how to extract members of tar.gz file within a zip file in Python

Question

zip file contains tar.gz file. How do I retrieve the members of the tar.gz file without extract to disk first?

abc.zip
  |- def.txt
  |- ghi.zip 
  |- jkl.tar.gz


def scan_zip_file(zfile):
    l_files = []
    with zipfile.ZipFile(zfile, 'r') as zf:
        for zname in zf.namelist(): 
            if zname.endswith('.zip'):
                with zipfile.ZipFile(io.BytesIO(zf.read(zname))) as zf2:
                   l_files.extend(zf2.namelist())
            elif zname.endswith('.tar.gz'):
                pass
            else:
                l_files.append(zname)

Answer 1

You can use the tarfile module, in a very similar way you used the zipfile module. To complete your code and get the names of files in the tar.gz file:

def scan_zip_file(zfile):
    l_files = []
    with zipfile.ZipFile(zfile, 'r') as zf:
        for zname in zf.namelist(): 
            if zname.endswith('.zip'):
                with zipfile.ZipFile(io.BytesIO(zf.read(zname))) as zf2:
                   l_files.extend(zf2.namelist())
            elif zname.endswith('.tar.gz'):
                with tarfile.open(fileobj=io.BytesIO(zf.read(zname))) as tf:
                   l_files.extend(tf.getnames())
            else:
                l_files.append(zname)

The fileobj argument for tarfile.open tells it to use a 'File-like object' which io.BytesIO returns.