Install Python 3.7 from source code on Ubuntu 18.04

install-python-from-source.md

[12:12:41] pengxiao:~ $ sudo apt-get install libssl-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  libssl-doc libssl1.1
The following NEW packages will be installed:
  libssl-dev libssl-doc
The following packages will be upgraded:
  libssl1.1
1 upgraded, 2 newly installed, 0 to remove and 174 not upgraded.
Need to get 3759 kB of archives.
After this operation, 11.5 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libssl1.1 amd64 1.1.0g-2ubuntu4.3 [1130 kB]
Get:2 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libssl-dev amd64 1.1.0g-2ubuntu4.3 [1374 kB]
Get:3 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libssl-doc all 1.1.0g-2ubuntu4.3 [1255 kB]
Fetched 3759 kB in 1s (3831 kB/s)
Preconfiguring packages ...
(Reading database ... 30130 files and directories currently installed.)
Preparing to unpack .../libssl1.1_1.1.0g-2ubuntu4.3_amd64.deb ...
Unpacking libssl1.1:amd64 (1.1.0g-2ubuntu4.3) over (1.1.0g-2ubuntu4.1) ...
Selecting previously unselected package libssl-dev:amd64.
Preparing to unpack .../libssl-dev_1.1.0g-2ubuntu4.3_amd64.deb ...
Unpacking libssl-dev:amd64 (1.1.0g-2ubuntu4.3) ...
Selecting previously unselected package libssl-doc.
Preparing to unpack .../libssl-doc_1.1.0g-2ubuntu4.3_all.deb ...
Unpacking libssl-doc (1.1.0g-2ubuntu4.3) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Setting up libssl1.1:amd64 (1.1.0g-2ubuntu4.3) ...
Processing triggers for man-db (2.8.3-2) ...
Setting up libssl-doc (1.1.0g-2ubuntu4.3) ...
Setting up libssl-dev:amd64 (1.1.0g-2ubuntu4.3) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
[12:13:07] pengxiao:~ $
[12:14:02] pengxiao:~ $ wget https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tar.xz
Will not apply HSTS. The HSTS database must be a regular and non-world-writable file.
ERROR: could not open HSTS store at '/home/pengxiao/.wget-hsts'. HSTS will be disabled.
--2019-05-08 12:15:06--  https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tar.xz
Resolving www.python.org (www.python.org)... 151.101.36.223, 2a04:4e42:9::223
Connecting to www.python.org (www.python.org)|151.101.36.223|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 17108364 (16M) [application/octet-stream]
Saving to: ‘Python-3.7.3.tar.xz’

Python-3.7.3.tar.xz           100%[=================================================>]  16.32M  11.2MB/s    in 1.5s

2019-05-08 12:15:11 (11.2 MB/s) - ‘Python-3.7.3.tar.xz’ saved [17108364/17108364]

[12:16:15] pengxiao:~ $ tar xvf Python-3.7.3.tar.xz


[12:16:17] pengxiao:~ $ sudo apt install build-essential python3-dev libffi-dev zlib1g-dev

[12:21:01] pengxiao:~ $ cd Python-3.7.3
[12:21:05] pengxiao:Python-3.7.3 $ ./configure
........

checking for X509_VERIFY_PARAM_set1_host in libssl... yes
checking for --with-ssl-default-suites... python
configure: creating ./config.status
config.status: creating Makefile.pre
config.status: creating Misc/python.pc
config.status: creating Misc/python-config.sh
config.status: creating Modules/ld_so_aix
config.status: creating pyconfig.h
config.status: pyconfig.h is unchanged
creating Modules/Setup
creating Modules/Setup.local
creating Makefile


If you want a release build with all stable optimizations active (PGO, etc),
please run ./configure --enable-optimizations


[12:30:58] pengxiao:Python-3.7.3 $ make

.....
Python build finished successfully!
The necessary bits to build these optional modules were not found:
_bz2                  _curses               _curses_panel
_dbm                  _gdbm                 _lzma
_sqlite3              _tkinter              _uuid
readline              zlib
To find the necessary bits, look in setup.py in detect_modules() for the module's name.


The following modules found by detect_modules() in setup.py, have been
built by the Makefile instead, as configured by the Setup files:
_abc                  atexit                pwd
time

running build_scripts
copying and adjusting /home/pengxiao/Python-3.7.3/Tools/scripts/pydoc3 -> build/scripts-3.7
copying and adjusting /home/pengxiao/Python-3.7.3/Tools/scripts/idle3 -> build/scripts-3.7
copying and adjusting /home/pengxiao/Python-3.7.3/Tools/scripts/2to3 -> build/scripts-3.7
copying and adjusting /home/pengxiao/Python-3.7.3/Tools/scripts/pyvenv -> build/scripts-3.7
changing mode of build/scripts-3.7/pydoc3 from 666 to 777
changing mode of build/scripts-3.7/idle3 from 666 to 777
changing mode of build/scripts-3.7/2to3 from 666 to 777
changing mode of build/scripts-3.7/pyvenv from 666 to 777
renaming build/scripts-3.7/pydoc3 to build/scripts-3.7/pydoc3.7
renaming build/scripts-3.7/idle3 to build/scripts-3.7/idle3.7
renaming build/scripts-3.7/2to3 to build/scripts-3.7/2to3-3.7
renaming build/scripts-3.7/pyvenv to build/scripts-3.7/pyvenv-3.7
[12:36:10] pengxiao:Python-3.7.3 $ sudo make install



[14:16:15] pengxiao:demo $ python3.7
Python 3.7.3 (default, May  8 2019, 12:35:03)
[GCC 7.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
[14:16:19] pengxiao:demo $
[14:16:19] pengxiao:demo $
[14:16:19] pengxiao:demo $ mkdir demo
[14:16:20] pengxiao:demo $ cd demo
[14:16:20] pengxiao:demo $ python3.7 -m venv .env
[14:16:33] pengxiao:demo $ source .env/bin/activate
(.env) [14:16:40] pengxiao:demo $ pip3 install flask