Description of problem:
When installing python3-qgis, a Python2 version of python-sip is pulled in, instead of the Python3 version.

This is probably because of lack of explicit runtime dependency with python version. It is result of using only sip-api as Requires (as mentioned in Bug #1714218 comment #1)

[root@d2fc663cafd3 /]# cat /etc/fedora-release 
Fedora release 30 (Thirty)

[root@d2fc663cafd3 /]# dnf repoquery --whatrequires python2-sip
Last metadata expiration check: 0:27:01 ago on Mon 27 May 2019 11:35:23 AM UTC.
PyQwt-0:5.2.0-40.fc29.i686
PyQwt-0:5.2.0-40.fc29.x86_64
PyQwt-0:5.2.0-42.fc30.i686
PyQwt-0:5.2.0-42.fc30.x86_64
avogadro-libs-0:1.2.0-24.fc30.i686
avogadro-libs-0:1.2.0-24.fc30.x86_64
avogadro-libs-0:1.2.0-25.fc30.i686
avogadro-libs-0:1.2.0-25.fc30.x86_64
calibre-0:3.36.0-4.fc30.x86_64
pykde4-0:4.14.3-30.fc30.i686
pykde4-0:4.14.3-30.fc30.x86_64
python2-wxpython4-0:4.0.4-2.fc30.x86_64
python3-poppler-qt5-0:0.24.2-11.fc30.x86_64
python3-qgis-0:3.4.4-3.fc30.i686
python3-qgis-0:3.4.4-3.fc30.x86_64
python3-qgis-0:3.4.6-1.fc30.i686
python3-qgis-0:3.4.6-1.fc30.x86_64

[root@d2fc663cafd3 /]# dnf repoquery --requires python3-qgis
gdal-python3
libQt5Core.so.5
libQt5Core.so.5()(64bit)
libQt5Core.so.5(Qt_5)
libQt5Core.so.5(Qt_5)(64bit)
libQt5Core.so.5(Qt_5.11)
libQt5Core.so.5(Qt_5.11)(64bit)
libQt5Core.so.5(Qt_5.12)
libQt5Core.so.5(Qt_5.12)(64bit)
libQt5Gui.so.5
libQt5Gui.so.5()(64bit)
libQt5Gui.so.5(Qt_5)
libQt5Gui.so.5(Qt_5)(64bit)
libQt5Network.so.5
libQt5Network.so.5()(64bit)
libQt5Network.so.5(Qt_5)
libQt5Network.so.5(Qt_5)(64bit)
libQt5Svg.so.5
libQt5Svg.so.5()(64bit)
libQt5Svg.so.5(Qt_5)
libQt5Svg.so.5(Qt_5)(64bit)
libQt5Widgets.so.5
libQt5Widgets.so.5()(64bit)
libQt5Widgets.so.5(Qt_5)
libQt5Widgets.so.5(Qt_5)(64bit)
libQt5Xml.so.5
libQt5Xml.so.5()(64bit)
libQt5Xml.so.5(Qt_5)
libQt5Xml.so.5(Qt_5)(64bit)
libc.so.6(GLIBC_2.14)(64bit)
libc.so.6(GLIBC_2.4)
libgcc_s.so.1
libgcc_s.so.1()(64bit)
libgcc_s.so.1(GCC_3.0)
libgcc_s.so.1(GCC_3.0)(64bit)
libgcc_s.so.1(GLIBC_2.0)
libm.so.6
libm.so.6()(64bit)
libm.so.6(GLIBC_2.0)
libm.so.6(GLIBC_2.1)
libm.so.6(GLIBC_2.2.5)(64bit)
libm.so.6(GLIBC_2.29)
libm.so.6(GLIBC_2.29)(64bit)
libpython3.7m.so.1.0
libpython3.7m.so.1.0()(64bit)
libqca-qt5.so.2
libqca-qt5.so.2()(64bit)
libqgis_3d.so.3.4.4
libqgis_3d.so.3.4.4()(64bit)
libqgis_3d.so.3.4.6
libqgis_3d.so.3.4.6()(64bit)
libqgis_analysis.so.3.4.4
libqgis_analysis.so.3.4.4()(64bit)
libqgis_analysis.so.3.4.6
libqgis_analysis.so.3.4.6()(64bit)
libqgis_core.so.3.4.4
libqgis_core.so.3.4.4()(64bit)
libqgis_core.so.3.4.6
libqgis_core.so.3.4.6()(64bit)
libqgis_gui.so.3.4.4
libqgis_gui.so.3.4.4()(64bit)
libqgis_gui.so.3.4.6
libqgis_gui.so.3.4.6()(64bit)
libqscintilla2_qt5.so.15
libqscintilla2_qt5.so.15()(64bit)
libstdc++.so.6
libstdc++.so.6()(64bit)
libstdc++.so.6(CXXABI_1.3)
libstdc++.so.6(CXXABI_1.3)(64bit)
libstdc++.so.6(CXXABI_1.3.8)
libstdc++.so.6(CXXABI_1.3.8)(64bit)
libstdc++.so.6(GLIBCXX_3.4)
libstdc++.so.6(GLIBCXX_3.4)(64bit)
python(abi) = 3.7
python3-OWSLib
python3-PyYAML
python3-httplib2
python3-jinja2
python3-matplotlib
python3-psycopg2
python3-pygments
python3-qscintilla
qgis(x86-32) = 3.4.4-3.fc30
qgis(x86-32) = 3.4.6-1.fc30
qgis(x86-64) = 3.4.4-3.fc30
qgis(x86-64) = 3.4.6-1.fc30
rtld(GNU_HASH)
sip-api(12) >= 12.5

Version-Release number of selected component (if applicable):
python3-qgis-0:3.4.4-3.fc30

How reproducible:
always

Steps to Reproduce:
1. install python3-qgis on F30
2.
3.

Actual results:
python2-sip is pulled in as runtime dependency

Expected results:
python3-sip is pulled in as runtime dependency