Python的幾個高階程式設計技巧

python有一些技巧對你來說是新知識，但是還有一些技巧會讓你的**效率大幅提公升。

a=[1,2,3]

[x*x for x in a if x>1]

[4, 9]

a=[1,2,3]

s = 
s

type(s)

set

a=[1,2,3]

list(range(10))

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

list(range(3,10))

[3, 4, 5, 6, 7, 8, 9]

list(filter(lambda x:x%3==0, range(10)))

[0, 3, 6, 9]

from collections import namedtuple

point = namedtuple('point', ['x', 'y'])
p = point(11, 22)

p.x

11

p.y

22

from random import randint

randint(1,10)

1

from collections import counter

c = counter('aaabbbbccccccddddddeeeeee')

c

counter()

c.most_common(3)

[('c', 6), ('d', 6), ('e', 6)]

from random import randint

keys = 'abcdefg'
d =

d

d.items()

dict_items([('a', 90), ('b', 98), ('c', 100), ('d', 97), ('e', 95), ('f', 93), ('g', 92)])

sorted(d.items(), key=lambda x : x[1])

[('a', 90), ('g', 92), ('f', 93), ('e', 95), ('d', 97), ('b', 98), ('c', 100)]

from random import randint, sample

dd1 = 
dd2 = 
dd3 =

dd1

dd2

dd3

mp = map(dict.keys, (dd1, dd2, dd3))

list(mp)

[dict_keys(['h', 'f', 'c', 'i', 'b']),

dict_keys(['b', 'g', 'h', 'f', 'd']),
dict_keys(['h', 'g', 'a', 'd', 'i'])]

from functools import reduce

reduce(lambda x,y: x&y, mp)

from collections import ordereddict

d = ordereddict()
d['x'] = 1
d['y'] = 2
d['a'] = 2
d['b'] = 2
d

ordereddict([('x', 1), ('y', 2), ('a', 2), ('b', 2)])

from collections import deque

d = deque(, 3)
d

deque([2, 3, 4])

names = [x for x in 'abcdefg']

ages = [x for x in range(21, 28)]
scores = [randint(90,100) for x in range(7)]

for name,age,score in zip(names, ages, scores):

print(name,age,score)

a 21 95

b 22 99
c 23 94
d 24 95
e 25 100
f 26 96
g 27 95

lista = (randint(1,10) for x in range(10))

listb = [randint(90,100) for x in range(20)]

from itertools import chain

for x in chain(lista, listb):

print(x, end=',')

5,10,3,1,8,7,6,5,6,8,92,95,91,98,95,93,96,95,94,98,92,90,91,91,99,96,90,100,94,99,

s = 'a,b;c/d'

import re
re.sub(r'[,;/]', '-', s)

'a-b-c-d'

print('\t'.join([str(x) for x in ['a','b',33,4.0,'e']]))

a	b	33	4.0	e

from threading import thread

def func(x):
print(x, x*x*x)
ts = 
for x in range(10):
t = thread(target=func, args=(x,))
t.start()
for t in ts:
t.join()
print('main thread over')

0 0

1 12 8
3 27
4 64
5 125
6 216
7 343
8 512
9 729
main thread over

from threading import thread

class mythread(thread):
def __init__(self, x):
thread.__init__(self)
self.x = x
def run(self):
print(self.x, self.x*self.x*self.x)
ts = 
for x in range(10):
t = mythread(x)
t.start()
for t in ts:
t.join()
print('main thread over')

0 0

1 12 3 27
845 64
6 216
1257 343
8 512
9 729
main thread over

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