dnf-api-example.py

import dnf

cachedir = '_dnf_cache_dir'
the_arch = 'x86_64'

base = dnf.Base()
conf = base.conf
conf.cachedir = cachedir
conf.substitutions['releasever'] = '32'
conf.substitutions['basearch'] = the_arch

base.repos.add_new_repo('rawhide', conf,
    baseurl=["http://download.fedoraproject.org/pub/fedora/linux/development/rawhide//Everything/$basearch/os/"])
base.repos.add_new_repo('rawhide-source', conf,
    baseurl=["http://download.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/source/tree/"])
base.fill_sack(load_system_repo=False)

python27_src_packages = base.sack.query().filter(name='python27')

for pkg in python27_src_packages:
    for provide in pkg.provides:
        print('provide:', provide)
        whatreqs = base.sack.query().filter(requires=provide)
        for whatreq in whatreqs:
            print('required by:', whatreq)