old_contents: from collections import defaultdict
  from logging import getLogger
  from typing import Any, DefaultDict
  
  from pip._vendor.resolvelib.reporters import BaseReporter
  
  from .base import Candidate, Requirement
  
  logger = getLogger(__name__)
  
  
  class PipReporter(BaseReporter):
      def __init__(self) -> None:
          self.backtracks_by_package: DefaultDict[str, int] = defaultdict(int)
  
          self._messages_at_backtrack = {
              1: (
                  "pip is looking at multiple versions of {package_name} to "
                  "determine which version is compatible with other "
                  "requirements. This could take a while."
              ),
              8: (
                  "pip is looking at multiple versions of {package_name} to "
                  "determine which version is compatible with other "
                  "requirements. This could take a while."
              ),
              13: (
                  "This is taking longer than usual. You might need to provide "
                  "the dependency resolver with stricter constraints to reduce "
                  "runtime. If you want to abort this run, you can press "
                  "Ctrl + C to do so. To improve how pip performs, tell us what "
                  "happened here: https://pip.pypa.io/surveys/backtracking"
              ),
          }
  
      def backtracking(self, candidate: Candidate) -> None:
          self.backtracks_by_package[candidate.name] += 1
  
          count = self.backtracks_by_package[candidate.name]
          if count not in self._messages_at_backtrack:
              return
  
          message = self._messages_at_backtrack[count]
          logger.info("INFO: %s", message.format(package_name=candidate.name))
  
  
  class PipDebuggingReporter(BaseReporter):
      """A reporter that does an info log for every event it sees."""
  
      def starting(self) -> None:
          logger.info("Reporter.starting()")
  
      def starting_round(self, index: int) -> None:
          logger.info("Reporter.starting_round(%r)", index)
  
      def ending_round(self, index: int, state: Any) -> None:
          logger.info("Reporter.ending_round(%r, state)", index)
  
      def ending(self, state: Any) -> None:
          logger.info("Reporter.ending(%r)", state)
  
      def adding_requirement(self, requirement: Requirement, parent: Candidate) -> None:
          logger.info("Reporter.adding_requirement(%r, %r)", requirement, parent)
  
      def backtracking(self, candidate: Candidate) -> None:
          logger.info("Reporter.backtracking(%r)", candidate)
  
      def pinning(self, candidate: Candidate) -> None:
          logger.info("Reporter.pinning(%r)", candidate)
  
new_contents: from collections import defaultdict
  from logging import getLogger
  from typing import Any, DefaultDict
  
  from pip._vendor.resolvelib.reporters import BaseReporter
  
  from .base import Candidate, Requirement
  
  logger = getLogger(__name__)
  
  
  class PipReporter(BaseReporter):
      def __init__(self) -> None:
          self.backtracks_by_package: DefaultDict[str, int] = defaultdict(int)
  
          self._messages_at_backtrack = {
              1: (
                  "pip is looking at multiple versions of {package_name} to "
                  "determine which version is compatible with other "
                  "requirements. This could take a while."
              ),
              8: (
                  "pip is looking at multiple versions of {package_name} to "
                  "determine which version is compatible with other "
                  "requirements. This could take a while."
              ),
              13: (
                  "This is taking longer than usual. You might need to provide "
                  "the dependency resolver with stricter constraints to reduce "
                  "runtime. If you want to abort this run, you can press "
                  "Ctrl + C to do so."
              ),
          }
  
      def backtracking(self, candidate: Candidate) -> None:
          self.backtracks_by_package[candidate.name] += 1
  
          count = self.backtracks_by_package[candidate.name]
          if count not in self._messages_at_backtrack:
              return
  
          message = self._messages_at_backtrack[count]
          logger.info("INFO: %s", message.format(package_name=candidate.name))
  
  
  class PipDebuggingReporter(BaseReporter):
      """A reporter that does an info log for every event it sees."""
  
      def starting(self) -> None:
          logger.info("Reporter.starting()")
  
      def starting_round(self, index: int) -> None:
          logger.info("Reporter.starting_round(%r)", index)
  
      def ending_round(self, index: int, state: Any) -> None:
          logger.info("Reporter.ending_round(%r, state)", index)
  
      def ending(self, state: Any) -> None:
          logger.info("Reporter.ending(%r)", state)
  
      def adding_requirement(self, requirement: Requirement, parent: Candidate) -> None:
          logger.info("Reporter.adding_requirement(%r, %r)", requirement, parent)
  
      def backtracking(self, candidate: Candidate) -> None:
          logger.info("Reporter.backtracking(%r)", candidate)
  
      def pinning(self, candidate: Candidate) -> None:
          logger.info("Reporter.pinning(%r)", candidate)
  
subject: Remove backtracking survey link