@@ -32,22 +32,20 @@ def get_version(version_file=STATIC_VERSION_FILE):

             version = get_version_from_git_archive(version_info)

         if not version:

             version = Version("unknown", None, None)

-        return semver_format(version)

+        return pep440_format(version)

     else:

         return version

-def semver_format(version_info):

+def pep440_format(version_info):

     release, dev, labels = version_info

     version_parts = [release]

     if dev:

-        if release.endswith('-dev'):

+        if release.endswith('-dev') or release.endswith('.dev'):

             version_parts.append(dev)

-        elif release.contains('-'):

+        else:  # prefer PEP440 over stric adhesion to semver

             version_parts.append('.dev{}'.format(dev))

-        else:

-            version_parts.append('-dev{}'.format(dev))

     if labels:

         version_parts.append('+')

@@ -130,7 +128,7 @@ def get_version_from_git_archive(version_info):

         release, *_ = sorted(version_tags)  # prefer e.g. "2.0" over "2.0rc1"

         return Version(release, dev=None, labels=None)

     else:

-        return Version('unknown', dev=None, labels=[f'g{git_hash}'])

+        return Version('unknown', dev=None, labels=['g{}'.format(git_hash)])

 __version__ = get_version()