text: import json
  import re
  
  from ochrona.db import VulnDB
  from ochrona.eval.vuln import evaluate
  from ochrona.eval.policy import policy_evaluate
  from ochrona.log import OchronaLogger
  from ochrona.model.dependency_set import DependencySet
  from ochrona.model.dependency import Dependency
  
  PEP_SUPPORTED_OPERATORS: str = r"==|>=|<=|!=|~=|<|>"
  PEP_SUPPORTED_OPERATORS_CAPTURE: str = r"(==|>=|<=|!=|~=|<|>)"
  
  
  def resolve(logger: OchronaLogger, dependencies=[], policies=[]) -> DependencySet:
      """
      Resolves a list of dependencies into a PythonDependencies object
      """
      db = VulnDB(logger=logger)
      resp = DependencySet([Dependency(dep) for dep in dependencies])
      vulns = []
      for dep in resp.flat_list:
          vulns += db.lookup_by_name(_safe_query_name(dep))
  
      if vulns:
          resp.confirmed_vulnerabilities = evaluate(vulns, resp.flat_list)
  
      if len(policies) > 0:
          resp.policy_violations = policy_evaluate(dependencies=resp, policies=policies)
      return resp
  
  
  def _safe_query_name(package_name):
      return re.split(PEP_SUPPORTED_OPERATORS, package_name)[0]
  
  
  def _dedupe_dependencies(flat_list):
      """
      Deduplicates the flat list of dependencies to a true set resolving to what we believe is the actual resolution.
      """
      dependency_dict = collections.OrderedDict()
      for dependency in flat_list:
          simple_name = re.split(PEP_SUPPORTED_OPERATORS, dependency)[0]
          if simple_name not in dependency_dict:
              dependency_dict[simple_name] = [dependency]
          else:
              dependency_dict[simple_name].append(dependency)
  
      final_list = []
      for package_name, version_list in dependency_dict.items():
          final_list.append(_return_best_fit(package_name, *version_list))
      return final_list
  
  
  def _return_best_fit(base, *versions):
      """
      Returns the best fit semver.
  
      Note: entries should be somewhat in order of appearance.
      """
      # if only one entry exists, return that
      if len(versions) == 1:
          return versions[0]
      # filter out entries with no version details
      filtered = list(
          filter(lambda v: v if re.search(PEP_SUPPORTED_OPERATORS, v) else None, versions)
      )
      # if all entries were lacking version details, return the base package name
      if not filtered:
          return base
      filtered_split = list(
          map(lambda v: re.split(PEP_SUPPORTED_OPERATORS_CAPTURE, v), filtered)
      )
      operator_list = list(map(lambda o: o[1], filtered_split))
      if "==" in operator_list:
          # If we need an exact match we should take the highest, not the first
          exact_versions = list(
              sorted(
                  [
                      [parse(pkg[2]), i]
                      for i, pkg in enumerate(filtered_split)
                      if pkg[1] == "=="
                  ],
                  key=lambda x: x[0],
                  reverse=True,
              )
          )
          return filtered[exact_versions[0][1]]
      if "<=" in operator_list:
          # If we have a less than situation we need to determine the upper bound
          upper_bound = filtered_split.index("<=")[2]
      # Finally return the highest in the list that does not violate the upper bound
      gt_versions = list(
          sorted(
              [
                  [parse(pkg[2]), i]
                  for i, pkg in enumerate(filtered_split)
                  if pkg[1] == ">="
              ],
              key=lambda x: x[0],
              reverse=True,
          )
      )
      if len(gt_versions) > 0:
          return filtered[gt_versions[0][1]]
      return filtered[0]
  