Python的range()
函数原型：range（start， end， scan):参数含义：start:计数从start开始。默认是从0开始。例如range（5）等价于range（0， 5）;
end:技术到end结束，但不包括end.例如：range（0， 5） 是没有5
scan：每次跳跃的间距，默认为1。例如：range（0， 5） 等价于 range(0, 5, 1)
range的类型：Python 2.x range() produced a list, and xrange() returned an iterator - a sequence object. in Python 3.x, the range() function got its own type.
有趣的用法： 倒序 for i in range(99,0,-1):
浮点数的range：
>>> # Note: All arguments are required.
>>> # We're not fancy enough to implement all.
>>> def frange(start, stop, step):
... i = start
... while i < stop:
... yield i
... i += step
...
>>> for i in frange(0.5, 1.0, 0.1):
... print(i)
...
0.5
0.6
0.7
0.8
0.9
1.0
求最大公约数，最小公倍数： （5-15.py)
def maxpub(a,b):
a = int(a)
b = int(b)
if a>=b:
small = b
large = a
else:
small = a
large = b
pub = 1
#should include small in range
#range(2,small+1)
for i in range(2,small+1):
i = i
if (small%i==0 and large%i == 0):
pub = pub * i
small = small/i
large = large/i
continue
else:
i = i + 1
return pub
def smallpub(a,b):
a = int(a)
b = int(b)
return a*b/maxpub(a,b)
http://www.pythoncentral.io/pythons-range-function-explained/
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