Extract method for comparing prerelease. Satisfies complexity check.

Author: jaraco

distutils/version.py

@@ -178,7 +178,7 @@ def __str__(self):
 
         return vstring
 
-    def _cmp(self, other):  # noqa: C901
+    def _cmp(self, other):
         if isinstance(other, str):
             with suppress_known_deprecation():
                 other = StrictVersion(other)
@@ -193,25 +193,28 @@ def _cmp(self, other):  # noqa: C901
             else:
                 return 1
 
-        # have to compare prerelease
-        # case 1: neither has prerelease; they're equal
-        # case 2: self has prerelease, other doesn't; other is greater
-        # case 3: self doesn't have prerelease, other does: self is greater
-        # case 4: both have prerelease: must compare them!
+        return self._cmp_prerelease(other)
 
+    def _cmp_prerelease(self, other):
+        """
+        case 1: neither has prerelease; they're equal
+        case 2: self has prerelease, other doesn't; other is greater
+        case 3: self doesn't have prerelease, other does: self is greater
+        case 4: both have prerelease: must compare them!
+        """
         if not self.prerelease and not other.prerelease:
             return 0
         elif self.prerelease and not other.prerelease:
             return -1
         elif not self.prerelease and other.prerelease:
             return 1
-        elif self.prerelease and other.prerelease:
-            if self.prerelease == other.prerelease:
-                return 0
-            elif self.prerelease < other.prerelease:
-                return -1
-            else:
-                return 1
+
+        if self.prerelease == other.prerelease:
+            return 0
+        elif self.prerelease < other.prerelease:
+            return -1
+        else:
+            return 1
 
 
 # end class StrictVersion