add type to Field

docs/changelog.rst

@@ -10,6 +10,7 @@ New features
 ~~~~~~~~~~~~
 
 - 新增 ``request_ignored`` 事件
+- Field添加 ``type`` 参数，表示该字段的类型，在获取该字段的值时会进行类型转换
 
 0.10.1 (2018-07-18)
 -------------------

tests/test_item.py

@@ -32,3 +32,25 @@ def test_item():
     assert item['f2'] == 'new_v2'
     repr_str = repr(item)
     assert repr_str == "{'f1': 'v1', 'f2': 'new_v2'}" or repr_str == "{'f2': 'new_v2', 'f1': 'v1'}"
+
+
+class FieldTypeItem(Item):
+    none_field = Field()
+    str_field = Field(type='str')
+    int_field = Field(type='int')
+    float_field = Field(type='float')
+    bool_field = Field(type='bool')
+    func_field = Field(type=int)
+    error_field = Field(type='error type')
+
+
+def test_field_type():
+    item = FieldTypeItem(str_field=1, int_field='1', float_field='1', bool_field='1', func_field='1', error_field='1')
+    assert item['none_field'] is None
+    assert item['str_field'] == '1'
+    assert isinstance(item['int_field'], int) and item['int_field'] == 1
+    assert isinstance(item['float_field'], float) and item['float_field'] == 1
+    assert item['bool_field'] is True
+    assert isinstance(item['func_field'], int) and item['func_field'] == 1
+    with pytest.raises(ValueError):
+        print(item['error_field'])

xpaw/item.py

@@ -2,6 +2,8 @@
 
 from collections import MutableMapping
 
+from . import config
+
 
 class BaseItem:
     """
@@ -29,7 +31,23 @@ def __init__(self, **kwargs):
     def __getitem__(self, key):
         if key not in self:
             return None
-        return self.values[key]
+        v = self.values[key]
+        t = self.fields[key].get('type')
+        if t:
+            if isinstance(t, str):
+                if t == 'str':
+                    v = str(v)
+                elif t == 'int':
+                    v = config.getint(v)
+                elif t == 'float':
+                    v = config.getfloat(v)
+                elif t == 'bool':
+                    v = config.getbool(v)
+                else:
+                    raise ValueError('Unsupported item filed type: {}'.format(t))
+            else:
+                v = t(v)
+        return v
 
     def __contains__(self, name):
         return name in self.values