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