import io
from lib7zip import Archive, formats
#view information on supported formats
for format in formats:
    print(format.name, ', '.join(format.extensions))

#type of archive will be autodetected
#pass in optional forceformat argument to force the use a particular format (use the name)
#pass in optional password argument to open encrypted archives.
with Archive('path_to.7z') as archive:
    #extract all items to the directory, directory will be created if it doesn't exist
    archive.extract('extract_here')

    #list all items in the archive and get their metadata
    for item in archive:
        print( item.isdir, item.path, item.crc)

    #extract a particular archive item
    # like extract, accepts a password argument, useful if different
    # items in the archive have different passwords
    archive[0].extract('extract to here.txt')

    #extract a particular archive item to a python stream object
    stream = io.BytesIO()
    archive[0].extract(stream)
    stream.getvalue()  # a bytes object containing the contents of item 0