old_contents: #!/usr/bin/env python
  
  import json
  import sys
  
  try:
          from pip._internal.req import parse_requirements
  except ImportError:
          from pip.req import parse_requirements
  try:
          from pip._internal.download import PipSession
  except ImportError:
          from pip.download import PipSession
  
  from pip._vendor import pkg_resources
  from pip._vendor.six import print_
  
  reqs = []
  for req in parse_requirements(sys.argv[1], session=PipSession()):
      if req.req == None or (req.markers != None and not req.markers.evaluate()): continue
      reqs.append(req)
  
  requirements = [pkg_resources.Requirement.parse(str(req.req)) for req in reqs]
  
  transform = lambda dist: {
          'name': dist.project_name,
          'version': dist.version,
          'location': dist.location,
          'dependencies': list(map(lambda dependency: dependency.project_name, dist.requires())),
          }
  
  packages = [transform(dist) for dist
              in pkg_resources.working_set.resolve(requirements)]
  
  print_(json.dumps(packages))
  
new_contents: #!/usr/bin/env python
  
  import json
  import sys
  
  try:
          from pip._internal.req import parse_requirements
  except ImportError:
          from pip.req import parse_requirements
  
  try:
      # since pip 19.3
      from pip._internal.network.session import PipSession
  except ImportError:
      try:
          # since pip 10
          from pip._internal.download import PipSession
      except ImportError:
          from pip.download import PipSession
  
  from pip._vendor import pkg_resources
  from pip._vendor.six import print_
  
  reqs = []
  for req in parse_requirements(sys.argv[1], session=PipSession()):
      if req.req == None or (req.markers != None and not req.markers.evaluate()): continue
      reqs.append(req)
  
  requirements = [pkg_resources.Requirement.parse(str(req.req)) for req in reqs]
  
  transform = lambda dist: {
          'name': dist.project_name,
          'version': dist.version,
          'location': dist.location,
          'dependencies': list(map(lambda dependency: dependency.project_name, dist.requires())),
          }
  
  packages = [transform(dist) for dist
              in pkg_resources.working_set.resolve(requirements)]
  
  print_(json.dumps(packages))
  
subject: Support finding licenses with pip>=19.3