File py7zlib.py has 591 lines of code (exceeds 250 allowed). Consider refactoring.

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#!/usr/bin/python -u
#
# Python Bindings for LZMA
#
# Copyright (c) 2004-2010 by Joachim Bauch, mail@joachim-bauch.de

Function __init__ has a Cognitive Complexity of 45 (exceeds 5 allowed). Consider refactoring.

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    def __init__(self, file):
        self.numfiles = self._read64Bit(file)
        self.files = [{'emptystream': False} for x in xrange(self.numfiles)]
        numemptystreams = 0
        while True:

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Function __init__ has a Cognitive Complexity of 39 (exceeds 5 allowed). Consider refactoring.

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    def __init__(self, file, password=None):
        self._file = file
        self.password = password
        self.header = file.read(len(MAGIC_7Z))
        if self.header != MAGIC_7Z:

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Function __init__ has a Cognitive Complexity of 28 (exceeds 5 allowed). Consider refactoring.

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    def __init__(self, file, numfolders, folders):
        self.digests = []
        self.digestsdefined = []
        id = file.read(1)
        if id == PROPERTY_NUM_UNPACK_STREAM:

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Function __init__ has a Cognitive Complexity of 23 (exceeds 5 allowed). Consider refactoring.

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    def __init__(self, file):
        numcoders = self._read64Bit(file)
        self.coders = []
        self.digestdefined = False
        totalin = 0

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Function _read_from_decompressor has a Cognitive Complexity of 14 (exceeds 5 allowed). Consider refactoring.

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    def _read_from_decompressor(self, coder, decompressor, input, checkremaining=False):
        data = ''
        idx = 0
        cnt = 0
        self._file.seek(self._src_start)

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Function __init__ has 35 lines of code (exceeds 25 allowed). Consider refactoring.

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    def __init__(self, file, password=None):
        self._file = file
        self.password = password
        self.header = file.read(len(MAGIC_7Z))
        if self.header != MAGIC_7Z:

Function __init__ has a Cognitive Complexity of 10 (exceeds 5 allowed). Consider refactoring.

Open

    def __init__(self, file):
        id = file.read(1)
        if id != PROPERTY_FOLDER:
            raise FormatError, 'folder id expected but %s found' % repr(id)
        self.numfolders = self._read64Bit(file)

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Function __init__ has 7 arguments (exceeds 4 allowed). Consider refactoring.

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    def __init__(self, info, start, src_start, size, folder, archive, maxsize=None):

Function _read_7z_aes256_sha256 has a Cognitive Complexity of 8 (exceeds 5 allowed). Consider refactoring.

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    def _read_7z_aes256_sha256(self, coder, input):
        if not self._archive.password:
            raise NoPasswordGivenError()
        
        # TODO: this needs some sanity checks

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Avoid deeply nested control flow statements.

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                        if ch == '\0\0':
                            f['filename'] = unicode(name, 'utf-16')
                            break
                        name += ch

Function read has a Cognitive Complexity of 7 (exceeds 5 allowed). Consider refactoring.

Open

    def read(self):
        if not self._folder.coders:
            raise TypeError("file has no coder informations")
        
        data = None

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Function list has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.

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    def list(self, verbose=True):
        print 'total %d files in %sarchive' % (self.numfiles, (self.solid and 'solid ') or '')
        if not verbose:
            print '\n'.join(self.filenames)
            return

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Function _readBoolean has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.

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    def _readBoolean(self, file, count, checkall=0):
        if checkall:
            alldefined = file.read(1)
            if alldefined != '\x00':
                return [True] * count

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