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Refactor: Replace try/except with contextlib.suppress() (#8676)

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Ahzam Ahmed 2022-10-05 15:02:00 +05:00 committed by GitHub
parent 99cf2c415f
commit c10f226622
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8 changed files with 31 additions and 54 deletions
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20
rest_framework/fields.py
View File

@ -1,3 +1,4 @@
import contextlib
import copy
import datetime
import decimal
@ -690,15 +691,13 @@ class BooleanField(Field):
NULL_VALUES = {'null', 'Null', 'NULL', '', None}
def to_internal_value(self, data):
try:
with contextlib.suppress(TypeError):
if data in self.TRUE_VALUES:
return True
elif data in self.FALSE_VALUES:
return False
elif data in self.NULL_VALUES and self.allow_null:
return None
except TypeError: # Input is an unhashable type
pass
self.fail('invalid', input=data)
def to_representation(self, value):
@ -1158,19 +1157,14 @@ class DateTimeField(Field):
return self.enforce_timezone(value)
for input_format in input_formats:
if input_format.lower() == ISO_8601:
try:
with contextlib.suppress(ValueError, TypeError):
if input_format.lower() == ISO_8601:
parsed = parse_datetime(value)
if parsed is not None:
return self.enforce_timezone(parsed)
except (ValueError, TypeError):
pass
else:
try:
parsed = self.datetime_parser(value, input_format)
return self.enforce_timezone(parsed)
except (ValueError, TypeError):
pass
parsed = self.datetime_parser(value, input_format)
return self.enforce_timezone(parsed)
humanized_format = humanize_datetime.datetime_formats(input_formats)
self.fail('invalid', format=humanized_format)

17
rest_framework/pagination.py
View File

@ -2,6 +2,8 @@
Pagination serializers determine the structure of the output that should
be used for paginated responses.
"""
import contextlib
from base64 import b64decode, b64encode
from collections import OrderedDict, namedtuple
from urllib import parse
@ -257,15 +259,12 @@ class PageNumberPagination(BasePagination):
def get_page_size(self, request):
if self.page_size_query_param:
try:
with contextlib.suppress(KeyError, ValueError):
return _positive_int(
request.query_params[self.page_size_query_param],
strict=True,
cutoff=self.max_page_size
)
except (KeyError, ValueError):
pass
return self.page_size
def get_next_link(self):
@ -430,15 +429,12 @@ class LimitOffsetPagination(BasePagination):
def get_limit(self, request):
if self.limit_query_param:
try:
with contextlib.suppress(KeyError, ValueError):
return _positive_int(
request.query_params[self.limit_query_param],
strict=True,
cutoff=self.max_limit
)
except (KeyError, ValueError):
pass
return self.default_limit
def get_offset(self, request):
@ -680,15 +676,12 @@ class CursorPagination(BasePagination):
def get_page_size(self, request):
if self.page_size_query_param:
try:
with contextlib.suppress(KeyError, ValueError):
return _positive_int(
request.query_params[self.page_size_query_param],
strict=True,
cutoff=self.max_page_size
)
except (KeyError, ValueError):
pass
return self.page_size
def get_next_link(self):

13
rest_framework/parsers.py
View File

@ -4,7 +4,9 @@ Parsers are used to parse the content of incoming HTTP requests.
They give us a generic way of being able to handle various media types
on the request, such as form content or json encoded data.
"""
import codecs
import contextlib
from django.conf import settings
from django.core.files.uploadhandler import StopFutureHandlers
@ -193,17 +195,12 @@ class FileUploadParser(BaseParser):
Detects the uploaded file name. First searches a 'filename' url kwarg.
Then tries to parse Content-Disposition header.
"""
try:
with contextlib.suppress(KeyError):
return parser_context['kwargs']['filename']
except KeyError:
pass
try:
with contextlib.suppress(AttributeError, KeyError, ValueError):
meta = parser_context['request'].META
disposition, params = parse_header_parameters(meta['HTTP_CONTENT_DISPOSITION'])
if 'filename*' in params:
return params['filename*']
else:
return params['filename']
except (AttributeError, KeyError, ValueError):
pass
return params['filename']

6
rest_framework/relations.py
View File

@ -1,3 +1,4 @@
import contextlib
import sys
from collections import OrderedDict
from urllib import parse
@ -170,7 +171,7 @@ class RelatedField(Field):
def get_attribute(self, instance):
if self.use_pk_only_optimization() and self.source_attrs:
# Optimized case, return a mock object only containing the pk attribute.
try:
with contextlib.suppress(AttributeError):
attribute_instance = get_attribute(instance, self.source_attrs[:-1])
value = attribute_instance.serializable_value(self.source_attrs[-1])
if is_simple_callable(value):
@ -183,9 +184,6 @@ class RelatedField(Field):
value = getattr(value, 'pk', value)
return PKOnlyObject(pk=value)
except AttributeError:
pass
# Standard case, return the object instance.
return super().get_attribute(instance)

12
rest_framework/renderers.py
View File

@ -6,7 +6,9 @@ on the response, such as JSON encoded data or HTML output.
REST framework also provides an HTML renderer that renders the browsable API.
"""
import base64
import contextlib
from collections import OrderedDict
from urllib import parse
@ -72,11 +74,8 @@ class JSONRenderer(BaseRenderer):
# then pretty print the result.
# Note that we coerce `indent=0` into `indent=None`.
base_media_type, params = parse_header_parameters(accepted_media_type)
try:
with contextlib.suppress(KeyError, ValueError, TypeError):
return zero_as_none(max(min(int(params['indent']), 8), 0))
except (KeyError, ValueError, TypeError):
pass
# If 'indent' is provided in the context, then pretty print the result.
# E.g. If we're being called by the BrowsableAPIRenderer.
return renderer_context.get('indent', None)
@ -488,11 +487,8 @@ class BrowsableAPIRenderer(BaseRenderer):
return
if existing_serializer is not None:
try:
with contextlib.suppress(TypeError):
return self.render_form_for_serializer(existing_serializer)
except TypeError:
pass
if has_serializer:
if method in ('PUT', 'PATCH'):
serializer = view.get_serializer(instance=instance, **kwargs)

6
rest_framework/serializers.py
View File

@ -10,6 +10,8 @@ python primitives.
2. The process of marshalling between python primitives and request and
response content is handled by parsers and renderers.
"""
import contextlib
import copy
import inspect
import traceback
@ -1496,12 +1498,10 @@ class ModelSerializer(Serializer):
# they can't be nested attribute lookups.
continue
try:
with contextlib.suppress(FieldDoesNotExist):
field = model._meta.get_field(source)
if isinstance(field, DjangoModelField):
model_fields[source] = field
except FieldDoesNotExist:
pass
return model_fields

6
rest_framework/utils/encoders.py
View File

@ -1,6 +1,8 @@
"""
Helper classes for parsers.
"""
import contextlib
import datetime
import decimal
import json # noqa
@ -58,10 +60,8 @@ class JSONEncoder(json.JSONEncoder):
)
elif hasattr(obj, '__getitem__'):
cls = (list if isinstance(obj, (list, tuple)) else dict)
try:
with contextlib.suppress(Exception):
return cls(obj)
except Exception:
pass
elif hasattr(obj, '__iter__'):
return tuple(item for item in obj)
return super().default(obj)

5
rest_framework/utils/serializer_helpers.py
View File

@ -1,3 +1,4 @@
import contextlib
import sys
from collections import OrderedDict
from collections.abc import Mapping, MutableMapping
@ -103,15 +104,13 @@ class JSONBoundField(BoundField):
# When HTML form input is used and the input is not valid
# value will be a JSONString, rather than a JSON primitive.
if not getattr(value, 'is_json_string', False):
try:
with contextlib.suppress(TypeError, ValueError):
value = json.dumps(
self.value,
sort_keys=True,
indent=4,
separators=(',', ': '),
)
except (TypeError, ValueError):
pass
return self.__class__(self._field, value, self.errors, self._prefix)