text: # Copyright (c) 2008 Chris Moyer http://coredumped.org/
  #
  # Permission is hereby granted, free of charge, to any person obtaining a
  # copy of this software and associated documentation files (the
  # "Software"), to deal in the Software without restriction, including
  # without limitation the rights to use, copy, modify, merge, publish, dis-
  # tribute, sublicense, and/or sell copies of the Software, and to permit
  # persons to whom the Software is furnished to do so, subject to the fol-
  # lowing conditions:
  #
  # The above copyright notice and this permission notice shall be included
  # in all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
  # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
  # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  # IN THE SOFTWARE.
  
  class Qualifications(object):
  
      def __init__(self, requirements=None):
          if requirements is None:
              requirements = []
          self.requirements = requirements
  
      def add(self, req):
          self.requirements.append(req)
  
      def get_as_params(self):
          params = {}
          assert(len(self.requirements) <= 10)
          for n, req in enumerate(self.requirements):
              reqparams = req.get_as_params()
              for rp in reqparams:
                  params['QualificationRequirement.%s.%s' % ((n+1), rp) ] = reqparams[rp]
          return params
  
  
  class Requirement(object):
      """
      Representation of a single requirement
      """
  
      def __init__(self, qualification_type_id, comparator, integer_value=None, required_to_preview=False):
          self.qualification_type_id = qualification_type_id
          self.comparator = comparator
          self.integer_value = integer_value
          self.required_to_preview = required_to_preview
  
      def get_as_params(self):
          params =  {
              "QualificationTypeId": self.qualification_type_id,
              "Comparator": self.comparator,
          }
          if self.comparator in ('In', 'NotIn'):
              for i, integer_value in enumerate(self.integer_value, 1):
                  params['IntegerValue.%d' % i] = integer_value
          elif self.comparator not in ('Exists', 'DoesNotExist') and self.integer_value is not None:
              params['IntegerValue'] = self.integer_value
          if self.required_to_preview:
              params['RequiredToPreview'] = "true"
          return params
  
  class PercentAssignmentsSubmittedRequirement(Requirement):
      """
      The percentage of assignments the Worker has submitted, over all assignments the Worker has accepted. The value is an integer between 0 and 100.
      """
  
      def __init__(self, comparator, integer_value, required_to_preview=False):
          super(PercentAssignmentsSubmittedRequirement, self).__init__(qualification_type_id="00000000000000000000", comparator=comparator, integer_value=integer_value, required_to_preview=required_to_preview)
  
  class PercentAssignmentsAbandonedRequirement(Requirement):
      """
      The percentage of assignments the Worker has abandoned (allowed the deadline to elapse), over all assignments the Worker has accepted. The value is an integer between 0 and 100.
      """
  
      def __init__(self, comparator, integer_value, required_to_preview=False):
          super(PercentAssignmentsAbandonedRequirement, self).__init__(qualification_type_id="00000000000000000070", comparator=comparator, integer_value=integer_value, required_to_preview=required_to_preview)
  
  class PercentAssignmentsReturnedRequirement(Requirement):
      """
      The percentage of assignments the Worker has returned, over all assignments the Worker has accepted. The value is an integer between 0 and 100.
      """
  
      def __init__(self, comparator, integer_value, required_to_preview=False):
          super(PercentAssignmentsReturnedRequirement, self).__init__(qualification_type_id="000000000000000000E0", comparator=comparator, integer_value=integer_value, required_to_preview=required_to_preview)
  
  class PercentAssignmentsApprovedRequirement(Requirement):
      """
      The percentage of assignments the Worker has submitted that were subsequently approved by the Requester, over all assignments the Worker has submitted. The value is an integer between 0 and 100.
      """
  
      def __init__(self, comparator, integer_value, required_to_preview=False):
          super(PercentAssignmentsApprovedRequirement, self).__init__(qualification_type_id="000000000000000000L0", comparator=comparator, integer_value=integer_value, required_to_preview=required_to_preview)
  
  class PercentAssignmentsRejectedRequirement(Requirement):
      """
      The percentage of assignments the Worker has submitted that were subsequently rejected by the Requester, over all assignments the Worker has submitted. The value is an integer between 0 and 100.
      """
  
      def __init__(self, comparator, integer_value, required_to_preview=False):
          super(PercentAssignmentsRejectedRequirement, self).__init__(qualification_type_id="000000000000000000S0", comparator=comparator, integer_value=integer_value, required_to_preview=required_to_preview)
  
  class NumberHitsApprovedRequirement(Requirement):
      """
      Specifies the total number of HITs submitted by a Worker that have been approved. The value is an integer greater than or equal to 0.
  
      If specifying a Country and Subdivision, use a tuple of valid  ISO 3166 country code and ISO 3166-2 subdivision code, e.g. ('US', 'CA') for the US State of California.
  
      When using the 'In' and 'NotIn', locale should be a list of Countries and/or (Country, Subdivision) tuples.
  
      """
  
      def __init__(self, comparator, integer_value, required_to_preview=False):
          super(NumberHitsApprovedRequirement, self).__init__(qualification_type_id="00000000000000000040", comparator=comparator, integer_value=integer_value, required_to_preview=required_to_preview)
  
  class LocaleRequirement(Requirement):
      """
      A Qualification requirement based on the Worker's location. The Worker's location is specified by the Worker to Mechanical Turk when the Worker creates his account.
      """
  
      def __init__(self, comparator, locale, required_to_preview=False):
          super(LocaleRequirement, self).__init__(qualification_type_id="00000000000000000071", comparator=comparator, integer_value=None, required_to_preview=required_to_preview)
          self.locale = locale
  
      def get_as_params(self):
          params =  {
              "QualificationTypeId": self.qualification_type_id,
              "Comparator": self.comparator,
          }
          if self.comparator in ('In', 'NotIn'):
              for i, locale in enumerate(self.locale, 1):
                  if isinstance(locale, tuple):
                      params['LocaleValue.%d.Country' % i] = locale[0]
                      params['LocaleValue.%d.Subdivision' % i] = locale[1]
                  else:
                      params['LocaleValue.%d.Country' % i] = locale
          else:
              if isinstance(self.locale, tuple):
                  params['LocaleValue.Country'] = self.locale[0]
                  params['LocaleValue.Subdivision'] = self.locale[1]
              else:
                  params['LocaleValue.Country'] = self.locale
          if self.required_to_preview:
              params['RequiredToPreview'] = "true"
          return params
  
  class AdultRequirement(Requirement):
      """
      Requires workers to acknowledge that they are over 18 and that they agree to work on potentially offensive content. The value type is boolean, 1 (required), 0 (not required, the default).
      """
  
      def __init__(self, comparator, integer_value, required_to_preview=False):
          super(AdultRequirement, self).__init__(qualification_type_id="00000000000000000060", comparator=comparator, integer_value=integer_value, required_to_preview=required_to_preview)
  