Add bcond for Python 2 subpackage

PyYAML.spec

@@ -1,3 +1,6 @@
+# Prepared for Python 2 removal
+%bcond_without python2
+
 Name:           PyYAML
 Version:        5.1.2
 Release:        3%{?dist}
@@ -11,8 +14,10 @@ Source0:        https://github.com/yaml/pyyaml/archive/%{name}-%{uversion}.tar.g
 BuildRequires:  gcc
 BuildRequires:  libyaml-devel
 
+%if %{with python2}
 BuildRequires:  python2-devel
 BuildRequires:  python2-setuptools
+%endif
 
 BuildRequires:  python3-devel
 BuildRequires:  python3-setuptools
@@ -35,6 +40,7 @@ configuration files to object serialization and persistence.
 %description %_description
 
 
+%if %{with python2}
 %package -n python2-pyyaml
 Summary:        %summary
 Provides:       python-yaml = %{version}-%{release}
@@ -44,7 +50,7 @@ Provides:       python2-yaml%{?_isa} = %{version}-%{release}
 %{?python_provide:%python_provide python2-pyyaml}
 
 %description -n python2-pyyaml %_description
-
+%endif
 
 %package -n python3-pyyaml
 Summary:        %summary
@@ -70,24 +76,32 @@ rm -rf ext/_yaml.c
 %build
 %py3_build
 
+%if %{with python2}
 # py2_build reuses Cython output from py3_build
 %py2_build
+%endif
 
 
 %install
+%if %{with python2}
 %py2_install
+%endif
 %py3_install
 
 
 %check
+%if %{with python2}
 %{__python2} setup.py test
+%endif
 %{__python3} setup.py test
 
 
+%if %{with python2}
 %files -n python2-pyyaml
 %license LICENSE
 %doc CHANGES README examples
 %{python2_sitearch}/*
+%endif
 
 %files -n python3-pyyaml
 %license LICENSE