image.png
>>> from random import randint
>>> data = [randint(-10, 10) for _ in range(10)]
>>> data
[-8, 0, 0, -2, 10, 9, 0, 9, 6, -4]
>>> filter(lambda x: x >= 0, data)
<filter object at 0x000001E40E9A3DA0>
>>> list(filter(lambda x: x >= 0, data))
[0, 0, 10, 9, 0, 9, 6]
>>> [x for x in data if x >= 0]
[0, 0, 10, 9, 0, 9, 6]
>>> d = {x: randint(60, 100) for x in range(1, 21)}
>>> {k: v for k, v in d.items() if v >= 90}
{4: 91, 9: 90, 14: 97, 16: 96, 20: 99}
>>> s = set(data)
>>> s
{0, 6, 9, 10, -8, -4, -2}
>>> {x for x in s if x % 3 == 0}
{0, 9, 6}
image.png
>>> student = ('Jim', 16, 'male', 'jim123@qq.com')
>>> student[0] #name
'Jim'
>>> student[3] #mail
'jim123@qq.com'
>>> name, age, gender, mail = range(4)
>>> student[mail]
'jim123@qq.com'
>>> student[name]
'Jim'
>>> from collections import namedtuple
>>> student = namedtuple('Student', ['name', 'age', 'gender', 'mail'])
>>> s = student('Jim', 16, 'male', 'jim123@qq.com')
>>> s.index
<built-in method index of Student object at 0x0000020D7697E1A8>
>>> s.name
'Jim'
>>> s
Student(name='Jim', age=16, gender='male', mail='jim123@qq.com')
>>> s1 = student(name='Merry', age=16, gender='male', mail='Merry123@qq.com')
>>> s1.name
'Merry'
image.png
>>> from random import randint
>>> data = [randint(1, 10) for _ in range(30)]
>>> c = dict.fromkeys(data, 0)
>>> c
{2: 0, 4: 0, 7: 0, 1: 0, 6: 0, 10: 0, 8: 0, 3: 0, 9: 0}
>>> for i in data:
c[i] += 1
>>> c
{2: 5, 4: 4, 7: 5, 1: 3, 6: 4, 10: 2, 8: 2, 3: 4, 9: 1}
>>> from collections import Counter
>>> c1 = Counter(data)
>>> c1
Counter({2: 5, 7: 5, 4: 4, 6: 4, 3: 4, 1: 3, 10: 2, 8: 2, 9: 1})
>>> c1.most_common(3)
[(2, 5), (7, 5), (4, 4)]
>>> c3 = Counter(re.split('\W+', aticle))
>>> c3.most_common(3)
[('you', 14), ('your', 10), ('password', 7)]
image.png
>>> from random import randint
>>> {x: randint(60, 100) for x in 'xyzabcslfj'}
{'x': 97, 'y': 63, 'z': 87, 'a': 93, 'b': 89, 'c': 93, 's': 94, 'l': 76, 'f': 63, 'j': 85}
>>> d = {x: randint(60, 100) for x in 'xyzabcslfj'}
>>> sorted(d)
['a', 'b', 'c', 'f', 'j', 'l', 's', 'x', 'y', 'z']
>>> list(iter(d))
['x', 'y', 'z', 'a', 'b', 'c', 's', 'l', 'f', 'j']
>>> sorted(d.items(), key=lambda x: x[1])
[('s', 60), ('f', 62), ('x', 69), ('a', 69), ('y', 77), ('b', 78),
('z', 83), ('c', 84), ('l', 86), ('j', 90)]
>>> sorted(d.items(), key=lambda x: x[1], reverse=True)
[('j', 90), ('l', 86), ('c', 84), ('z', 83), ('b', 78), ('y', 77),
('x', 69), ('a', 69), ('f', 62), ('s', 60)]
image.png
>>> from random import randint, sample
>>> sample('abcdefg', 3)
['e', 'b', 'd']
>>> sample('abcdefg', randint(3, 6))
['b', 'd', 'c', 'e']
>>> d1 = {k: randint(1, 4) for k in sample('abcdefg', randint(3, 6))}
>>> d1
{'b': 1, 'd': 3, 'c': 2, 'f': 4, 'a': 1}
>>> d2 = {k: randint(1, 4) for k in sample('abcdefg', randint(3, 6))}
>>> d3 = {k: randint(1, 4) for k in sample('abcdefg', randint(3, 6))}
>>> d2
{'b': 1, 'g': 4, 'c': 3, 'd': 3}
>>> d3
{'a': 3, 'c': 3, 'd': 4, 'g': 2}
>>> [k for k in d1 if k in d2 and k in d3]
['d', 'c']
>>> d_list = [d1, d2, d3]
>>> [k for k in d_list[0] if all(map(lambda x : k in x, d_list[1:]))]
['d', 'c']
>>> d1.keys()
dict_keys(['b', 'd', 'c', 'f', 'a'])
>>> d1.keys() & d2.keys()
{'d', 'c', 'b'}
>>> from functools import reduce
>>> reduce(lambda a, b: a * b, range(1, 10))
362880
>>> list(map(dict.keys, d_list))
[dict_keys(['b', 'd', 'c', 'f', 'a']), dict_keys(['b', 'g', 'c', 'd']), dict_keys(['a', 'c', 'd', 'g'])]
>>> reduce(lambda a, b: a&b, list(map(dict.keys, d_list)))
{'d', 'c'}
image.png
>>> from collections import OrderedDict
>>> d = OrderedDict()
>>> d['Jim'] = (1, 24)
>>> d['Bob'] = (2, 30)
>>> d['Merry'] = (3, 35)
>>> d
OrderedDict([('Jim', (1, 24)), ('Bob', (2, 30)), ('Merry', (3, 35))])
>>> for i in d:
print(i)
Jim
Bob
Merry
>>> player = list('ABCDEFGHI')
>>> for i in range(len(player)):
input()
p = choice(player)
player.remove(p)
print(p, i+1, time()-start_time)
d[p] = (i+1, time()-start_time)
OrderedDict([('I', (1, 1533718954.1411808)),
('A', (2, 1533718954.7458303)),
('D', (3, 1533718955.2383544)),
('F', (4, 1533718955.6509078))])
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