diff --git a/rest_framework/exceptions.py b/rest_framework/exceptions.py index 236087bde..8447a9ded 100644 --- a/rest_framework/exceptions.py +++ b/rest_framework/exceptions.py @@ -30,10 +30,10 @@ def _force_text_recursive(data): return ReturnList(ret, serializer=data.serializer) return data elif isinstance(data, dict): - ret = dict([ - (key, _force_text_recursive(value)) + ret = { + key: _force_text_recursive(value) for key, value in data.items() - ]) + } if isinstance(data, ReturnDict): return ReturnDict(ret, serializer=data.serializer) return data diff --git a/rest_framework/fields.py b/rest_framework/fields.py index 0d4a51152..0b214b872 100644 --- a/rest_framework/fields.py +++ b/rest_framework/fields.py @@ -604,8 +604,8 @@ class BooleanField(Field): } default_empty_html = False initial = False - TRUE_VALUES = set(('t', 'T', 'true', 'True', 'TRUE', '1', 1, True)) - FALSE_VALUES = set(('f', 'F', 'false', 'False', 'FALSE', '0', 0, 0.0, False)) + TRUE_VALUES = {'t', 'T', 'true', 'True', 'TRUE', '1', 1, True} + FALSE_VALUES = {'f', 'F', 'false', 'False', 'FALSE', '0', 0, 0.0, False} def __init__(self, **kwargs): assert 'allow_null' not in kwargs, '`allow_null` is not a valid option. Use `NullBooleanField` instead.' @@ -634,9 +634,9 @@ class NullBooleanField(Field): 'invalid': _('"{input}" is not a valid boolean.') } initial = None - TRUE_VALUES = set(('t', 'T', 'true', 'True', 'TRUE', '1', 1, True)) - FALSE_VALUES = set(('f', 'F', 'false', 'False', 'FALSE', '0', 0, 0.0, False)) - NULL_VALUES = set(('n', 'N', 'null', 'Null', 'NULL', '', None)) + TRUE_VALUES = {'t', 'T', 'true', 'True', 'TRUE', '1', 1, True} + FALSE_VALUES = {'f', 'F', 'false', 'False', 'FALSE', '0', 0, 0.0, False} + NULL_VALUES = {'n', 'N', 'null', 'Null', 'NULL', '', None} def __init__(self, **kwargs): assert 'allow_null' not in kwargs, '`allow_null` is not a valid option.' @@ -1241,9 +1241,9 @@ class ChoiceField(Field): # Map the string representation of choices to the underlying value. # Allows us to deal with eg. integer choices while supporting either # integer or string input, but still get the correct datatype out. - self.choice_strings_to_values = dict([ - (six.text_type(key), key) for key in self.choices.keys() - ]) + self.choice_strings_to_values = { + six.text_type(key): key for key in self.choices.keys() + } self.allow_blank = kwargs.pop('allow_blank', False) @@ -1302,15 +1302,15 @@ class MultipleChoiceField(ChoiceField): if not self.allow_empty and len(data) == 0: self.fail('empty') - return set([ + return { super(MultipleChoiceField, self).to_internal_value(item) for item in data - ]) + } def to_representation(self, value): - return set([ + return { self.choice_strings_to_values.get(six.text_type(item), item) for item in value - ]) + } class FilePathField(ChoiceField): @@ -1508,19 +1508,19 @@ class DictField(Field): data = html.parse_html_dict(data) if not isinstance(data, dict): self.fail('not_a_dict', input_type=type(data).__name__) - return dict([ - (six.text_type(key), self.child.run_validation(value)) + return { + six.text_type(key): self.child.run_validation(value) for key, value in data.items() - ]) + } def to_representation(self, value): """ List of object instances -> List of dicts of primitive datatypes. """ - return dict([ - (six.text_type(key), self.child.to_representation(val)) + return { + six.text_type(key): self.child.to_representation(val) for key, val in value.items() - ]) + } class JSONField(Field): diff --git a/rest_framework/metadata.py b/rest_framework/metadata.py index aba1a2013..6c4f17692 100644 --- a/rest_framework/metadata.py +++ b/rest_framework/metadata.py @@ -77,7 +77,7 @@ class SimpleMetadata(BaseMetadata): the fields that are accepted for 'PUT' and 'POST' methods. """ actions = {} - for method in set(['PUT', 'POST']) & set(view.allowed_methods): + for method in {'PUT', 'POST'} & set(view.allowed_methods): view.request = clone_request(request, method) try: # Test global permissions diff --git a/rest_framework/pagination.py b/rest_framework/pagination.py index d82a755c8..45b5b29c5 100644 --- a/rest_framework/pagination.py +++ b/rest_framework/pagination.py @@ -79,11 +79,7 @@ def _get_displayed_page_numbers(current, final): # We always include the first two pages, last two pages, and # two pages either side of the current page. - included = set(( - 1, - current - 1, current, current + 1, - final - )) + included = {1, current - 1, current, current + 1, final} # If the break would only exclude a single page number then we # may as well include the page number instead of the break. diff --git a/rest_framework/routers.py b/rest_framework/routers.py index d4e9d95ed..39605923d 100644 --- a/rest_framework/routers.py +++ b/rest_framework/routers.py @@ -174,7 +174,7 @@ class SimpleRouter(BaseRouter): url_path = initkwargs.pop("url_path", None) or methodname ret.append(Route( url=replace_methodname(route.url, url_path), - mapping=dict((httpmethod, methodname) for httpmethod in httpmethods), + mapping={httpmethod: methodname for httpmethod in httpmethods}, name=replace_methodname(route.name, url_path), initkwargs=initkwargs, )) diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py index 5aef1df69..d505d8d3a 100644 --- a/rest_framework/serializers.py +++ b/rest_framework/serializers.py @@ -125,10 +125,10 @@ class BaseSerializer(Field): } if allow_empty is not None: list_kwargs['allow_empty'] = allow_empty - list_kwargs.update(dict([ - (key, value) for key, value in kwargs.items() + list_kwargs.update({ + key: value for key, value in kwargs.items() if key in LIST_SERIALIZER_KWARGS - ])) + }) meta = getattr(cls, 'Meta', None) list_serializer_class = getattr(meta, 'list_serializer_class', ListSerializer) return list_serializer_class(*args, **list_kwargs) @@ -305,10 +305,10 @@ def get_validation_error_detail(exc): elif isinstance(exc.detail, dict): # If errors may be a dict we use the standard {key: list of values}. # Here we ensure that all the values are *lists* of errors. - return dict([ - (key, value if isinstance(value, list) else [value]) + return { + key: value if isinstance(value, list) else [value] for key, value in exc.detail.items() - ]) + } elif isinstance(exc.detail, list): # Errors raised as a list are non-field errors. return { @@ -1237,13 +1237,10 @@ class ModelSerializer(Serializer): for model_field in model_fields.values(): # Include each of the `unique_for_*` field names. - unique_constraint_names |= set([ - model_field.unique_for_date, - model_field.unique_for_month, - model_field.unique_for_year - ]) + unique_constraint_names |= {model_field.unique_for_date, model_field.unique_for_month, + model_field.unique_for_year} - unique_constraint_names -= set([None]) + unique_constraint_names -= {None} # Include each of the `unique_together` field names, # so long as all the field names are included on the serializer. @@ -1357,10 +1354,10 @@ class ModelSerializer(Serializer): # which may map onto a model field. Any dotted field name lookups # cannot map to a field, and must be a traversal, so we're not # including those. - field_names = set([ + field_names = { field.source for field in self.fields.values() if (field.source != '*') and ('.' not in field.source) - ]) + } # Note that we make sure to check `unique_together` both on the # base model class, but also on any parent classes. diff --git a/rest_framework/validators.py b/rest_framework/validators.py index a1771a92e..a21f67e60 100644 --- a/rest_framework/validators.py +++ b/rest_framework/validators.py @@ -100,11 +100,11 @@ class UniqueTogetherValidator(object): if self.instance is not None: return - missing = dict([ - (field_name, self.missing_message) + missing = { + field_name: self.missing_message for field_name in self.fields if field_name not in attrs - ]) + } if missing: raise ValidationError(missing) @@ -120,10 +120,10 @@ class UniqueTogetherValidator(object): attrs[field_name] = getattr(self.instance, field_name) # Determine the filter keyword arguments and filter the queryset. - filter_kwargs = dict([ - (field_name, attrs[field_name]) + filter_kwargs = { + field_name: attrs[field_name] for field_name in self.fields - ]) + } return queryset.filter(**filter_kwargs) def exclude_current_instance(self, attrs, queryset): @@ -184,11 +184,11 @@ class BaseUniqueForValidator(object): The `UniqueForValidator` classes always force an implied 'required' state on the fields they are applied to. """ - missing = dict([ - (field_name, self.missing_message) + missing = { + field_name: self.missing_message for field_name in [self.field, self.date_field] if field_name not in attrs - ]) + } if missing: raise ValidationError(missing)