Upgrade to pyo3 0.18

[alex]

Follow up action items:

• Convert crate::intern!() to use pyo3::intern!() for basically all static strings which are converted to PyObject
• Use Py<PyBytes>::as_bytes instead of copying data to vec.
• Remove let py = gil.python(); in many places
• investigate moving some enums into rust

[reaperhulk]

Could you also rebase this just to see if it fixes coverage?

[alex]

@reaperhulk it won't -- the coverage issue is caused by removing the RHEL8-fips builder because it's py36. When we get to this point we'll need to decide what to do about that.

[tiran]

@reaperhulk it won't -- the coverage issue is caused by removing the RHEL8-fips builder because it's py36. When we get to this point we'll need to decide what to do about that.

RHEL 8 comes with Python 3.8 and 3.9.

# dnf install -y python38-devel python38-pip
...
=================================================================================================================================================
 Package                               Architecture       Version                                               Repository                  Size
=================================================================================================================================================
Installing:
 python38-devel                        x86_64             3.8.8-4.module+el8.5.0+12205+a865257a                 rhel-AppStream             276 k
 python38-pip                          noarch             19.3.1-4.module+el8.5.0+12205+a865257a                rhel-AppStream             1.9 M
Installing dependencies:
 python38                              x86_64             3.8.8-4.module+el8.5.0+12205+a865257a                 rhel-AppStream              79 k
 python38-libs                         x86_64             3.8.8-4.module+el8.5.0+12205+a865257a                 rhel-AppStream             8.3 M
 python38-pip-wheel                    noarch             19.3.1-4.module+el8.5.0+12205+a865257a                rhel-AppStream             1.2 M
 python38-setuptools                   noarch             41.6.0-5.module+el8.5.0+12205+a865257a                rhel-AppStream             668 k
 python38-setuptools-wheel             noarch             41.6.0-5.module+el8.5.0+12205+a865257a                rhel-AppStream             304 k
Enabling module streams:
 python38                                                 3.8                                                                                   

Transaction Summary
=================================================================================================================================================
Install  7 Packages
...

[alex]

Ah interesting, I guess we should send a PR to infra to install in addition to the base python3 package.

[tiran]

Not all Python 3.6 modules are available. The AppStream modules for 3.8 and 3.9 provide a limited subset of important packages. cryptography is considered important. 🥇

======================================================== Name Exactly Matched: python38 =========================================================
python38.x86_64 : Interpreter of the Python programming language
============================================================ Name Matched: python38 =============================================================
python38-Cython.x86_64 : Language for writing Python extension modules
python38-PyMySQL.noarch : Pure-Python MySQL client library
python38-asn1crypto.noarch : Fast Python ASN.1 parser and serializer
python38-babel.noarch : Library for internationalizing Python applications
python38-cffi.x86_64 : Foreign Function Interface for Python 3 to call C code
python38-chardet.noarch : Character encoding auto-detection in Python
python38-cryptography.x86_64 : PyCA's cryptography library
python38-debug.x86_64 : Debug version of the Python runtime
python38-devel.x86_64 : Libraries and header files needed for Python development
python38-idle.x86_64 : A basic graphical development environment for Python
python38-idna.noarch : Internationalized Domain Names in Applications (IDNA)
python38-jinja2.noarch : General purpose template engine for python3
python38-libs.x86_64 : Python runtime libraries
python38-lxml.x86_64 : XML processing library combining libxml2/libxslt with the ElementTree API
python38-markupsafe.x86_64 : Implements a XML/HTML/XHTML Markup safe string for Python 3
python38-mod_wsgi.x86_64 : A WSGI interface for Python web applications in Apache
python38-numpy.x86_64 : A fast multidimensional array facility for Python
python38-numpy-doc.noarch : Documentation for numpy
python38-numpy-f2py.x86_64 : f2py for numpy
python38-pip.noarch : A tool for installing and managing Python3 packages
python38-pip-wheel.noarch : The pip wheel
python38-ply.noarch : Python Lex-Yacc
python38-psutil.x86_64 : A process and system utilities module for Python
python38-psycopg2.x86_64 : A PostgreSQL database adapter for Python 3
python38-psycopg2-doc.x86_64 : Documentation for psycopg python PostgreSQL database adapter
python38-psycopg2-tests.x86_64 : A testsuite for A PostgreSQL database adapter for Python 2
python38-pycparser.noarch : C parser and AST generator written in Python
python38-pysocks.noarch : A Python SOCKS client module
python38-pytz.noarch : World Timezone Definitions for Python
python38-pyyaml.x86_64 : YAML parser and emitter for Python
python38-requests.noarch : HTTP library, written in Python, for human beings
python38-rpm-macros.noarch : RPM macros for building RPMs with Python 3.8
python38-scipy.x86_64 : Scientific Tools for Python
python38-setuptools.noarch : Easily build and distribute Python 3 packages
python38-setuptools-wheel.noarch : The setuptools wheel
python38-six.noarch : Python 2 and 3 compatibility utilities
python38-test.x86_64 : The self-test suite for the main python3 package
python38-tkinter.x86_64 : A GUI toolkit for Python
python38-urllib3.noarch : Python3 HTTP library with thread-safe connection pooling and file post
python38-wheel.noarch : Built-package format for Python
python38-wheel-wheel.noarch : The Python wheel module packaged as a wheel