valmap valfilter(predicate, d, factory=dict) Filter items in dictionary by value >>> iseven = lambda x: x % 2 == 0 >>> d = {1: 2, 2: 3, 3: 4, 4: 5} >>> valfilter(iseven, d) {1: 2, 3: 4} 5.10. API 269 itemfilter valmap keyfilter(predicate, d, factory=dict) Filter items in dictionary by key >>> iseven = lambda x: x % 2 == 0 >>> d = {1: 2, 2: 3, 3: 4, 4: 5} >>> keyfilter(iseven, d) {2: 3, 4: 5} See also: dictionaries to the depth specified by the keys, with the innermost value set to func(default). >>> inc = lambda x: x + 1 >>> update_in({'a': 0}, ['a'], inc) {'a': 1} >>> transaction = {'name': 'Alice', ... 'purchase':

d.get('a') (1, 1, 1) >>> d.b = 2 >>> d.b, d['b'] (2, 2) first(seq, key=bool, default=None, apply=lambda x: ...) Give the first value that satisfies the key test. Parameters • seq (iterable) -- • key first([1, 1, 3, 4, 5], key=lambda x: x % 2 == 0) 4 firstitem(map, key=lambda k, v: ..., default=None, apply=lambda k, v: ...) last(seq, key=bool, default=None, apply=lambda x: ...) call_each(seq) Calls Car(Entity): ... weight = NumberField(required=False) ... wheels = IntField(default=4, validation=lambda x: 3 <= x <= 4) ... color = EnumField(Color) >>> # create a new car object >>> car = Car(color=Color

d.get('a') (1, 1, 1) >>> d.b = 2 >>> d.b, d['b'] (2, 2) first(seq, key=bool, default=None, apply=lambda x: ...) Give the first value that satisfies the key test. Parameters • seq (iterable) -- • key first([1, 1, 3, 4, 5], key=lambda x: x % 2 == 0) 4 firstitem(map, key=lambda k, v: ..., default=None, apply=lambda k, v: ...) last(seq, key=bool, default=None, apply=lambda x: ...) call_each(seq) Calls Car(Entity): ... weight = NumberField(required=False) ... wheels = IntField(default=4, validation=lambda x: 3 <= x <= 4) ... color = EnumField(Color) >>> # create a new car object >>> car = Car(color=Color

d.get('a') (1, 1, 1) >>> d.b = 2 >>> d.b, d['b'] (2, 2) first(seq, key=bool, default=None, apply=lambda x: ...) Give the first value that satisfies the key test. Parameters • seq (iterable) -- • key first([1, 1, 3, 4, 5], key=lambda x: x % 2 == 0) 4 firstitem(map, key=lambda k, v: ..., default=None, apply=lambda k, v: ...) last(seq, key=bool, default=None, apply=lambda x: ...) call_each(seq) Calls Car(Entity): ... weight = NumberField(required=False) ... wheels = IntField(default=4, validation=lambda x: 3 <= x <= 4) ... color = EnumField(Color) >>> # create a new car object >>> car = Car(color=Color

d.get('a') (1, 1, 1) >>> d.b = 2 >>> d.b, d['b'] (2, 2) first(seq, key=bool, default=None, apply=lambda x: ...) Give the first value that satisfies the key test. Parameters • seq (iterable) -- • key first([1, 1, 3, 4, 5], key=lambda x: x % 2 == 0) 4 firstitem(map, key=lambda k, v: ..., default=None, apply=lambda k, v: ...) last(seq, key=bool, default=None, apply=lambda x: ...) call_each(seq) Calls Car(Entity): ... weight = NumberField(required=False) ... wheels = IntField(default=4, validation=lambda x: 3 <= x <= 4) ... color = EnumField(Color) >>> # create a new car object >>> car = Car(color=Color

d.get('a') (1, 1, 1) >>> d.b = 2 >>> d.b, d['b'] (2, 2) first(seq, key=bool, default=None, apply=lambda x: ...) Give the first value that satisfies the key test. Parameters • seq (iterable) • key (callable) first([1, 1, 3, 4, 5], key=lambda x: x % 2 == 0) 4 firstitem(map, key=lambda k, v: ..., default=None, apply=lambda k, v: ...) last(seq, key=bool, default=None, apply=lambda x: ...) call_each(seq) Calls Car(Entity): ... weight = NumberField(required=False) ... wheels = IntField(default=4, validation=lambda x: 3 <= x <= 4) ... color = EnumField(Color) >>> # create a new car object >>> car = Car(color=Color

d.get('a') (1, 1, 1) >>> d.b = 2 >>> d.b, d['b'] (2, 2) first(seq, key=bool, default=None, apply=lambda x: ...) Give the first value that satisfies the key test. Parameters • seq (iterable) • key (callable) first([1, 1, 3, 4, 5], key=lambda x: x % 2 == 0) 4 firstitem(map, key=lambda k, v: ..., default=None, apply=lambda k, v: ...) last(seq, key=bool, default=None, apply=lambda x: ...) call_each(seq) Calls Car(Entity): ... weight = NumberField(required=False) ... wheels = IntField(default=4, validation=lambda x: 3 <= x <= 4) ... color = EnumField(Color) >>> # create a new car object >>> car = Car(color=Color

d.get('a') (1, 1, 1) >>> d.b = 2 >>> d.b, d['b'] (2, 2) first(seq, key=bool, default=None, apply=lambda x: ...) Give the first value that satisfies the key test. Parameters • seq (iterable) • key (callable) first([1, 1, 3, 4, 5], key=lambda x: x % 2 == 0) 4 firstitem(map, key=lambda k, v: ..., default=None, apply=lambda k, v: ...) last(seq, key=bool, default=None, apply=lambda x: ...) call_each(seq) Calls Car(Entity): ... weight = NumberField(required=False) ... wheels = IntField(default=4, validation=lambda x: 3 <= x <= 4) ... color = EnumField(Color) >>> # create a new car object >>> car = Car(color=Color

d.get('a') (1, 1, 1) >>> d.b = 2 >>> d.b, d['b'] (2, 2) first(seq, key=bool, default=None, apply=lambda x: ...) Give the first value that satisfies the key test. Parameters • seq (iterable) -- • key first([1, 1, 3, 4, 5], key=lambda x: x % 2 == 0) 4 firstitem(map, key=lambda k, v: ..., default=None, apply=lambda k, v: ...) last(seq, key=bool, default=None, apply=lambda x: ...) call_each(seq) Calls Car(Entity): ... weight = NumberField(required=False) ... wheels = IntField(default=4, validation=lambda x: 3 <= x <= 4) ... color = EnumField(Color) >>> # create a new car object >>> car = Car(color=Color

Initialize self. See help(type(self)) for accurate signature. first(seq, key=bool, default=None, apply=lambda x: ...) Give the first value that satisfies the key test. Parameters • seq (iterable) • key (callable) be in keyword form. For example: >>> first([1, 1, 3, 4, 5], key=lambda x: x % 2 == 0) 4 last(seq, key=bool, default=None, apply=lambda x: ...) compat 432 Chapter 4. Contributors welcome conda, Release Car(Entity): ... weight = NumberField(required=False) ... wheels = IntField(default=4, validation=lambda x: 3 <= x <= 4) ... color = EnumField(Color) >>> # create a new car object >>> car = Car(color=Color