发布于 2016-03-26 10:25:59 | 161 次阅读 | 评论: 0 | 来源: 网友投递
这里有新鲜出炉的Python3 Cookbook中文版,程序狗速度看过来!
Python编程语言
Python 是一种面向对象、解释型计算机程序设计语言,由Guido van Rossum于1989年底发明,第一个公开发行版发行于1991年。Python语法简洁而清晰,具有丰富和强大的类库。它常被昵称为胶水语言,它能够把用其他语言制作的各种模块(尤其是C/C++)很轻松地联结在一起。
Python有四种类型的数字:
1.整型
a = 2
print a
2.长整型
b = 123456789
print b
3.浮点数
c = 3.2E2
print c
4.复数 复数为实数的推广,它使任一多项式都有根。复数当中有个“虚数单位”j,它是-1的一个平方根。任一复数都可表达为x+yj,其中x及y皆为实数,分别称为复数之“实部”和“虚部”。
d = (2+3j)
print d
计算示例:
每种程序语言都有数学计算方法,数学符号通用,大家都知道。直接上代码吧:
print "I will now count my chickens:"
print "Hens", 25 + 30 / 6
print "Roosters", 100 - 25 * 3 % 4
print "Now I will count the eggs:"
print 3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6
print "Is it true that 3 + 2 < 5 - 7?"
print 3 + 2 < 5 - 7
print "What is 3 + 2?", 3 + 2
print "What is 5 - 7?", 5 - 7
print "Oh, that's why it's False."
print "How about some more."
print "Is it greater?", 5 > -2
print "Is it greatet or equal?", 5 >= -2
print "is it less or equal?", 5 <= -2
运行结果应该是这样的:
root@he-desktop:~/mystuff# python ex3.py
I will now count my chickens:
Hens 30
Roosters 97
Now I will count the eggs:
7
Is it true that 3 + 2 < 5 - 7?
False
What is 3 + 2? 5
What is 5 - 7? -2
Oh, that's why it's False.
How about some more.
Is it greater? True
Is it greatet or equal? True
is it less or equal? False
eg:用数学计算把英寸和磅转化为厘米和千克。
1英寸 = 2.54厘米,1磅 = 0.4536千克
my_height_centimeter = my_height * 2.54
my_weight_kilo = my_weight * 0.4536
print "He's %d centimeters tall." % my_height_centimeter
print "He's %d kilos heavy." % my_weight_kilo