Enable Python3 module lzma (xz)

Development Feature Requests
1

Unlike LE, CE does seem to package Python3 binaries. However, the stdlib module lzma is not built/installed. As you may know this module would be a tremendous help in writing a Rytec EPG download tool. So could I ask to enable this module for the Python3 package? Thanks.

2

You can install the python3-lzma that comes with entware with:
opkg install python3-lzma

3

Here is the patch to compile python3 with lzma support:

diff --git a/packages/lang/Python3/package.mk b/packages/lang/Python3/package.mk
index 9796c5c..c91c23e 100644
--- a/packages/lang/Python3/package.mk
+++ b/packages/lang/Python3/package.mk
@@ -10,8 +10,8 @@ PKG_LICENSE="OSS"
 PKG_SITE="http://www.python.org/"
 PKG_URL="http://www.python.org/ftp/python/$PKG_VERSION/${PKG_NAME::-1}-$PKG_VERSION.tar.xz"
 PKG_SOURCE_DIR="${PKG_NAME::-1}-$PKG_VERSION*"
-PKG_DEPENDS_HOST="zlib:host bzip2:host libffi:host util-linux:host"
-PKG_DEPENDS_TARGET="toolchain sqlite expat zlib bzip2 openssl Python3:host readline ncurses"
+PKG_DEPENDS_HOST="zlib:host bzip2:host xz:host libffi:host util-linux:host"
+PKG_DEPENDS_TARGET="toolchain sqlite expat zlib bzip2 xz openssl Python3:host readline ncurses"
 PKG_SECTION="lang"
 PKG_SHORTDESC="python3: The Python3 programming language"
 PKG_LONGDESC="Python3 is an interpreted object-oriented programming language, and is often compared with Tcl, Perl, Java or Scheme."
@@ -69,7 +69,7 @@ PKG_CONFIGURE_OPTS_TARGET="ac_cv_prog_HAS_HG=/bin/false
                            --enable-readline
                            --enable-bzip2
                            --enable-zlib
-                           --disable-xz
+                           --enable-xz
                            --disable-tk
                            --enable-curses
                            --disable-pydoc

I tested this python sample:

import lzma
with lzma.open('test.tar.xz') as f:
    file_content = f.read()

with python3 + python3-lzma from entware and a coreelec build with the above patch and worked on both cases.

4

First of all, thanks for the pointer to entware. With the patch you posted, is entware even necessary to get Python3 with lzma?

5

No. If you can compile your own build go ahead, but with the entware route you’ll have it running after less than a minute.

6

Of course. I misunderstood the statement «python3 + python3-lzma from entware and a coreelec build with the above patch» (my emphasis)