Change: Mark calculator module as "private"

If the VersionCalculator class is used it should always be imported from
pontos.version.

Author: bjoernricks

pontos/version/__init__.py

@@ -16,6 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from .__version__ import __version__
+from ._calculator import VersionCalculator
 from .errors import VersionError
 from .main import main
 from .version import Version, VersionCommand, VersionUpdate, parse_version
@@ -26,5 +27,6 @@
     "parse_version",
     "Version",
     "VersionCommand",
+    "VersionCalculator",
     "VersionUpdate",
 )

pontos/version/calculator.py renamed to pontos/version/_calculator.py

@@ -20,8 +20,7 @@
 from packaging.version import InvalidVersion
 from packaging.version import Version as PackagingVersion
 
-from pontos.version.calculator import VersionCalculator
-
+from .._calculator import VersionCalculator
 from ..errors import VersionError
 from ..version import Version
 from ._scheme import VersioningScheme

pontos/version/schemes/_pep440.py

@@ -18,7 +18,7 @@
 from abc import ABC
 from typing import Type
 
-from ..calculator import VersionCalculator
+from .._calculator import VersionCalculator
 from ..version import Version
 
 

pontos/version/schemes/_scheme.py

@@ -20,9 +20,8 @@
 
 from semver import VersionInfo
 
-from pontos.version.calculator import VersionCalculator
-from pontos.version.errors import VersionError
-
+from .._calculator import VersionCalculator
+from ..errors import VersionError
 from ..version import Version
 from ._scheme import VersioningScheme