Extract 7z to bytes in memory using libarchive. In your case, you might be pulling it from a cloud storage and don't wan't to write in your secondary memory.

extract_7z_to_bytes.py

import libarchive.public #Not Secure?

# Reading the archived 7z file as bytes
with open('csvarchive.7z','rb') as f:
    archive_bytes = f.read()

# The function that you might want to use
def archive_bytes_to_file_bytes(archive_bytes):
    global entry_var
    with libarchive.public.memory_reader(archive_bytes) as reader:
        for entry in reader:
            entry_var = entry
            entry_bytes = b'' # Do you have a better way ?
            for block in entry.get_blocks():
                entry_bytes += block
            yield entry_bytes

# If the files are text, this will print them
for file_bytes in archive_bytes_to_file_bytes(archive_bytes):
    print(file_bytes)