Tag: python

List all Gentoo packages built against the old python or specific version

Updating python under Gentoo is not always straightforward work. Despite a clean upgrade without any blockers or masked packages, sometimes, on old machines, there might be packages left still built against an old version of python, which is no longer available on the system!

main menu
Query for USE with python_targets_python3_4, python_targets_python3_5 and python_targets_python3_6.

On Gentoo, there are two important flags in the configuration make.conf file:

PYTHON_TARGETS="python3_8 python3_10"
PYTHON_SINGLE_TARGET="python3_8"

The PYTHON_TARGETS and PYTHON_SINGLE_TARGET control the support of multiple Python versions installed on the system. When the Gentoo package has a use flag python, the builder emerge will build the python module for all the Python versions in PYTHON_TARGETS. Some programs or libraries may not support multiple versions to be installed on the system and they may require to specify just one Python library target, against which they are going to be built and that’s why PYTHON_SINGLE_TARGET exists. In most cases, the PYTHON_SINGLE_TARGET should be the active (default in the system) Python version.
Keep on reading!

Building python 3.10.4 and possibly undefined macro: AC_MSG_ERROR

Emerging the new python 3.10 in Gentoo may lead to the following error, despite all the dependencies installed. This error might also occur in any other Linux distro! During the configure stage the autoconf tool outputs error:

root@srv ~ # cat /var/tmp/portage/dev-lang/python-3.10.5/temp/autoconf.out 
***** autoconf *****
***** PWD: /var/tmp/portage/dev-lang/python-3.10.5/work/Python-3.10.5
***** autoconf --force

configure.ac:59: warning: The macro `AC_CONFIG_HEADER' is obsolete.
configure.ac:59: You should run autoupdate.
./lib/autoconf/status.m4:719: AC_CONFIG_HEADER is expanded from...
configure.ac:59: the top level
configure.ac:911: warning: AC_LINK_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
./lib/autoconf/specific.m4:364: AC_USE_SYSTEM_EXTENSIONS is expanded from...
configure.ac:911: the top level
configure.ac:2214: warning: The macro `AC_HEADER_STDC' is obsolete.
configure.ac:2214: You should run autoupdate.
./lib/autoconf/headers.m4:704: AC_HEADER_STDC is expanded from...
configure.ac:2214: the top level
configure.ac:4250: warning: The macro `AC_HEADER_TIME' is obsolete.
configure.ac:4250: You should run autoupdate.
./lib/autoconf/headers.m4:743: AC_HEADER_TIME is expanded from...
configure.ac:4250: the top level
configure.ac:18: error: possibly undefined macro: AC_MSG_ERROR
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation

It appears a dependency is missing! First, build the package sys-devel/autoconf-archive and then the building of python-3.10.5 will finish successfully.

root@srv ~ # emerge -va autoconf-archive

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild  N     ] sys-devel/autoconf-archive-2022.02.11::gentoo  660 KiB

Total: 1 package (1 new), Size of downloads: 660 KiB

Would you like to merge these packages? [Yes/No] yes

Emerging the dev-lang/python-3.10.5::gentoo outputs the error and the building process stops. The error output in emerge command is so informative. The actual error is in the /var/tmp/portage/dev-lang/python-3.10.5/temp/autoconf.out.
Keep on reading!

Install newer version of python 3.10 under CentOS 8

At present, the default version of python under CentOS 8 is Python 3.6.8, which is 6 years old. More and more python software needs newer versions, so it is a vital for pretty stable Linux distro to have an easy way to install newer programming languages like python!
Using Conda it is really easy to manage different environments for different python versions!

Conda is an open source package management system and environment management system that runs on Windows, macOS and Linux.

More on Conda – Installing conda command line in various systems with miniconda and create a simple python environment and all Conda tags – https://ahelpme.com/category/software/anaconda/. This article is not intended to introduce the reader with Conda, but to show how easy is to install the newer version of python 3.10 under CentOS 8 and it is easy because of using the Conda package management system!

To summarize, the purpose is to have a user with python 3.10. The user can be an ordinary or administrative one or even root.
Using this method older or newer versions of python may be installed on the same machine (at the same time).

STEP 1) Install the latest Miniconda3

The installation is easy and for more details check out the first link above.
Keep on reading!

Installing conda command line in various systems with miniconda and create a simple python environment

Conda is yet another package, dependency and environment management for multiple languages like Python, C/C++, JavaScript, Java, Scala and many more
For example, with Conda the user could create python environment with the exact versions he needs! And it could be used under any Linux distribution or even Windows.

This article is to show how to install the command-line version of the Conda, which is part of the bigger platform Anaconda. The command-line version is distributed with the name Miniconda. In fact, Miniconda is a free installer for Conda, which includes only the basic set to run conda and conda install to install more than 8000 packages from the Anaconda repositories.

The Anaconda repositories could be found here: https://anaconda.org/anaconda/repo

Advantages of Miniconda:

  1. Minimal installation. 400 Mbytes, not 3G for the Anaconda platform.
  2. simple command-line interface. Couple of simple commands and their instructions are enough to bring up a complex environment for scientific or development purposes.
  3. The creating of a specific environment could be automated.
  4. No strange or not friendly GUI.
  5. Easy installation under most of the Linux distribution and Windows.
  6. The whole installation could occur only under a user’s home directory. No files require to be installed by the administrator or under global administrative path.

Keep on reading!

Gentoo ERROR: Python module pytevent of version 0.10.2 not found, and bundling disabled

Emerging the sys-libs/ldb-2.3.0-r1 package may fail with an error for a missing Python mode, despite the sys-libs/tevent with a python USE flag is presented in the system:

Checking for system tevent (>=0.10.2)                                                           : yes 
ERROR: Python module pytevent of version 0.10.2 not found, and bundling disabled
 * ERROR: sys-libs/ldb-2.3.0-r1::gentoo failed (configure phase):
 *   configure failed
 * 
 * Call stack:

Indeed, the tevent (>=0.10.2) is found, but not the Python module! And the checking pase of the setup fails.
First, check whether the USE of sys-libs/tevent has python and the right version PYTHON_SINGLE_TARGET=”python3_8″ is used (the Python version may vary here):

root@srv # emerge -pv =tevent-0.10.2::gentoo

[ebuild   R    ] sys-libs/tevent-0.10.2::gentoo  USE="python" ABI_X86="32 (64) (-x32)" PYTHON_SINGLE_TARGET="python3_8 -python3_9" 0 KiB

Total: 1 package (1 reinstall), Size of downloads: 0 KiB

This system uses Python 3.8 and the library sys-libs/tevent was built with this USE flag.

The problem here is the tevent is installed under a its own directory: /usr/lib64/tevent. Using the ldconig utility the problem quickly has been resolved. Just add a file /etc/ld.so.conf.d/tevent_ldb.conf with the path to the library and then regenerate the ldconfig:

root@srv # cat /etc/ld.so.conf.d/tevent_ldb.conf
/usr/lib64/tevent
root@srv # ldconfig
root@srv #

Do not forget to run the “ldconfig“, because tevent library won’t be added to the LD cache. Emerging the sys-libs/ldb and then samba was successful after this quick workaround! There is a Gentoo bug reported, but the problem still exists – https://bugs.gentoo.org/590026

Easy install the latest docker-compose with pip3 under Ubuntu

At present, the latest docker-compose version, which could be installed under Ubuntu 18, 20, and 21 is the 1.25 and 1.27 versions. There may be significant changes included in the latest versions and if one wants to install it there are two options:

For example, depends_on.service.condition: service_healthy is added with version 1.28. Using this new feature it is fairly easy to implement waiting for a docker container (service) before starting another docker.

Here is how easy it is to install and to have the latest stable docker-compose version, which is 1.29.2 at the writing of this article:

STEP 1) Update and upgrade.

Do this step always before installing new software.

sudo apt update
sudo apt upgrade -y

STEP 2) Install pip3 and docker.

pip 3 is the package installer for Python 3. When using docker-compose it is supposed to have the very Docker software, too.

apt install python3-pip docker
systemctl start docker

STEP 3) Install docker-compose using pip3.

pip3 install docker-compose

And here is what a version command prints:

root@srv:~# docker-compose version
docker-compose version 1.29.2, build unknown
docker-py version: 5.0.2
CPython version: 3.8.10
OpenSSL version: OpenSSL 1.1.1f  31 Mar 2020

Just to note, installing packages using other programs other than apt may lead to future conflicts!

The whole console output of the pip3 installing docker-compose

root@srv:~# apt update
Get:1 http://archive.ubuntu.com/ubuntu focal InRelease [265 kB]
Get:2 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]              
Get:3 http://archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]
Get:4 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Get:5 http://archive.ubuntu.com/ubuntu focal/multiverse amd64 Packages [177 kB]
Get:6 http://archive.ubuntu.com/ubuntu focal/restricted amd64 Packages [33.4 kB]
Get:7 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages [11.3 MB]
Get:8 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages [1275 kB]                  
Get:9 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [1514 kB]        
Get:10 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 Packages [33.3 kB]
Get:11 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [1069 kB]
Get:12 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages [575 kB]
Get:13 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 Packages [6324 B]
Get:14 http://archive.ubuntu.com/ubuntu focal-backports/main amd64 Packages [2668 B]
Get:15 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [1070 kB]
Get:16 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages [790 kB]
Get:17 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 Packages [30.1 kB]
Get:18 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 Packages [525 kB]
Fetched 19.0 MB in 1s (16.7 MB/s)                          
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.
root@srv:~# apt upgrade -y
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@srv:~# apt install -y python3-pip docker
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  binutils binutils-common binutils-x86-64-linux-gnu build-essential ca-certificates cpp cpp-9 dirmngr dpkg-dev fakeroot file g++ g++-9 gcc gcc-9 gcc-9-base gnupg gnupg-l10n gnupg-utils
  gpg gpg-agent gpg-wks-client gpg-wks-server gpgconf gpgsm libalgorithm-diff-perl libalgorithm-diff-xs-perl libalgorithm-merge-perl libasan5 libasn1-8-heimdal libassuan0 libatomic1
  libbinutils libbsd0 libc-dev-bin libc6-dev libcc1-0 libcrypt-dev libctf-nobfd0 libctf0 libdpkg-perl libexpat1 libexpat1-dev libfakeroot libfile-fcntllock-perl libgcc-9-dev
  libgdbm-compat4 libgdbm6 libglib2.0-0 libglib2.0-data libgomp1 libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal libheimntlm0-heimdal libhx509-5-heimdal libicu66 libisl22
  libitm1 libkrb5-26-heimdal libksba8 libldap-2.4-2 libldap-common liblocale-gettext-perl liblsan0 libmagic-mgc libmagic1 libmpc3 libmpdec2 libmpfr6 libnpth0 libperl5.30 libpython3-dev
  libpython3-stdlib libpython3.8 libpython3.8-dev libpython3.8-minimal libpython3.8-stdlib libquadmath0 libreadline8 libroken18-heimdal libsasl2-2 libsasl2-modules libsasl2-modules-db
  libsqlite3-0 libssl1.1 libstdc++-9-dev libtsan0 libubsan1 libwind0-heimdal libx11-6 libx11-data libxau6 libxcb1 libxdmcp6 libxml2 linux-libc-dev make manpages manpages-dev mime-support
  netbase openssl patch perl perl-modules-5.30 pinentry-curses python-pip-whl python3 python3-dev python3-distutils python3-lib2to3 python3-minimal python3-pkg-resources
  python3-setuptools python3-wheel python3.8 python3.8-dev python3.8-minimal readline-common shared-mime-info tzdata wmdocker xdg-user-dirs xz-utils zlib1g-dev
Suggested packages:
  binutils-doc cpp-doc gcc-9-locales dbus-user-session libpam-systemd pinentry-gnome3 tor debian-keyring g++-multilib g++-9-multilib gcc-9-doc gcc-multilib autoconf automake libtool flex
  bison gdb gcc-doc gcc-9-multilib parcimonie xloadimage scdaemon glibc-doc git bzr gdbm-l10n libsasl2-modules-gssapi-mit | libsasl2-modules-gssapi-heimdal libsasl2-modules-ldap
  libsasl2-modules-otp libsasl2-modules-sql libstdc++-9-doc make-doc man-browser ed diffutils-doc perl-doc libterm-readline-gnu-perl | libterm-readline-perl-perl libb-debug-perl
  liblocale-codes-perl pinentry-doc python3-doc python3-tk python3-venv python-setuptools-doc python3.8-venv python3.8-doc binfmt-support readline-doc
The following NEW packages will be installed:
  binutils binutils-common binutils-x86-64-linux-gnu build-essential ca-certificates cpp cpp-9 dirmngr docker dpkg-dev fakeroot file g++ g++-9 gcc gcc-9 gcc-9-base gnupg gnupg-l10n
  gnupg-utils gpg gpg-agent gpg-wks-client gpg-wks-server gpgconf gpgsm libalgorithm-diff-perl libalgorithm-diff-xs-perl libalgorithm-merge-perl libasan5 libasn1-8-heimdal libassuan0
  libatomic1 libbinutils libbsd0 libc-dev-bin libc6-dev libcc1-0 libcrypt-dev libctf-nobfd0 libctf0 libdpkg-perl libexpat1 libexpat1-dev libfakeroot libfile-fcntllock-perl libgcc-9-dev
  libgdbm-compat4 libgdbm6 libglib2.0-0 libglib2.0-data libgomp1 libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal libheimntlm0-heimdal libhx509-5-heimdal libicu66 libisl22
  libitm1 libkrb5-26-heimdal libksba8 libldap-2.4-2 libldap-common liblocale-gettext-perl liblsan0 libmagic-mgc libmagic1 libmpc3 libmpdec2 libmpfr6 libnpth0 libperl5.30 libpython3-dev
  libpython3-stdlib libpython3.8 libpython3.8-dev libpython3.8-minimal libpython3.8-stdlib libquadmath0 libreadline8 libroken18-heimdal libsasl2-2 libsasl2-modules libsasl2-modules-db
  libsqlite3-0 libssl1.1 libstdc++-9-dev libtsan0 libubsan1 libwind0-heimdal libx11-6 libx11-data libxau6 libxcb1 libxdmcp6 libxml2 linux-libc-dev make manpages manpages-dev mime-support
  netbase openssl patch perl perl-modules-5.30 pinentry-curses python-pip-whl python3 python3-dev python3-distutils python3-lib2to3 python3-minimal python3-pip python3-pkg-resources
  python3-setuptools python3-wheel python3.8 python3.8-dev python3.8-minimal readline-common shared-mime-info tzdata wmdocker xdg-user-dirs xz-utils zlib1g-dev
.....
.....
0 upgraded, 128 newly installed, 0 to remove and 0 not upgraded.
Need to get 84.6 MB of archives.
After this operation, 370 MB of additional disk space will be used.
Processing triggers for ca-certificates (20210119~20.04.1) ...
Updating certificates in /etc/ssl/certs...
0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.
root@srv:~# pip3 install docker-compose
Collecting docker-compose
  Downloading docker_compose-1.29.2-py2.py3-none-any.whl (114 kB)
     |████████████████████████████████| 114 kB 12.4 MB/s 
Collecting requests<3,>=2.20.0
  Downloading requests-2.26.0-py2.py3-none-any.whl (62 kB)
     |████████████████████████████████| 62 kB 355 kB/s 
Collecting jsonschema<4,>=2.5.1
  Downloading jsonschema-3.2.0-py2.py3-none-any.whl (56 kB)
     |████████████████████████████████| 56 kB 3.4 MB/s 
Collecting websocket-client<1,>=0.32.0
  Downloading websocket_client-0.59.0-py2.py3-none-any.whl (67 kB)
     |████████████████████████████████| 67 kB 3.3 MB/s 
Collecting texttable<2,>=0.9.0
  Downloading texttable-1.6.4-py2.py3-none-any.whl (10 kB)
Collecting PyYAML<6,>=3.10
  Downloading PyYAML-5.4.1-cp38-cp38-manylinux1_x86_64.whl (662 kB)
     |████████████████████████████████| 662 kB 76.9 MB/s 
Collecting dockerpty<1,>=0.4.1
  Downloading dockerpty-0.4.1.tar.gz (13 kB)
Collecting docker[ssh]>=5
  Downloading docker-5.0.2-py2.py3-none-any.whl (145 kB)
     |████████████████████████████████| 145 kB 119.5 MB/s 
Collecting distro<2,>=1.5.0
  Downloading distro-1.6.0-py2.py3-none-any.whl (19 kB)
Collecting docopt<1,>=0.6.1
  Downloading docopt-0.6.2.tar.gz (25 kB)
Collecting python-dotenv<1,>=0.13.0
  Downloading python_dotenv-0.19.0-py2.py3-none-any.whl (17 kB)
Collecting urllib3<1.27,>=1.21.1
  Downloading urllib3-1.26.6-py2.py3-none-any.whl (138 kB)
     |████████████████████████████████| 138 kB 141.1 MB/s 
Collecting charset-normalizer~=2.0.0; python_version >= "3"
  Downloading charset_normalizer-2.0.4-py3-none-any.whl (36 kB)
Collecting certifi>=2017.4.17
  Downloading certifi-2021.5.30-py2.py3-none-any.whl (145 kB)
     |████████████████████████████████| 145 kB 133.3 MB/s 
Collecting idna<4,>=2.5; python_version >= "3"
  Downloading idna-3.2-py3-none-any.whl (59 kB)
     |████████████████████████████████| 59 kB 1.6 MB/s 
Collecting pyrsistent>=0.14.0
  Downloading pyrsistent-0.18.0-cp38-cp38-manylinux1_x86_64.whl (118 kB)
     |████████████████████████████████| 118 kB 131.3 MB/s 
Requirement already satisfied: setuptools in /usr/lib/python3/dist-packages (from jsonschema<4,>=2.5.1->docker-compose) (45.2.0)
Collecting six>=1.11.0
  Downloading six-1.16.0-py2.py3-none-any.whl (11 kB)
Collecting attrs>=17.4.0
  Downloading attrs-21.2.0-py2.py3-none-any.whl (53 kB)
     |████████████████████████████████| 53 kB 899 kB/s 
Collecting paramiko>=2.4.2; extra == "ssh"
  Downloading paramiko-2.7.2-py2.py3-none-any.whl (206 kB)
     |████████████████████████████████| 206 kB 147.7 MB/s 
Collecting cryptography>=2.5
  Downloading cryptography-3.4.8-cp36-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (3.2 MB)
     |████████████████████████████████| 3.2 MB 147.4 MB/s 
Collecting bcrypt>=3.1.3
  Downloading bcrypt-3.2.0-cp36-abi3-manylinux2010_x86_64.whl (63 kB)
     |████████████████████████████████| 63 kB 1.4 MB/s 
Collecting pynacl>=1.0.1
  Downloading PyNaCl-1.4.0-cp35-abi3-manylinux1_x86_64.whl (961 kB)
     |████████████████████████████████| 961 kB 139.4 MB/s 
Collecting cffi>=1.12
  Downloading cffi-1.14.6-cp38-cp38-manylinux1_x86_64.whl (411 kB)
     |████████████████████████████████| 411 kB 84.0 MB/s 
Collecting pycparser
  Downloading pycparser-2.20-py2.py3-none-any.whl (112 kB)
     |████████████████████████████████| 112 kB 140.9 MB/s 
Building wheels for collected packages: dockerpty, docopt
  Building wheel for dockerpty (setup.py) ... done
  Created wheel for dockerpty: filename=dockerpty-0.4.1-py3-none-any.whl size=16604 sha256=d6f2d3d74bad523b1a308a952176a1db84cb604611235c1a5ae1c936cefe7889
  Stored in directory: /root/.cache/pip/wheels/1a/58/0d/9916bf3c72e224e038beb88f669f68b61d2f274df498ff87c6
  Building wheel for docopt (setup.py) ... done
  Created wheel for docopt: filename=docopt-0.6.2-py2.py3-none-any.whl size=13704 sha256=f8c389703e63ff7ec3734b240ba8d62c8f8bd99f3b05ccdcb0de1397aa523655
  Stored in directory: /root/.cache/pip/wheels/56/ea/58/ead137b087d9e326852a851351d1debf4ada529b6ac0ec4e8c
Successfully built dockerpty docopt
Installing collected packages: urllib3, charset-normalizer, certifi, idna, requests, pyrsistent, six, attrs, jsonschema, websocket-client, texttable, PyYAML, dockerpty, pycparser, cffi, cryptography, bcrypt, pynacl, paramiko, docker, distro, docopt, python-dotenv, docker-compose
Successfully installed PyYAML-5.4.1 attrs-21.2.0 bcrypt-3.2.0 certifi-2021.5.30 cffi-1.14.6 charset-normalizer-2.0.4 cryptography-3.4.8 distro-1.6.0 docker-5.0.2 docker-compose-1.29.2 dockerpty-0.4.1 docopt-0.6.2 idna-3.2 jsonschema-3.2.0 paramiko-2.7.2 pycparser-2.20 pynacl-1.4.0 pyrsistent-0.18.0 python-dotenv-0.19.0 requests-2.26.0 six-1.16.0 texttable-1.6.4 urllib3-1.26.6 websocket-client-0.59.0

env python3.5: no such file or directory

The dependency conflicts may require a lot of time to resolve. On the contrary, uninstalling old software is easy, but it might lead to multiple broken programs and strange errors. Here is one of them, after removing the old python 3.4 and 3.5 (or whatever version it prints in your case) under Gentoo despite the rebuilding all dependencies as required by the emerge command for the new python 3.6 an error occurred trying to emerge the “app-misc/geoclue-2.5.3-r2”

[20/75] /usr/lib/python-exec/python3.6/meson --internal exe --unpickle /var/tmp/portage/app-misc/geoclue-2.5.3-r2/work/geoclue-2.5.3-build/meson-private/meson_exe_glib-mkenums_af4feac41c42ec7289410f8b20070c0528a3a7c0.dat
FAILED: public-api/gclue-enum-types.c 
/usr/lib/python-exec/python3.6/meson --internal exe --unpickle /var/tmp/portage/app-misc/geoclue-2.5.3-r2/work/geoclue-2.5.3-build/meson-private/meson_exe_glib-mkenums_af4feac41c42ec7289410f8b20070c0528a3a7c0.dat
/usr/bin/env: âpython3.5â: No such file or directory
ninja: build stopped: subcommand failed.
 * ERROR: app-misc/geoclue-2.5.3-r2::gentoo failed (compile phase):
 *   ninja -v -j15 -l14 -C /var/tmp/portage/app-misc/geoclue-2.5.3-r2/work/geoclue-2.5.3-build failed
 * 
 * Call stack:
 *     ebuild.sh, line  125:  Called src_compile
 *   environment, line 2847:  Called meson_src_compile
 *   environment, line 1904:  Called eninja '-C' '/var/tmp/portage/app-misc/geoclue-2.5.3-r2/work/geoclue-2.5.3-build'
 *   environment, line 1274:  Called die
 * The specific snippet of code:
 *       "$@" || die "${nonfatal_args[@]}" "${*} failed"
 *

Despite the lines starting with “/usr/lib/python-exec/python3.6/meson”, there is an error for missing “python 3.5“.

Here is another example, just trying to execute the distcc-config and it immediately throws the error for missing “python 3.5“.

root@srv ~ # distcc-config 
/usr/bin/env: ‘python3.5’: No such file or directory

The python script distcc-config starts with:

root@srv ~ $ head /usr/bin/distcc-config
#!/usr/bin/env python3.5
# Copyright 1999-2018 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

import os, re, signal, subprocess, sys

options=[
        '--get-hosts',
        '--set-hosts',
        '--get-verbose',

Apparently, multiple programs use this technic to explicitly put a specific version of python in the header of the python script to be used. Thus grantees the version in the header will be used even you change the system or user-preferred Python interpreter.

But uninstalling this python version all these programs will stop working till you rebuild them with emerge.
Keep on reading!

pycurl.h: fatal error: openssl/ssl.h: No such file or directory

If you encounter this error trying to install a pip module or compile a program under the console you surely miss OpenSSL development packages!
pip also may build a packages in your system and it could depend on generic library headers like in this case OpenSSL, which the installer (pip) won’t bring them and it will output an error as you can see

myuser@srv # sudo pip install pycurl pygeoip psutil
Collecting pycurl
  Using cached https://files.pythonhosted.org/packages/e8/e4/0dbb8735407189f00b33d84122b9be52c790c7c3b25286826f4e1bdb7bde/pycurl-7.43.0.2.tar.gz
Requirement already satisfied (use --upgrade to upgrade): pygeoip in /usr/local/lib/python2.7/dist-packages
Requirement already satisfied (use --upgrade to upgrade): psutil in /usr/lib/python2.7/dist-packages
Building wheels for collected packages: pycurl
  Running setup.py bdist_wheel for pycurl ... error
  Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-AbCshS/pycurl/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" bdist_wheel -d /tmp/tmpqVNq1upip-wheel- --python-tag cp27:
  Using curl-config (libcurl 7.47.0)
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.linux-x86_64-2.7
  creating build/lib.linux-x86_64-2.7/curl
  copying python/curl/__init__.py -> build/lib.linux-x86_64-2.7/curl
  running build_ext
  building 'pycurl' extension
  creating build/temp.linux-x86_64-2.7
  creating build/temp.linux-x86_64-2.7/src
  x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -DPYCURL_VERSION="7.43.0.2" -DHAVE_CURL_SSL=1 -DHAVE_CURL_OPENSSL=1 -DHAVE_CURL_SSL=1 -I/usr/include/python2.7 -c src/docstrings.c -o build/temp.linux-x86_64-2.7/src/docstrings.o
  In file included from src/docstrings.c:4:0:
  src/pycurl.h:164:28: fatal error: openssl/ssl.h: No such file or directory
  compilation terminated.
  error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
  
  ----------------------------------------
  Failed building wheel for pycurl
  Running setup.py clean for pycurl
Failed to build pycurl
Installing collected packages: pycurl
  Running setup.py install for pycurl ... error
    Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-AbCshS/pycurl/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-oea_jq-record/install-record.txt --single-version-externally-managed --compile:
    Using curl-config (libcurl 7.47.0)
    running install
    running build
    running build_py
    creating build
    creating build/lib.linux-x86_64-2.7
    creating build/lib.linux-x86_64-2.7/curl
    copying python/curl/__init__.py -> build/lib.linux-x86_64-2.7/curl
    running build_ext
    building 'pycurl' extension
    creating build/temp.linux-x86_64-2.7
    creating build/temp.linux-x86_64-2.7/src
    x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -DPYCURL_VERSION="7.43.0.2" -DHAVE_CURL_SSL=1 -DHAVE_CURL_OPENSSL=1 -DHAVE_CURL_SSL=1 -I/usr/include/python2.7 -c src/docstrings.c -o build/temp.linux-x86_64-2.7/src/docstrings.o
    In file included from src/docstrings.c:4:0:
    src/pycurl.h:164:28: fatal error: openssl/ssl.h: No such file or directory
    compilation terminated.
    error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
    
    ----------------------------------------
Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-AbCshS/pycurl/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-oea_jq-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-AbCshS/pycurl/
You are using pip version 8.1.1, however version 18.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command

Keep on reading!

Ubuntu AttributeError: ‘module’ object has no attribute ‘SSL_ST_INIT’

If you install libraries with

pip

command you might find yourself in the following situation:

root@srv:~# pip
Traceback (most recent call last):
  File "/usr/bin/pip", line 9, in <module>
    from pip import main
  File "/usr/lib/python2.7/dist-packages/pip/__init__.py", line 13, in <module>
    from pip.exceptions import InstallationError, CommandError, PipError
  File "/usr/lib/python2.7/dist-packages/pip/exceptions.py", line 6, in <module>
    from pip._vendor.six import iteritems
  File "/usr/lib/python2.7/dist-packages/pip/_vendor/__init__.py", line 64, in <module>
    vendored("cachecontrol")
  File "/usr/lib/python2.7/dist-packages/pip/_vendor/__init__.py", line 36, in vendored
    __import__(modulename, globals(), locals(), level=0)
  File "/usr/share/python-wheels/CacheControl-0.11.5-py2.py3-none-any.whl/cachecontrol/__init__.py", line 9, in <module>
  File "/usr/share/python-wheels/CacheControl-0.11.5-py2.py3-none-any.whl/cachecontrol/wrapper.py", line 1, in <module>
  File "/usr/share/python-wheels/CacheControl-0.11.5-py2.py3-none-any.whl/cachecontrol/adapter.py", line 3, in <module>
  File "/usr/share/python-wheels/requests-2.9.1-py2.py3-none-any.whl/requests/__init__.py", line 53, in <module>
  File "/usr/share/python-wheels/urllib3-1.13.1-py2.py3-none-any.whl/urllib3/contrib/pyopenssl.py", line 54, in <module>
  File "/usr/local/lib/python2.7/dist-packages/OpenSSL/__init__.py", line 8, in <module>
    from OpenSSL import rand, crypto, SSL
  File "/usr/local/lib/python2.7/dist-packages/OpenSSL/SSL.py", line 124, in <module>
    SSL_ST_INIT = _lib.SSL_ST_INIT
AttributeError: 'module' object has no attribute 'SSL_ST_INIT'

Keep on reading!