英文原文：Max Burstein，编译：伯乐在线 –刘志军
以下是我近些年收集的一些Python实用技巧和工具，希望能对你有所帮助。
x = 6 y = 5 x, y = y, x print x >>> 5 print y >>> 6
print "Hello" if True else "World" >>> Hello
连接 下面的最后一种方式在绑定两个不同类型的对象时显得很cool。
nfc = ["Packers", "49ers"] afc = ["Ravens", "Patriots"] print nfc + afc >>> ['Packers', '49ers', 'Ravens', 'Patriots'] print str(1) + " world" >>> 1 world print `1` + " world" >>> 1 world print 1, "world" >>> 1 world print nfc, 1 >>> ['Packers', '49ers'] 1
#除后向下取整 print 5.0//2 >>> 2 # 2的5次方 print 2**5 >> 32
x = 2 if 3 > x > 1: print x >>> 2 if 1 < x > 0: print x >>> 2
nfc = ["Packers", "49ers"] afc = ["Ravens", "Patriots"] for teama, teamb in zip(nfc, afc): print teama + " vs. " + teamb >>> Packers vs. Ravens >>> 49ers vs. Patriots
teams = ["Packers", "49ers", "Ravens", "Patriots"] for index, team in enumerate(teams): print index, team >>> 0 Packers >>> 1 49ers >>> 2 Ravens >>> 3 Patriots
列表推导式 已知一个列表，我们可以刷选出偶数列表方法：
numbers = [1,2,3,4,5,6] even = [] for number in numbers: if number%2 == 0: even.append(number) #转变成如下： numbers = [1,2,3,4,5,6] even = [number for number in numbers if number%2 == 0]
teams = ["Packers", "49ers", "Ravens", "Patriots"] print {key: value for value, key in enumerate(teams)} >>> {'49ers': 1, 'Ravens': 2, 'Patriots': 3, 'Packers': 0}
items = [0]*3 print items >>> [0,0,0]
teams = ["Packers", "49ers", "Ravens", "Patriots"] print ", ".join(teams) >>> 'Packers, 49ers, Ravens, Patriots'
x = [1,2,3,4,5,6] #前3个 print x[:3] >>> [1,2,3] #中间4个 print x[1:5] >>> [2,3,4,5] #最后3个 print x[-3:] >>> [4,5,6] #奇数项 print x[::2] >>> [1,3,5] #偶数项 print x[1::2] >>> [2,4,6]
from collections import Counter print Counter("hello") >>> Counter({'l': 2, 'h': 1, 'e': 1, 'o': 1})
from itertools import combinations teams = ["Packers", "49ers", "Ravens", "Patriots"] for game in combinations(teams, 2): print game >>> ('Packers', '49ers') >>> ('Packers', 'Ravens') >>> ('Packers', 'Patriots') >>> ('49ers', 'Ravens') >>> ('49ers', 'Patriots') >>> ('Ravens', 'Patriots')
False == True 在python中，True和False是全局变量，因此：
False = True if False: print "Hello" else: print "World" >>> Hello
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