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Lib/site-packages/pipenv/vendor/resolvelib/reporters.py

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+class BaseReporter(object):
+    """Delegate class to provider progress reporting for the resolver.
+    """
+
+    def starting(self):
+        """Called before the resolution actually starts.
+        """
+
+    def starting_round(self, index):
+        """Called before each round of resolution starts.
+
+        The index is zero-based.
+        """
+
+    def ending_round(self, index, state):
+        """Called before each round of resolution ends.
+
+        This is NOT called if the resolution ends at this round. Use `ending`
+        if you want to report finalization. The index is zero-based.
+        """
+
+    def ending(self, state):
+        """Called before the resolution ends successfully.
+        """
+
+    def adding_requirement(self, requirement):
+        """Called when the resolver adds a new requirement into the resolve criteria.
+        """
+
+    def backtracking(self, candidate):
+        """Called when the resolver rejects a candidate during backtracking.
+        """
+
+    def pinning(self, candidate):
+        """Called when adding a candidate to the potential solution.
+        """