.pubdate = opf.xpath("//dc:date[@opf:event='publication']",namespaces=namespaces)


if __name__ == "__main__":
    for file in sys.argv[1:]:
        try:
            m = Metadata(file)
        except:
            print("Invalid file: ",file)
            continue

        print( "File: ","\t",file)
        showMeta(m.title, "Title")
        showMeta(m.author, "Author")
        showMeta(m.language, "Language")
        showMeta(m.publisher, "Publisher")
        showMeta(m.isbn,"ISBN")
        showMeta(m.pubdate,"PubDate")
        print( "")